The family Calliphoridae-Con. The genus Cordylobia Grimberg The genus Stasisia Surcouf _ The genus Lueilia Robineau-Desvoidy (including Phaen icia Robineau-Desvoidy). The genus Cynomyopsis Townsend The genus CaUiphora Robineau-Desvoidy and related genera Key to restricted genera and species The family Gasterophilidae__,_ The genus Gasterophilus Leach The family Cuterebridae Key to genera The genus Cuterebra Clark__ The genus Dermatobia Brauer The genus Cephenemyia Latreille The family Hypodermatidae The genus Hypoderma Latreille The family Oestridae Key to genera The genus Oestrus Linnaeus. The genus Rhinoestrus Brauer The family Muscidae (including the Anthomyiidae) Key to genera The genus Anthomyia Meigen The genus Pa regie Schnabl and Dziedzicki The genus Hylemya Robineau-Desvoidv Page 79 87 121 'Acknowledgment is made to many persons for help and suggestions, but particularly to Alan Stone and Charles T. Greene, of the Division of Insect Identification, for critical reading of certain parts of the manuscript, and to the Division of Insects Affecting Man and Animals for some of the illustrations used in this work. The original drawings and diagrams were made by Arthur Cushnian, of the Division of Insect Identification.

James {in Stone et al., 1965, "Catalog of the Diptera of America North of Mexico," Agric. Res. Serv. Handbook 276) listed Hermetia aurata Bellardi (with H. a. eiseni Townsend as a subspecies and H. chrysopila Loew as a synonym), as a single variable species with wide geographic distribution in the southwestern United States and Mexico. Though some spade work that had been done by Wirth indicated that the three forms were specifically distinct and, in addition, several undescribed taxa were involved, more time and specimens were necessary to resolve the problem. The present study is built upon this foundation and includes a preliminary key plus additional material that has been assembled from a number of collections: the United States National Museum,

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