First record of the genus Abrhexosa Freeman from Mexico, with the description a new species, and two new species and new records of the genus Swammerdamella Enderlein (Diptera: Scatopsidae) Author Huerta, Heron Author Dzul, Felipe text Zootaxa 2013 3693 1 journal volume 10.11646/zootaxa.3693.1.4 d77a875b-1d62-4fea-bcc6-c18225f9db71 1175-5326 222229 831CA04E-77B3-45E6-8D42-4BFC8C560A5C Swammerdamella amorimi sp. nov. ( Figs 4 C–F, 5B) Type material. Holotype male, labelled: Mexico , Guerrero, Chilpancingo, Ayutla de los Libres, Localidad La Unión, Rancho “El Camalote”, Trampa Malaise, 7-Abr-16-May-2009 , 70 msnm, col. W. B. Marin, in CAIM. 1 Paratype : male, Mexico , San Luis Potosi, Localidad Totolteo, cerca a la localidad, Trampa Malaise, 24-Abr-1997 , Col. C. Pérez-Rentería & R. Paz-Rodríguez (dissected), in CAIM. Diagnosis. Male: The shape of tergite 6 with median lobe truncate posteriorly, sternite 6 simple and tergite 7 with nearly straight posterior margin are characteristic for this species. Description. Male. Head brown. Eyes with interommatidial spicules; antenna with 7 flagellomeres uniformly brown; pedicel subcylindrical, similar in length to the first flagellomere; flagellomeres I to VI wider than long, distal flagellomere club-shaped; flagellum length, 0.19–0.26 (0.22, n=2) mm; palpus brown, stout, reniform, pointed, sensilla scattered, length, 0.10 mm (n=2); labellum light brown; cardo-stipes with 3 setae. Thorax. Dark brown. Scutum covered with sparse short setae; 8 supra-alar setae; anterior spiracular sclerite with 20 setae; anepisternum with 7 scattered setae; anterior part of katepisternum with 2 setae; posterior spiracular sclerite with 2 setae. Legs brown; coxae dark brown; femora and tibiae dark brown, with normally pale spot; tarsi pale yellow. Wing: length 0.81–0.83 (0.82, n=2) mm, width 0.40–0.41 (0.40, n=2) mm, hyaline, membrane entirely covered with dense, minute, light micropilosity; radial veins short, extending 0.41 of wing length, light brown; 8 dorsal setae on basal portion of R, 6 dorsal setae on R4+5, 2 dorsal setae on R1; posterior veins translucent; fork of M with branches diverging markedly only near apex of wing; false vein faint. Abdomen: Brown; tergite 6 ( Fig. 4 E) with posterior margin produced into a truncate median lobe, distal margin sclerotized; slightly bilobed on anterior margin; length, 0.32 (n=2) mm, width, 0.027–0.28 (0.27, n=2) mm; sternite 6 simple, rectangular ( Fig. 4 F). Segment 7 ( Fig. 4 C), length, 0.20–0.21 (0.20, n=2) mm. Tergite 7 ( Fig. 5 B) length, 0.08–0.09 (0.08, n=2) mm, width, 0.15–0.16 (0.15, n=2) mm, with anterior margin almost straight, posterior margin concave, with usual median process, truncate apically, and a second process shorter and more sclerotized. Intersegmental membrane of segment 7, with lateral specialized group of setae. Sternite 7 ( Fig. 5 B) U-shaped, length, 0.16 mm (n=2), width, 0.20–0.21 (0.20, n=2) mm; with anterior sclerite bar; medially more sclerotized Vshaped; posterior margin rounded, with a shallow median emargination sclerotized. Genital capsule ( Fig. 4 D) length, 0.12 (n=2) mm, width, 0.11–0.12 (0.11, n=2) mm, gonocoxite lobulated (sensu Cook, 1956), posterior margin with spinulae; aedeagal plate with posterior margin pointed; penis valve (sensu Cook, 1956) rounded, with scattered setae. Female . Unknown. Distribution. Neotropical. Mexico (San Luis Potosi, Guerrero). Etymology. The species is named in honor of Dr. Dalton De Souza Amorim, Universidade de São Paulo, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Departamento de Biologia, for his invaluable contribution to the systematic of the family Scatopsidae . Discussion . Swammerdamella amorimi distinguished by shape of tergite 6 and having tergite 7 almost straight in posterior margin. Sternite 7 is similar in all these species (see key below for separation of Mexican species of Swammerdamella ).