Revision of Opeatocerata Melander, 1928 (Diptera: Empididae: Empidinae) Author Câmara, J. T. Author Rafael, J. A. text Zootaxa 2014 3846 4 502 546 journal article 10.11646/zootaxa.3846.4.2 ea136b1c-dc96-4c41-b078-01ca553453a0 1175-5326 252519 71A80CC3-CDC1-4291-863B-FA7501D60AF5 Opeatocerata chaetohypandrialis sp. nov. ( Figs 47–57 ) Diagnosis . Tergites 3–6 with basal subrectangular and apical transversal brown spots ( Fig. 50 ); hypandium with long bristles at apex ( Fig. 57 ); phallus with large dorsal subapical appendix in lateral view ( Fig. 55 ) and spiniform projections laterally, best visualized in ventral view ( Fig. 56 ). Description . Male ( Fig. 47 ). Head : Face parallel-sided, dark brown with gray pruinescence visible in ventral view, about 4X longer than lower width. Ocellar tubercle protuberant, dark brown with gray puinescence; ocelli yellow. Scape and pedicel yellow with yellow bristles; postpedicel brown about 2X longer than pedicel; stylus about 2X longer than postpedicel. Proboscis yellow shorter than head height. Thorax yellow, shiny ( Fig. 47 ). Legs yellow, except for hind femur and tibia with black apical ring and all tarsomeres 4–5 black; hind tibia and tarsus with anterodorsal and posterodorsal rows of longer bristles. Wing ( Fig. 48 ) hyaline, pterostigma brown, conspicuous, about 2.5X longer than wide. Halter yellow. Abdomen yellow, shiny; tergites 3–6 with basal subrectangular and apical transversal brown spots ( Figs 49, 50 ); tergite 8 divided in two subrectangular plates; sternite 8 divided in two trapezoidal plates. Terminalia: Anterior cercus with a reclinate dorsal projection in lateral view ( Figs 49, 51 ), subrectangular in dorsal view ( Fig. 52 ); descendant plate subtrapezoidal in posterior view ( Fig. 53 ). Posterior cercus with rounded apex in lateral view ( Figs 49, 51 ); without dorsal projections ( Fig. 52 ). Hypoproct suboval in lateral view ( Fig. 51 ) and comma-shaped in posterior view ( Fig. 53 ). Epandrial with bilobate ventral lobe ( Figs 49, 51 ); spiniform bristles mesially on dorsal lobe and longer bristles apically on ventral lobe ( Fig. 51 ). Hypandrium longer than wide, with truncate apex and median sinus, with long bristles at apex ( Fig. 57 ). Phallus with narrower base, extending towards the apex, longer than hypandrium, with a larger dorsal subapical appendix in lateral view ( Fig. 55 ) and spiniform projections laterally in ventral view ( Fig. 56 ). Subepandrial sclerite wider than long, V-shaped ( Fig. 54 ). Bacilliform sclerite without folds and longer than subepandrial sclerite ( Fig. 54 ). Specimen length : 3.5 mm ; wing : 4.2 mm . Female . Unknown. Geographical distribution . Brazil (Pará) ( Fig. 211 ). Type material . HOLOTYPE ♂, labelled: Brasil , Pará, Santo A[ntonio] de Tauá. 07.iv.1975 . I.S. Gorayeb ( MPEG ). Paratypes : same data as holotype ( 2 ♂ , INPA ; 1 ♂ , MPEG ). Holotype condition . Good; wing mounted in microslide; abdomen in microtube with glycerin. Etymology . From the Greek chaeto (bristles), referring to the bristles present on the hypandrium. Remarks. Opeatocerata chaetohypandrialis sp. nov. differs from other species by the following characters: tergites 3–6 with basal subrectangular and apical transversal brown spots ( Fig. 50 ) (other species have paramedian spots on the tergites); hypandrium with bristles at apex ( Fig. 57 ) (other species without bristles on the hypandium); phallus with spiniform projections laterally ( Fig. 56 ) (in other species without spiniform projections laterally).