Sensory-trichites
Guides
Chrysops callidus
Beautiful Deer Fly
Chrysops callidus is a species of deer fly in the family Tabanidae, first described by Osten Sacken in 1875. Commonly known as the Beautiful Deer Fly, this species is distributed across Canada and the United States. Females possess a specialized food canal with twelve pairs of putative sensory trichites that monitor blood flow during feeding. The species serves as an intermediate host for the haemosporidian parasite Haemoproteus metchnikovi, with documented sporogonic development occurring in the fly's midgut epithelium.