Pictures of Roaches for Identification: 6 Species Side by Side, Nymphs and Lookalikes
Match your roach photo to the right species by four features: size, the pattern on the shield behind the head, wing length and where you found it. German, American, Oriental, brown-banded, Australian and smokybrown cockroaches compared, plus what the babies look like and the bugs mistaken for roaches.
You can name almost any roach in a photo by looking at one spot: the flat shield just behind the head, called the pronotum. German cockroaches have two dark stripes on it, American cockroaches a pale ring around the edge, Australian cockroaches a bright yellow ring, smokybrown cockroaches nothing at all, and Oriental cockroaches a plain glossy black one. Add size and wing length and the six common species separate cleanly, as the comparison below shows.
This guide tells you what to look for in your own picture, feature by feature, instead of a gallery of similar brown insects. For habits and hiding places of each species, see the cockroach identifier.
The six common roaches side by side
Sizes are adult body length without antennae. A US penny is 19 mm across, which makes a useful scale in a photo.
| Species | Adult size | Colour | Pronotum (shield behind the head) | Wings | Where you find it |
|---|---|---|---|---|---|
| German | 12 to 16 mm | Tan to light brown | Two dark parallel stripes | Full length, rarely flies | Kitchens, bathrooms, appliances |
| Brown-banded | 10 to 14 mm | Light brown | Plain or darker centre, no stripes | Male full length and flies; female short | High and dry: upper cabinets, picture frames, electronics |
| Oriental | 25 to 32 mm | Glossy black to very dark brown | Plain, dark | Male covers about three quarters of the body; female only stubs; neither flies | Damp basements, drains, crawl spaces |
| American | 35 to 50 mm | Reddish brown | Pale yellow ring around a darker centre | Longer than the body, glides | Basements, sewers, boiler rooms |
| Australian | 30 to 35 mm | Reddish brown | Bright yellow ring, sharper than American | Long, with a pale yellow streak on each shoulder | Warm climates, greenhouses, outdoors near homes |
| Smokybrown | 30 to 38 mm | Uniform dark mahogany, shiny | Uniform dark, no pattern | Longer than the body, strong flier | Attics, gutters, trees, flies to porch lights |
If your roach is small (under 16 mm) the choice is almost always German or brown-banded. If it is large (over 25 mm) it is one of the other four. That one split removes most of the guesswork.
Small roaches: German vs brown-banded
German cockroach. The two dark stripes on the pronotum are the single most useful feature in roach identification; they are visible even in a blurry phone picture. The body is tan, slim and slightly shiny, with wings covering the whole abdomen in both sexes. German cockroaches live almost exclusively indoors near warmth, water and food, so a small striped roach in the kitchen is a German cockroach until proven otherwise.
Brown-banded cockroach. Similar size, but look across the body rather than along it: two pale, creamy bands run sideways across the wings (on females, across the abdomen, because their wings are shorter). There are no dark stripes on the pronotum. Males are slender and winged to the tip; females are broader. Location helps as much as markings: a small roach on a ceiling, behind a picture frame or inside a TV is probably brown-banded.
One trap: the Asian cockroach. In the southeastern US it looks identical to the German, stripes included, but lives outdoors and flies readily to lights at dusk. A striped roach that flew in from the patio is probably Asian, and it rarely settles indoors.
Large roaches: American, Australian, smokybrown, Oriental
American cockroach. The biggest common house roach. Reddish brown all over, with a pale yellowish band around the edge of the pronotum that frames two darker blotches, often described as a figure 8 or a pair of eyes. Wings extend past the end of the body in both sexes.
Australian cockroach. Slightly smaller than the American and easily confused with it. Two features settle it: the yellow ring on the pronotum is brighter and more sharply outlined, and each forewing has a pale yellow streak along its outer front edge, like a stripe on each shoulder. Despite the name it is a widespread tropical species, common in Australia, Florida, the Gulf Coast and greenhouses worldwide.
Smokybrown cockroach. Close to American size but uniformly dark: shiny mahogany to brown-black with no pattern on the pronotum at all. A strong flier drawn to lights, it lives mostly outdoors in trees, gutters and mulch in the southeastern US, Japan and parts of Australia. A large, dark, plain roach that flew in at night is almost always this one.
Oriental cockroach. The only large one that looks black and cannot fly. The body is broader and more rounded than the others and has a greasy shine. Males have wings that stop short of the tip of the abdomen; females have only small wing pads and look wingless. It favours cool, damp basements, floor drains and porches, and moves slowly for a roach. In the UK and northern Europe this and the German cockroach are the two species found indoors.
Baby cockroaches: what nymphs look like
Young roaches are wingless and often a different colour from the adults, which is why they are so often mistaken for other bugs. All of them have the roach outline: a flat oval body, long thread-like antennae, spiny legs and two small tail feelers (cerci) at the back.
| Species | Nymph appearance |
|---|---|
| German | Dark brown to nearly black with a single pale tan stripe down the middle of the back. Newly hatched ones are about 3 mm. |
| Brown-banded | Light brown with two distinct pale bands across the body, more obvious than in adults. |
| Oriental | Uniformly dark reddish brown to black; looks like a small adult female. |
| American | Reddish brown and uniform; young ones can look greyish brown. Larger than other nymphs from the start (about 6 to 7 mm at hatching). |
| Australian | Dark with distinctive pale yellow spots on the body, unlike any other common nymph. |
| Smokybrown | Very young nymphs are dark, almost black, with pale tips on the antennae; older ones turn mahogany. |
If you are seeing several small, dark, fast nymphs with a pale centre stripe in the kitchen, that is a breeding German cockroach population, and it is the sign to act on quickly.
Egg cases in your photo
Roaches lay eggs in a tough capsule (ootheca) shaped like a tiny purse with a ridged seam along the top. A light brown case about 8 mm long is German, usually still attached to the female. Small (about 5 mm) reddish cases glued in clusters under furniture or shelves are brown-banded. Dark reddish brown to black cases of 8 to 10 mm, dropped near food or in damp corners, come from the large species.
Bugs that get mistaken for roaches
"Palmetto bug" and "water bug". These are nicknames, not species. In Florida and the Southeast, "palmetto bug" usually means the American cockroach, the Australian cockroach or the Florida woods cockroach, a large (30 to 40 mm), dark, slow roach with only short wing pads that can give off a foul smell. In much of the US, "water bug" means the Oriental cockroach. All of these are roaches and are identified with the table above.
True water bugs (giant water bugs). A genuinely different insect: lives in ponds and pools, often lands near porch lights, can be larger than any roach (up to 6 cm in the US), and has thick, grasping front legs like pincers, very short antennae and a pointed beak under the head. Roaches have long antennae and no pincers. Giant water bugs can bite painfully if handled; roaches do not.
Crickets. Big jumping hind legs and long antennae, but the head is visible from above. Camel crickets are humped and wingless. If it jumped, it is not a roach.
Beetles. Ground beetles, June beetles and water scavenger beetles are often reported as roaches. Look for two hard wing covers that meet in a straight line down the middle of the back and a head that sticks out in front. A roach's wings overlap, and its head is tucked under the pronotum, so from above you see the shield, not the face.
Bed bugs. Bed bugs and newly hatched German cockroaches are both small and brown. Bed bugs are rounder, have short antennae, no tail feelers and walk slowly; roach nymphs have long antennae and run. The bed bug identifier covers every bed bug stage.
Wood cockroaches. North American outdoor roaches, chestnut brown with a pale edge on the pronotum and wings, 15 to 25 mm. Males fly to lights in spring; they do not breed indoors.
For tiny dark bugs that are not roaches at all, see tiny black bugs in the house.
How to take a picture that identifies the roach
- Shoot from directly above. The pronotum pattern and wing length only read top-down.
- Add scale. A coin or ruler next to it turns "big" into 40 mm.
- Use daylight. Under a yellow kitchen bulb, German cockroaches look orange and smokybrowns look black.
- Photograph one in a jar or sticky trap. Live roaches run before you focus, and a trap also tells you how many there are.
- Note where and when. Kitchen at night, damp basement, ceiling, or flew in at the door: location is half the identification.
If the pronotum is unclear or you have only a nymph, photograph it and let Bug Identifier confirm the species; it names the roach from one photo and tells you whether you are looking at a wanderer or a breeding indoor species.
What the identification means for you
A German or brown-banded cockroach indoors almost always means a breeding population: bait the cracks where they hide and call a professional if numbers do not drop within a few weeks. The four large species usually come in from outside, a drain or a crawl space, so sealing gaps, fixing leaks and adding drain covers matters more than spraying. The cockroach identifier has the full treatment notes for each.
Frequently asked questions
How do I identify a roach from a picture?
Look at the shield behind the head (pronotum), then size and wings. Two dark stripes on a small tan roach: German. Pale bands across a small roach: brown-banded. Large, reddish, pale ring on the shield: American. Bright yellow ring and yellow shoulder streaks: Australian. Large, dark and plain: smokybrown. Black, broad and short-winged: Oriental.
What does a baby cockroach look like?
A small, flat, wingless oval with long antennae and two tail feelers. German cockroach babies are dark with one pale stripe down the back, brown-banded babies have two pale cross bands, and Australian babies have yellow spots. Babies indoors mean roaches are breeding nearby.
Is a palmetto bug a cockroach?
Yes. "Palmetto bug" is a regional name in the southeastern US for large roaches, usually the American, Australian or Florida woods cockroach. They mostly live outdoors and wander in.
What is the difference between a water bug and a cockroach?
"Water bug" is often a nickname for the Oriental cockroach. A true giant water bug is an aquatic insect with grasping front legs, short antennae and a beak, and it can bite. Cockroaches have long antennae, no pincers and do not bite people in normal circumstances.
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