252 PROC. ENT. SOC. WASH., VOL. 69, NO. 3, SEPTEMBER, 1967 NEOPARENTIA, A NEW GENUS OF AMERICAN DOLICHOPODIDAE ( DiPTERA ) Harold Robinson, Dcpt. of Botany, Smithsonian Institution, Washington, B.C. During the century since the recognition of Symptjcniis Loew, the genus has been relatively ill-defined and has been easily confused with other genera in various subfamilies such as Symbolia (Diaphorinae), StoUdosoma ( Stolidosominae ) , and Peloropeodes ( Rhaphiinae ) . The most critical efforts have left a large and variable genus, and attempts at further subdivision have depended excessively on characters limited to the male sex. Only recently it has been possible to clarify the status of one very natural and uniform segregate genus, Calyxochaetus, which differs from Sympycnus by the lack of hairs on the scutellum ( Robin-son, 1964). Collecting in southern Mexico I have found a number of species of Sympycninae which lack hairs on the scutellum but otherwise in no way resemble Calyxochaetus. These species all possess long thread-like hypopygial lamellae, a character that led Parent ( 1954 ) to de-scribe a related species from Costa Rica as a Nematoproctiis. For these species I propose the recognition of the following new genus. Neoparentia, gen. nov. Setae mostly black. Face very narrow, usually with eyes contiguous near the middle in the male; front broad, broader above, mostly metallic greenish or bluish; palpi small; proboscis brownish; antennal segment 1 bare above, segment 2 trun-cate apically, segment 3 with arista dorsal; lower orbital setae imiseriate, pale. Mesoscutum not flattened posteriorly; acrostichals vmiseriate; 6 pairs of dorso-centrals; 2 scutellars, scutellum without hairs; proepisternum with only a few pale setae above. Middle and hind coxae with an external bristle; mid femur with both anterior and posterior preapical; hind femur with 1 or 2 preapicals anteriorly; front metatarsus of male not shortened. Wing elongate oval: veins 3 and 4 nearly straight and parallel to noticeably divergent beyond the crossvein; last part of vein 5 distinctly longer than crossvein; vein 6 represented by slight fold. Abdomen cylindrical in male, 6 tergites visible; hypopygium small usually rather globose, placed on tip of abdomen; lamellae filliform. Type species, Neoparentia bisetosa sp. n. The various hypopygia of Neoparentia are highly divergent in fonn but in no case show the conical shape that is typical of Calyxochaetus. Neither are the hypopygial lamellae short and inconspicuous as in that genus. In addition, Cahjxochaetus usually has a shining violet front (obscured by pollen in C nodatus), and usually has the front meta-tarsus of the male shortened (not shortened in C. metatarsal is). The face of Neoparentia is narrower in both sexes, Vi as wide below as high in the female compared Vs or more as wide below as high in the female of Cahjxochaetus.