An Asian longhorned beetle is from 20 to 35 mm long. It has long black antenna, with white bands. Its black elytra are marked with about twenty irregular white spots. The scutellum is black, and its legs are black and greyish-blue.
The dermestid beetle is a dark brown or black beetle whose elytra feature a wide stripe of smaller, lighter hairs that range from yellow to grey or white in colour. This stripe has six black dots in the centre (three on each elytra) that vary in size and shape. Its head has two short, club-shaped antennae. Two pairs of wings are attached to its thorax. Under its elytra are two functional wings which are used when the beetle takes flight. Males and females have similar appearances and measure between 6 and 9 mm.
Around 20 species of Dermestidae live in Quebec. Dermestid beetles, whose name means “skin eater,” are frequently found in homes.
The most common, other than the larder beetle (Dermestes lardarius), are the black larder (Dermestes ater), the hide beetle (Dermestes maculatus), the carpet beetle (Anthrenus scrophulariae), the varied carpet beetle (Anthrenus verbasci), the black carpet beetle (Attagenus unicolor), the dermestid beetle (Trogoderma inclusum) and the warehouse beetle (Trogoderma variabile).