Paper Wasp — Fact Sheet

Scientific names: Polistes carolina (red paper wasp), P. exclamans (Guinea paper wasp), P. metricus (metric paper wasp), P. dominula (European paper wasp — invasive), P. fuscatus (northern paper wasp), P. apachus (Apache paper wasp) Common names: Paper wasp, umbrella wasp Family: Vespidae (subfamily Polistinae) Status in the San Antonio / Boerne corridor: Native (multiple species), extremely common, the #1 stinging insect call in the region

At a glance

Identification

Paper wasps are what most people picture when they say "wasp." The body is long and slender, the waist is exaggeratedly narrow, and the legs dangle below the body in flight in a way that no bee does. Flight is slower and more deliberate than a yellowjacket's sharp, darting movement.

The nest is the fastest ID in the field: a single comb of open hexagonal cells hanging upside-down from a central stalk attached to something overhead. No paper envelope, no enclosed football-shape — the cells are visible from below. If you can see the cells looking up at it, it's a paper wasp.

Multiple species live together in the San Antonio area, and locals often call them different things:

• Red wasp (Polistes carolina) — solid reddish-brown body, smoky dark wings. The dominant paper wasp in the region and probably 60–70% of all "paper wasp" encounters here.
• Red wasp (alternate: P. perplexus) — similar but less common
• Guinea paper wasp (P. exclamans) — smaller, with yellow markings, often on exposed structures
• Apache paper wasp (P. apachus) — a large yellow-and-brown species common in the western half of Texas
• Metric paper wasp (P. metricus) — stockier, darker, often in concealed locations
• European paper wasp (P. dominula) — invasive, yellow-and-black, somewhat yellowjacket-like, established in Texas in recent decades

Biology and behavior

Colony founding — the "foundress" year

Paper wasps go through a full annual cycle. In Central Texas, fertilized females (foundresses) emerge from winter hideouts in February or March, sometimes earlier in mild winters. A foundress finds a suitable site, starts a new nest, and lays eggs.

There are two strategies:

• Haplometrosis — a single foundress starts a nest alone. This is the default strategy for most Polistes species, including P. metricus and many others in Texas.
• Pleometrosis — multiple foundresses (sometimes sisters from last year's nest) cooperate to start a nest. This happens in P. carolina and is well-documented in P. dominula.

When multiple foundresses cooperate, they form a linear dominance hierarchy — a clear social pecking order. The dominant foundress (the "alpha" queen) does most of the egg-laying and stays on the nest. Subordinate foundresses do more foraging and take on more risk. Over the course of the season, as workers emerge and take over most of the foraging, the dominant queen's reproductive monopoly solidifies.

Life cycle through the year

In the San Antonio area:

• Feb–March: Foundresses emerge from overwintering, locate nest sites, begin building.
• April–May: First-brood larvae develop. Queen feeds them chewed caterpillars and other soft-bodied prey.
• Late May–June: First workers emerge. These are non-reproductive daughters of the foundress. They take over foraging, building, and brood care. Nest grows rapidly.
• July–August: Colony at full size. Most defensive phase of the year. Largest stinging-incident risk.
• September: Reproductive cells produced. New queens (future foundresses) and males develop.
• October–November: New queens mate. Males die. Old foundress and remaining workers die as temperatures drop.
• Late October onward: Mated new queens seek overwintering sites — attics, behind shutters, in siding gaps, rolled-up patio umbrellas, outdoor storage.

The old nest is never reused. This matters for treatment: killing the colony in September does not prevent next year's nest — new queens are already overwintering elsewhere and will build fresh nests the following spring in different locations.

Food and ecological role

Adult paper wasps drink nectar. The larvae, however, are raised on animal protein — specifically caterpillars and other soft-bodied insect prey that the workers hunt, chew up, and deliver to the nest. A healthy paper wasp colony is a legitimately significant caterpillar-control agent in a garden, taking hundreds of tomato hornworms, cabbage loopers, and other crop pests over a season.

This is why agricultural extension services — including Texas A&M AgriLife — specifically recommend not killing paper wasp nests that are located far from human activity. They are beneficial predators when they're not in your doorframe.

Honey storage — a Polistes secret weapon for Texas

Here's a specifically regional biology note: Polistes annularis, a paper wasp studied in Texas, stores small amounts of honey in a few cells of the nest. Joan Strassmann's 1979 paper in Science was titled exactly what it documented — "Honey caches help female paper wasps survive Texas winters."

Most paper wasp species don't do this. P. annularis is unusual in storing nectar inside the nest to help the colony (particularly the foundress) survive brief cold snaps during the winter-start period of the cycle. It's a small but clever adaptation to the marginal, unpredictable winters typical of Central and South Texas.

Paper wasps recognize individual faces

This is one of the most remarkable findings in invertebrate cognition research, and it's specifically about paper wasps.

Research by Elizabeth Tibbetts and Michael Sheehan at the University of Michigan, published in Science in 2011 and in Proceedings of the Royal Society B in 2021, established that **the northern paper wasp (Polistes fuscatus) can recognize individual faces of other paper wasps, and they do it using holistic face processing** — the same cognitive mechanism primates (including humans) use for face recognition.

Key findings from the research:

• P. fuscatus wasps can be trained to discriminate between different wasp face images faster and more accurately than non-face images.
• They use holistic processing — the whole face is recognized as more than the sum of its parts, just like in humans.
• Closely related species (P. dominula, P. metricus) that don't have individual recognition in nature cannot be trained to do this, even though they have similar visual capacity.
• P. fuscatus wasps have robust long-term social memories — they can remember individuals for at least a week after one encounter.
• The face recognition is chromatic-dependent — grayscale wasp face images don't work, because the yellow, brown, and black color patterning carries the identity information.

The evolutionary hypothesis is that P. fuscatus specifically needs this ability because multiple foundresses compete for dominance during colony founding, and knowing who has already beaten whom (and therefore who outranks whom) stabilizes the dominance hierarchy. It's like a boarding school pecking order — everyone remembers who lost the fight last week, and that saves everyone from fighting again.

Paper wasp brains are less than one millionth the size of human brains. They have accomplished specialized face recognition anyway.

Polistes fuscatus is present in the eastern half of Texas but is not the dominant local species — red paper wasp (P. carolina) dominates Central Texas. The face-recognition ability is specific to fuscatus, but it's a good reminder that the colony in your eave is a more cognitively sophisticated animal than most homeowners assume.

Local context — San Antonio and the Hill Country

Paper wasps are by a wide margin the single most common stinging insect call we receive in the corridor from San Antonio to Boerne to Kerrville. Every home gets at least one visit per season. Many Hill Country homes with extensive outdoor living spaces get multiple nests a summer.

Where they build, by property type:

• Boerne historic district / Main Street (Hauptstrasse): Every eave along the downtown corridor. Limestone buildings with deep-shaded eaves are ideal sites.
• Fair Oaks Ranch and Dominion custom homes: Covered porches, outdoor kitchens, pergola cross-beams, pool cabanas.
• Stone Oak / Cibolo Canyons: Patio umbrellas (rolled up ones especially — that's where next year's queens overwinter), playset canopies, outdoor bars.
• Bulverde / Spring Branch / acreage properties: Barns, sheds, pole buildings — multiple nests per structure is typical.
• New Braunfels / Gruene: Historic building eaves, outdoor venue pergolas, live-music patios.

A note on which species to expect locally

• **Red paper wasp (P. carolina)** dominates from San Antonio northwest through Boerne and Fair Oaks Ranch. This is the species that concealed nests — inside attic vents, in gable louvers, behind shutters, inside wall voids — far more than the others.
• **Guinea paper wasp (P. exclamans)** is the exposed-location specialist: hanging nests from eaves and soffits that you can see from the ground.
• **Apache paper wasp (P. apachus)** shows up more in the western part of the territory — Kerrville, Comfort, Fredericksburg.
• **European paper wasp (P. dominula)** is genuinely invasive and has been moving through Texas. Worth noting separately because it often nests in unusual spots (inside metal tubing, in ground cavities) that native paper wasps ignore.

Risk to humans and pets

Moderate. A single paper wasp sting is painful (the Schmidt pain index rates paper wasps at 3.0 out of 4 — Justin Schmidt, who literally got stung by every wasp he could find for science, described a paper wasp sting as "caustic and burning, with a distinctly bitter aftertaste... Like spilling a beaker of hydrochloric acid on a paper cut"). It is very rarely fatal except in allergic individuals.

The higher-risk scenarios are:

• Mowing or trimming near an unseen nest — vibration triggers multi-sting defense
• Moving a patio umbrella with a nest on the underside — guaranteed stings
• Opening a shed door with a nest on the inside
• Rolling out a fabric pool cabana or awning — frequent nesting site
• Reaching into a mailbox with a nest inside (laugh if you want — happens every year)

Treatment approach

• Knockdown — aerosol freeze product (pyrethrin-based) from a safe distance (10–15 feet). Works best at dusk or dawn when workers are on the nest.
• Physical nest removal after knockdown — the larvae in the comb will continue developing if the physical nest is left in place. This is a step many homeowners skip, which is why a DIY "spray" often produces a brand-new colony on the same spot two weeks later.
• Residual perimeter treatment on eaves, fascia, and common nesting zones during the March–May foundress period — the highest-leverage prevention window of the year. Stopping a queen before she builds is much easier than removing an established colony.
• Attic and gable vent treatment specifically for red paper wasps, which like concealed cavities

Because new queens overwinter in protected spots around the home, fall and winter sealing of attic vents, siding gaps, and eave cavities is a separate preventive track that reduces next spring's colony count.

Odd, funny, and genuinely true

• The paper in the nest is actually paper. Wasps scrape weathered wood fibers from fences, dead branches, and old wooden structures, mix the fibers with saliva, and chew the mixture into pulp. The resulting material is chemically and structurally almost identical to hand-made paper. Humans arguably invented paper-making by watching wasps — the Chinese eunuch Cai Lun, credited with inventing paper around 105 CE, is traditionally said to have been inspired by a wasp nest.
• A paper wasp colony can relocate its queen. If the dominant foundress is killed early in the season, a subordinate foundress can take over — nest usurpation and replacement have been documented in multiple Polistes species. The new dominant female destroys the old foundress's eggs and younger larvae and replaces them with her own.
• Paper wasps are territorial about specific spots. If you destroy a nest in a particular eave corner, next year's nest will very often be built on or within a few inches of the exact same spot. The location itself has the right microclimate, access, and shade — and foundresses evaluate sites using the same criteria year after year.
• The sting pain is worse when dry. Wasp venom contains kinins and phospholipases that work faster in low-humidity conditions. Central Texas summers — high heat, often dry afternoons — produce reliably painful paper wasp stings compared to wetter climates. This is not a myth; it's venom chemistry.
• Foundresses can be marked and tracked. Research wasps are painted with tiny dots of enamel paint on the thorax (each wasp gets a unique color combination). The paint doesn't harm them, and you can track individuals across a season by their "paint codes." This is how most of what we know about paper wasp dominance was figured out.
• A paper wasp queen who loses her nest can steal someone else's. Documented in P. biglumis and several other species — if her own nest is destroyed, she will sometimes invade a conspecific's nest, kill the resident foundress, and take over the colony. This is called intraspecific nest usurpation and is measurably more common in habitats with high predation pressure.
• Paper wasps will drink at puddles on hot days. Collecting water for evaporative cooling of the nest is a standard behavior — workers bring water back in their crops and regurgitate it onto the comb, where fanning wings cool the nest through evaporation. A hot Texas afternoon at a birdbath will typically include several paper wasps drinking alongside any other insects present.
• **The invasive European paper wasp (P. dominula) is genuinely replacing native species in some areas.** Studies from Ohio and other Midwestern states have shown P. dominula outcompeting and displacing P. metricus. In Texas the pattern is less clear but worth watching — invasive paper wasps are one of the more under-reported invasive species issues in the state.
• The Apache paper wasp (P. apachus, dominant in West Texas) has one of the larger colony sizes for the genus, sometimes approaching 250 adults — nearly yellowjacket-scale.
• Your hummingbird feeder is a paper wasp attractant. Sugar water in those feeders is valuable nectar to paper wasps. If you see paper wasps constantly hovering around a feeder, the fix is hardware — "bee guards" (small mesh screens fitted over the feeding ports) — not insecticide.

FAQ hooks (for LuperIQ / SEO)

• How do I get rid of wasps on my porch?
• What are those reddish wasps on my house?
• When are wasps most aggressive in Texas?
• Can I spray a wasp nest at night?
• What's the difference between paper wasps and yellowjackets?
• Will wasps come back after I knock the nest down?
• Are paper wasps good for my garden?
• How do I stop paper wasps from building on my eaves?

Sources consulted for this fact sheet include peer-reviewed work on Polistes face recognition (Sheehan & Tibbetts 2011, Science; Tibbetts et al. 2021, Proceedings of the Royal Society B), the Strassmann 1979 Science paper on Polistes annularis honey caching, haplometrotic colony founding research (Makino & Sayama, Pickett & Wenzel), Texas A&M AgriLife Extension species accounts, and the Schmidt Sting Pain Index (Schmidt et al., various publications). Regional species distribution reflects AgriLife's Field Guide to Common Texas Insects.