Roly poly bugs are known by a variety of names, including pill bug, sow bug and potato bug. The roly poly bug gets its name from its ability to roll up into a ball if it feels threatened. The bugs have a hard gray or brown shell, called an exoskeleton, seven pairs of legs and two pairs of antennae.
Bed bugs (scientific name: Cimex lectularius) are inherently parasitic in nature and feed on human blood and blood of other warm blooded animals. They are of the cimicid family of insect species, and reside in and around the beddings, bed sheets and other areas of hibernation.
Spider beetle. Spider beetle is very similar in appearance to a bed bug. It has a shiny brown body which measures about 1/7th inches and has a humpbacked appearance. Like bed bugs, spider beetles prefer the dark and are most active at night. During the day, they hide in cracks and crevices as well as in areas with food grains.
Cimex lectularius, the common bed bug, is the best known as it prefers to feed on human blood; other Cimex species specialize in other animals, e.g., bat bugs, such as Cimex pipistrelli (Europe), Cimex pilosellus (Western United States), and Cimex adjunctus (entire Eastern United States).
Trombicula is a genus of mites that we call chiggers in their larval stage. Trombicula doremi as well as Trombicula fasola were named by scientists Brennan and Beck in 1955, which was actually before the song was written for the 1959 Broadway musical The Sound of Music.
Appearance: Fleas are black to reddish brown and are smaller than bed bugs, ranging from 1.5-3.3 mm long. They also appear narrower and more oval shaped. Fleas are flat in the vertical plane, whereas bed bugs appear flat horizontally. Fleas also have long, powerful legs with the hind pair being thicker and adapted for jumping.