PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM issued iMfii\A,^M iy the SMITHSONIAN INSTITUTION U. S. NATIONAL MUSEUM Washington: 1934 Vol. 83 No. 2973 AMERICAN MUSCOID FLIES OF THE GENERA CERA-TOMYIELLA AND PARADIDYMA By H. J. Reinhard Texas Agricultural Experiment Station, College Station, Tex. This paper contains a discussion of the generic characters of the tachinid genera Geratomyiella and Paradidymal keys for separating the species in both sexes, and descriptions of 24 species, of which 15 are new to science. The material used is preserved in the United States National Museum, the Kansas University Museum, and my own collection. I am under great obligations to the late Dr. J. M. Aldrich for the privilege of studying the material in the National Museum collection, which he kindly assembled and forwarded to me, and for carrying on considerable correspondence, in which \qvj helpful notes on the genotype of Paradidyma were supplied through the generous coop-eration of Miss Daphne Aubertin, of the British Museum. To Dr. R. H. Beamer I am indebted for permission to examine the type specimens of Lachnomma magnicornis Townsend and Atrophopoda hraueri Williston, in addition to other material, in the Kansas University Museum. The genera here under consideration may be readily recognized by the row of bristles extending down the inner margin of the para-facial and the bare first vein of the wing. In the female the fore claws and pulvilli are small or atrophied. There are a number of genera sharing this combination of characters except that the first vein of the wing is beset with hairs. Among approximately 200 specimens of Geratomyiella and Paradidyma examined in the pres-73007—34 1 a
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