HUMAN BODY LOUSE, SEM. Head and thorax of a female body louse Pediculus humanus corporis, colorized SEM ventral view, x 76. The paw of the insects is constituted of five segments : coxa hip, trochanter, femur, tibia and tarsus. Among certain insects, such as the louse, a sixth segment, terminal is present : pretarsus or arolium, consisting of a claw. This claw enables the louse to hold on to clothes. Body louse Pediculus humanus corporis Pediculus humanus Pediculid Louse Phthiraptera Insect