[3.0063] Pteromicra melanothrix MELANDER, NEW SYNONYM OF Antichaeta melanosome MELANDER, WITH A KEY TO THE NEARCTIC SPECIES OF Pteromicra LIOY (Diptera: Sciomyzidae) 1 L. V. Knutson 2 Pteromicra melanothrix Melander, 1920 (page 313), was described from 1 male collected at Yellowstone Lake, Wyoming, August 9, 1918, and Anti-chaeta melanosoma Melander, 1920 (page 318), was described from 1 female collected during July in Polk County, Wisconsin. Comparison of the holotypes of P. melanothrix and A. melanosoma, which are now in the United States National Museum of Natural History, Washington, has revealed that these re-present 1 species of the genus Antichaeta Haliday. Furthermore, the male genitalia of the holotype of P. melanothrix compare exactly with published figures of the genitalia of A. melanosoma (Steyskal, 1960), with genitalia of specimens associated with females and obtained during rearings in Ithaca, New York, and with other specimens of A. melanosoma from Quebec, Ontario, New York, Ohio, Michigan, Wisconsin, North Dakota, Nebraska, Idaho, Utah, and Wyoming. Antichaeta melanothrix (Melander), 1920, new combination, is placed as a junior synonym of Antichaeta melanosoma Melander, 1920. Species of Antichaeta lack a propleural bristle and belong to the Tetano-cerini; species of Pteromicra Lioy have a propleural bristle and are placed in the Sciomyzini. Many species of Antichaeta are very similar in size and color pattern to Pteromicra, but they may be further distinguished from Pteromicra by the following characters: arista with black hairs; midfrontal stripe broad, shiny and complete; hind tibia with 2 dorsal pre-apical bristles; epandrium of the male postabdomen strongly asymmetrical; fifth abdominal sternum pro-jecting under the postabdomen in the male; anterior surstylus of the male 'Accepted for publication: September 23, 1970. Systematic Entomology Laboratory, USDA, c/o [U.S.] National Museum of Natural History, Washington, DC 20560. Ent. News, 81:247-251. 247
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