have a longish abdomen, with large bristles on the hinder margins of the
segments. Thorax with three longitudinal streaks. The flies suck up
sweat, but do not bite. The eggs develop within the abdomen of the
mother; the flies lay the young larvæ in dead flesh; also, if not kept
clean, in wounds of human beings and animals,—sometimes, too, in the
genital opening of horses, cattle, and swine, in which case the maggots
live as true parasites in the vagina and uterus, causing a secretion of
mucus, upon which they live. Two to three generations yearly; fifty to
eighty maggots each time. _Remedies_: On keeping the flies from cattle,
cf. p. 165; to keep them from meat, flynets, a gauze cover. =Blow Fly=
(_S. carnaria_), with black speckled abdomen.