Human Head Louse

Feeling lousy may mean more than having a bad day, particularly if one's head is itchy. Infestations by the human head louse plague many school districts across America and around the world. Head lice, known scientifically as Pediculus capitis, are blood-sucking members of the Class Insecta, and as small parasites, are exquisitely fit to live on the scalp and neck hairs of human hosts.