Microdon baliopterus

Distribution
Arizona, California, Colorado, Georgia, Kansas, Nebraska, Nevada, New Mexico, South Dakota, Texas (type), Utah, Wyoming.

Biology
Ant host: Monomorium minimum Collected in nests under rocks in the Chisos Mountains, Texas by van Pelt. During investigations on the ants of the Chisos Mountains in Big Bend National Park, Tex., larvae and pupae of Microdon balioptcrus Loew were recovered from nests of Monomorium minimum (Buckley) on July 11, 1970, and July 3 to Aug. 10, 1971. The nests were situated in Ward Canyon, basin side, at 5600 ft, and Pine Canyon at 5400 ft. The colonies were under rocks near the bottom of an oak canyon with northern exposure. The typical nest area was flat with 1 in. of leaf litter and 70% canopy, mostly oak. Eggs and larvae of Monomorium were present in all cases.