The gonotrophic development of Cuterebra fontinella Clark begins after the larval-pupal molt, the point at which winter diapause often occurs in many Cuterebra spp. Adult females emerge with their eggs at stage 3 and require an additional 5 d to complete oogenesis. Other species of Cuterebra also may have similar developmental sequences and require a period of several days after eclosion to complete development of their ova.