The Small-headed Fly or Hunchback Fly family consists of approximately 520 species. They have a notable odd appearance featuring a small head, a hunched back and a long tubular feeding appendage. Their compound eyes generally have large facets on top and smaller ones on bottom. They most often live in moderately dry tropical areas. They are often parasites of spiders and will kill its host in the process. Larvae will latch onto a spider’s leg and makes its way up to the body and will force its way through the body wall and will remain there sometimes for years before reaching maturity.