pest identification

How to Identify Common Household Pests: A Homeowner's Guide

Knowing what you are dealing with before you call anyone changes everything. This guide covers the most common pests found in Westchester County homes: what they look like, where they hide, and what their presence actually means.

Michael Corsetti, Structural Pest Control Specialist June 15, 2026 13 min read
How to Identify Common Household Pests | Pristine Pest Westchester County

Calling an exterminator and saying "I have bugs" sends the technician in blind. The better you can describe what you found, where you found it, and when you first noticed it, the faster the inspection goes and the more accurate the treatment proposal. This guide is designed to help you go into that conversation with real information.

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The rest of this guide gives you the full picture on each pest: size, color, behavior, where they hide, and what their presence signals.

Cockroaches

Three species account for nearly all residential cockroach calls in Westchester County. Getting the identification right is critical because the treatment is completely different for each.

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German Cockroach High Priority
Blattella germanica
Size
Β½ inch (adult)
Color
Light brown, two dark parallel stripes behind head
Where found
Kitchen, under appliances, cabinet hinges, bathroom
Active period
Year-round indoors
Signs of infestation
  • Small dark droppings (like ground pepper) in cabinet corners
  • Egg cases (brown, ribbed, 5-8mm) glued under appliances
  • Musty odor in heavy infestations
  • Live bugs visible during daylight (sign of heavy population)

German roaches are the most difficult household pest to eliminate. They breed entirely indoors and can produce hundreds of offspring from a single female. If you see them during the day, the population is already large enough that harborage areas are overcrowded.

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American Cockroach Moderate
Periplaneta americana
Size
1.5 to 2 inches (largest common roach)
Color
Reddish-brown, yellowish figure-8 pattern behind head
Where found
Basement, floor drain, crawl space, sewer access
Active period
Year-round, more common spring through fall
Signs of infestation
  • Large reddish-brown insect seen at night
  • Dark, ridged droppings near drain or sump
  • Musty smell near floor drain
  • Brown egg cases near water sources

American cockroaches enter from outside or via sewer systems. Finding one occasionally is less alarming than finding dozens. They prefer moisture and warmth, so leaky pipes and floor drains are common entry points.

Ants

Ants are the most common pest call we receive in spring and early summer. Several species are present in Westchester County homes, and the treatment approach differs significantly.

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Odorous House Ant Moderate
Tapinoma sessile
Size
1/16 to 1/8 inch
Color
Dark brown to black
Where found
Kitchen, along walls, near water sources
Distinctive feature
Rotten coconut smell when crushed
Signs of infestation
  • Trails along countertops and walls
  • Activity near moisture (leaky faucet, dishwasher base)
  • Multiple entry points (hard to locate single source)
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Carpenter Ant High Priority
Camponotus species
Size
3/8 to 1/2 inch (workers), larger (queens)
Color
Black or black with reddish-brown thorax
Where found
Window frames, door frames, moisture-damaged wood, attic
Concern level
Structural: excavate galleries in wood
Signs of infestation
  • Large black ants (biggest ant you will see indoors)
  • Sawdust-like frass near wood trim or window frames
  • Workers foraging alone, not in visible trails
  • Swarmers (winged reproductives) indoors in late spring

Unlike termites, carpenter ants do not eat wood. They excavate it to build galleries, preferring wood that is already softened by moisture. Finding carpenter ants indoors usually means there is a moisture problem somewhere in the structure.

Rodents

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House Mouse High Priority
Mus musculus
Body size
2.5 to 3.5 inches (tail adds equal length)
Color
Gray to brown, lighter underside
Entry gap
Can enter through a gap the size of a dime
Peak entry season
September through November
Signs of infestation
  • Rice-grain size dark droppings along walls and in cabinets
  • Gnaw marks on food packaging, wood trim, or wiring
  • Grease smears along baseboards (from fur oil)
  • Musky odor, especially in confined spaces
  • Nesting material (shredded paper, insulation) in drawers

A single mouse produces 50 to 80 droppings per day. Finding a handful of droppings does not mean one mouse. Finding droppings in multiple locations means an established population. Mice breed year-round indoors and a pair can produce 10 litters annually.

Termites

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Eastern Subterranean Termite High Priority
Reticulitermes flavipes
Worker size
1/8 inch, cream-white, no eyes
Swarmer size
3/8 inch including wings
Where found
Below grade, in soil, mud tubes on foundation
Swarm season
March through June (Westchester)
Signs of infestation
  • Mud tubes (pencil-width) on foundation walls or crawl space piers
  • Winged swarmers emerging from foundation cracks in spring
  • Discarded wings in window sills or near exterior doors
  • Hollow-sounding wood when tapped
  • Damaged wood with thin galleries running parallel to grain

Ants vs. Termites: The Most Confused Pair

Termite Swarmer
  • Straight, thick body (no pinched waist)
  • Two pairs of wings, equal length
  • Sheds wings immediately after landing
  • Antennae straight (not elbowed)
  • Creamy white to light brown color
Ant Swarmer
  • Pinched waist clearly visible
  • Front wings larger than rear wings
  • Keeps wings until they break off
  • Antennae elbowed (bent at 90 degrees)
  • Black, red-black, or dark brown

If you find a pile of wings on a windowsill with no insects: those are almost certainly discarded termite wings. Termite swarmers shed their wings within minutes of landing. Ant swarmers keep theirs until mating is complete or they break off over time.

Bed Bugs

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Bed Bug High Priority
Cimex lectularius
Adult size
1/4 inch (apple seed)
Color
Reddish-brown; darker after feeding
Where found
Mattress seams, box spring, headboard, baseboard
Shape
Flat oval (unfed); swollen after feeding
Signs of infestation
  • Small dark fecal spots (pen-tip size) on mattress seams or behind headboard
  • Shed skins (translucent, five sizes as nymphs grow)
  • White eggs or eggshells in seams and cracks
  • Sweet, musty odor in heavy infestations
  • Unexplained bite marks in lines or clusters on exposed skin

You are more likely to find evidence of bed bugs than live bugs. They feed at night and hide in tight crevices during the day. Check mattress seams, the gap between mattress and box spring, and the joints of the headboard with a flashlight and a credit card to probe seams.

Stinging Insects

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Yellow Jacket / Paper Wasp Moderate
Vespula / Polistes species
Yellow jacket size
1/2 to 5/8 inch; yellow and black banded
Paper wasp size
5/8 to 3/4 inch; narrower waist than yellow jacket
Nest locations
Yellow jackets: underground or wall voids. Paper wasps: eaves, overhangs
Season
Colonies peak July to September
Signs of nesting
  • Repeated wasp activity from a specific point (gap in siding, ground hole)
  • Paper nest visible under eave or overhang
  • Wasp activity increasing indoors via gap in attic or wall void

Yellow jackets nesting in wall voids are a particularly hazardous situation. They can chew through drywall and emerge inside the home, especially as colonies grow in late summer. Do not seal the entry point without treatment first.

A Note on Ticks

Deer ticks (black-legged ticks) are not household pests in the traditional sense, but they are a significant health concern throughout Westchester County. Adults are sesame-seed size. Nymphs, which are responsible for most Lyme disease transmission, are poppy-seed size and extremely easy to miss. They are found in leaf litter, tall grass, and along the edges where lawn meets wooded or naturalized areas.

Finding a tick on yourself or a family member after yard time is not an infestation, but recurring tick encounters on the property warrant a seasonal tick barrier treatment program. Three to five targeted barrier spray applications from late spring through fall significantly reduce tick populations in the treatment zone.

When to Call a Professional

Some identifications you can make with confidence from this guide. Others require a professional inspection to confirm. Call a professional when:

Not Sure What You Found?

Describe it to us and we will help identify it. If an inspection is warranted, we schedule fast and inspect thoroughly. Serving all of Westchester County.

Frequently Asked Questions

How do I identify what pest I have?
Start with size and color. Small light-brown insects with dark stripes near your stove are German cockroaches. Large reddish-brown insects near drains are American cockroaches. Tiny reddish-brown flat insects near bedding are bed bugs. Winged swarmers emerging from the foundation in spring are likely termites. Mouse evidence is easier: small rice-grain size dark droppings along walls or in cabinets.
What are the most common household pests in Westchester County?
The most common are German cockroaches (kitchens), American cockroaches (basements and drains), odorous house ants and carpenter ants, Eastern subterranean termites, house mice (fall and winter entry), bed bugs, yellow jackets and paper wasps, and deer ticks. Cockroaches and ants are year-round concerns; rodents peak in fall; wasps peak in late summer.
How do I tell the difference between ants and termites?
Three key differences: (1) Ants have a pinched waist; termites have a straight thick body. (2) Ant swarmers have wings of two different sizes; termite swarmers have two pairs of equal-length wings. (3) Termite swarmers shed their wings almost immediately after landing, leaving piles of wings at windowsills. Ants keep their wings.
What do mouse droppings look like?
Mouse droppings are 1/8 to 1/4 inch long, dark brown to black, and shaped like a tiny cylinder with pointed ends, similar to a grain of rice. Fresh droppings are dark and shiny; old ones turn gray and crumble. Finding more than 10 to 20 droppings in a concentrated area indicates an established population, not a single mouse.
What do bed bugs look like to the naked eye?
Adult bed bugs are about 1/4 inch long (roughly apple-seed size), oval, flat, and reddish-brown. After feeding they become darker and swollen. You are more likely to find shed skins, dark fecal spots about the size of a pen dot, or a subtle sweet musty odor before you see a live bug. Check mattress seams and the headboard frame with a flashlight.

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This content is for informational purposes only and does not constitute professional pest control advice. Pest situations vary by property, severity and species. Contact a licensed pest control professional for an assessment specific to your home. Pristine Pest Control holds NY DEC License 7A (General) and 7B (WDO), serving Scarsdale and Westchester County.

Found Something You Cannot Identify?

Call us or describe what you found and we will help. Licensed pest inspectors serving Scarsdale and all of Westchester County.