Cuterebra fontinella

This is the mouse bot fly. The species, Cuterebra fontinella, is a parasite of rodents, preferably parasitizing the white-footed mouse. The adult does not feed. The larva feeds under the skin of rodent hosts. When full grown, it pops out of the host and pupates in the soil. 

Order: Diptera
Family: Oestridae
Species: probably Cuterebra fontinella

Photograph: © 2015 RKD Peterson
Date of Photograph: 22 June 2015
Location: Montana, Gallatin Co. (45°42'55" N 110°58'47" W)
Collected by: CR Brown