Leptogastrinae

Dennis, Steve, Barnes, Jeffrey K. & Knutson, Lloyd, 2013, Review and analysis of information on the biology and morphology of immature stages of robber flies (Diptera: Asilidae), Zootaxa 3673 (1), pp. 1-64 : 7

Subfamily Leptogastrinae

Females in the genus Leptogaster drop, singly, 1 to 8 eggs to the ground as they are flying or resting on vegetation. The oval eggs are amber to light yellow-brown or light yellow. They range in length from 0.32 to 0.50 mm and width from 0.25 to 0.39 mm.

The surface of the eggs of Leptogaster and Psilonyx is either smooth, or they have varying shapes of polygons without ridges. The eggs of Beameromyia and Tipulogaster are smooth without ridges. Aeropyles have not been observed on Leptogastrinae eggs. There are one or two micropyles in a smooth to elevated area. The egg stage lasts for 9 to 14 days.

Leptogaster larvae develop in soil; those of Mesoleptogaster are said to develop in deciduous trees. Morphological information, including figures, is available for Leptogaster larvae and pupae, and Apachekolos pupal cases.