1. Thecomyia longicornis Perty, 1833 (Figs. 6, 18, 30, 41, 42) Thecomyia longicornis Perty, 1833: 189 [designated as type species; type­locality: "Amazon", Brazil].­ Rondani, 1868: 79 ­80, [redescription].­ Hendel, 1932: 98 [suggested synonym with Thecomyia limbata].­ Curran, 1934: 458 [distribution].­ Abercrombie and Berg, 1975 [revalidation of name].­ Knutson et al., 1976: 13 [Neotropical catalog].­ Knutson and Carvalho, 1989 [seasonal distribution].­ Marinoni and Mathis, 2000: 209 [cladistic analysis]. Description. Adult. Upper orbital seta present (very weak to strong). Fronto­orbital spot rounded, width approximately 1/4 of frontal width. Rostrum in males 0.57­0.66 and in females 0.59­0.69 as high as eye. White microtomentose infra­ocular marking forming an irregular triangle with margin between gena and postgena indented, not reaching oral margin. Mid femur without anteromedial seta. Mid and hind femora usually wholly yellowish. Mesonotum with complete medial yellow stripe. Ejaculatory apodeme narrow at apex (Fig. 6). Phallapodeme narrow and strongly concave at articulation with basiphallus, without subapical process, strongly curved. Epiphallus with proximal 1/3 well sclerotized, concave, short, extending to distiphallus base. Anterior basiphallic process with apex digitiform. Distiphallus very complex with a short, coiled acrophallus. Hypandrium in lateral view with dorsal margin strongly concave and anteroventral margin slightly sinuous (Fig. 18). Anteroventral hypandrial plates in frontal view narrow. Membranous projections of margins of anteroventral hypandrial plates well developed, extending to lateral margins of hypandrium; covered with minute hairs. Anterior surstylus absent; posterior appearing as a narrow bar. Female sternites 6, 7 and 8 almost fused, suture between 6 and 7+8 visible; wider than long, anterior margin of sternite 6 sinuate. Spermathecal duct with sclerotized region joining spermatheca elongate; apical, digitiform projection well developed (Fig. 30). Type specimens.­In the original description (Perty, 1833) neither the number nor the sex of specimens are indicated. Thus, we have designated the female type we examined from the Zoologische Staatssammlung Museum, Munich, Germany, as the LECTOTYPE to stabilize the usage of this name. The specimen has been examined and the abdomen dissected by L. Marinoni. Marion Kotrba kindly remounted the specimen since it was very close to the label and it was difficult to examine the specimen and to read the label. The identity of T. longicornis was confirmed by the presence of the fronto­orbital seta and by the shape of the spermatheca. The specimen is in good condition and has two frontoorbital setae on the right side of head. There are two labels. The first one, handwritten using brown ink, has green borders: " Brasil. Th. longicornis Pty ". The second one is a recent addition: "Zoologische Staatssammlung München". Other specimens examined.­ NICARAGUA. Chinandega, no date, Baker col., 1 f. (USNM). COSTA RICA. Puntarenas, Golfito, 1948, P. & D. Allen cols., 1 f. (USNM). VENEZUELA. Caripito, 15 Mar 1942, no col., 2 m. (AMNH). GUYANA. Kaieteur (high forest), 6 Sep 1937, Richards & Smart cols., 1 m. (BMNH); Mazaruni (high forest), 21 Aug 1937, same cols., 1 f. (BMNH); Rio Essequibo, no date, J. Ogilvie col., 1 f. (USNM); Berbice, Blairmont, no date, H. E. Box col., no abdomen (BMNH); Ceiba (ca. 40 km s. Georgetown), 6o 29. 9'N, 58o 13. 1'W, 28 Aug 1997, W. Mathis col., 1 m. (USNM). SURI­ NAME. Moengo, Boven, Cottica, R. Suriname, 17 May 1927, Cornell University, Lot 760, Sub. 61, 2 m. (USNM). BRAZIL. AMAPÁ: Serra do Navio, 15 Oct 1957, K. Lenko col., 1 m. (MZSP); Porto Platon, 21 Sep 1957, J. Lane col., 1 f. (MZSP). PARÁ: Santana, Feira dos Macacos, Sep 1969, Exp. Permanente da Amazônia, 3 m. and 2 f. (MZSP); Rio Xingú (52o22'W, 3o39'S), 60 km from Altamira, 2­8 Oct 1986, P. J. Spangler & O. S. Flint cols., 1 m. and 2 f. (USNM); Belém, Mocambo, 1 Jul 1965, H. Souza­Lopes & P. W. Miranda cols., 1 m. (USNM); same locality, 03.IX.1977, M. F. Torres col., 2 m. and 2 f. (MPEG); same locality, same date, A. Y. Harada col., 1 f. (MPEG); same locality, 28 Nov 1977, W. L. Overall col., 1 f. (MPEG); same locality, same date, Malaise trap, 1 f. (MPEG); same locality, same date, M. F. Torres col., 3 m. (MPEG); same locality, same date, C. Fonseca col., 1 m. (MPEG); same locality, 15 Sep 1977, M. F. Torres col., 3 m. (MPEG); same locality, 14 Mar 1977, M.F. Torres col., 3 m. (MPEG); same locality, 26 Dec 1979, P. Tadeu col., 3 m. (MPEG); same locality, same date, M. F. Torres col., 2 m. (MPEG); same locality, Dec 1969, J. Barata col., 3 m. (MPEG); same locality, 06.V.1977, M. F. Torres col., 3 f. (MPEG); same locality, 30 Aug 1969, T. Pimentel col., 6 f. (MPEG); same locality, 5 Mar 1977, M. A. Silva col., 1 f. (MPEG); same locality, same date, A. Y. Harada col., 1 f. (MPEG); same locality, same date, N. Guimarães col., 1 m. and 3 f. (MPEG); Airi, 23 Nov 1936, Damasceno col., 1 m. (USNM); Utinga, NE edge of Belém, 29 Jul­01 Aug 1964, C. O. Berg col., 2 m. and 2 f. (USNM); Peixe Boi, 12 Apr 1977, M.F. Torres col., 1 m. (USNM); no locality, no date, Baker col., 3 m and 5 f. (USNM). PERU. San Martin, Juanjui, 5 Dec 1946 (1600 ft), J. C. Pallister col., 1 m. (USNM). Loreto: Pucallpa, 13 Nov 1946 (600 ft), same col., 1 f. (USNM).

Published as part of Marinoni, Luciane, Steyskal, George C. & Knutson, Lloyd, 2003, Revision and cladistic analysis of the Neotropical Genus Thecomyia Perty (Diptera: Sciomyzidae), pp. 1-36 in Zootaxa 191 on pages 14-16, DOI: 10.5281/zenodo.156857