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Megagrapha Melander and the four other New World genera named below are defined as a natural group which belong to the tribe Drapetini of the subfamily Tachydrominae. Both the genus group and the component genera are described and keys to genera and species are presented. One new genus, Chaetodromia Chillcott from Mexico is described, with two new species. One new species is described in Megagrapha, five in Austrodromia Collin, four in Allodromia Smith, and 17 in Micrempis Melander. Micrempis testacea Melander is transferred to Allodromia, and Allodromia curviradius Smith is transferred to Micrempis. Megagrapha exquisita (Malloch) is resurrected from synonymy as a valid species. Lectotypes are designated for Micrempis minuta (Melander), M. nana Melander, and M. varipes Melander.

Litoleptis alaskensis, a new genus and species from Alaska, and Bolbomyia melanderi, a new species from the Appalachians, are described. Cekendia wuorentausi is redescribed, and the genus synonymyzed with Bolbomyia. Further records of the Nearctic species of Bolbomyia are given. A generic group composed of Hilarimorpha, Litoleptis, Bolbomyia, Archicera and Austroleptis is proposed.

The following descriptions and notes are based on Palaearctic material of Fanniinae in the U.S. National Museum, Washington, D.C., and on Indian material in the Canadian National Collection of Insects, Ottawa. One new species is described from Tunisia, one from India, two from Japan, and six from Szechuen province near the China-Tibet border in China. Special thanks are due Dr. R. H. Foote of the U.S. National Museum for making this material available to me.

Abstract>Descriptions and figures are presented of both adult and immature stages of a new species, Fannia moseri, from nests of Atta texana in Louisiana; and the female and larvae of F. binotata Chillcott, and mature larvae of F. americana Malloch, from nests of Bombus spp.