Opeatocerata ampullaria sp. nov.

(Figs 17–25)

Diagnosis. Yellow species; descendant plate of the anterior cercus hourglass-shaped in posterior view (Fig. 22); phallus with narrow base, wider at mostly, with large dorsal subapical appendix (Fig. 24).

Description. Male (Fig. 17). Head: Face of sides slightly diverging toward the proboscis, brown with gray pruinescence visible in ventral view, about 5X longer than lower width. Ocellar tubercle protruberant, brown with brown pruinescence; ocelli yellow. Antenna yellow with black bristles; postpedicel about 2X longer than pedicel; stylus about 2X longer than postpedicel. Proboscis yellow shorter than head height. Thorax yellow, shiny (Fig. 17). Legs yellow, except brown apical ring on hind femur and all tarsomeres 4–5 brown; hind tibia and tarsus with anterodorsal and posterodorsal rows of longer bristles. Wing (Fig. 18) hyaline; pterostigma brown, conspicuous, about 2.8X longer than wide. Halter pale yellow. Abdomen yellow, shiny (Figs 17, 19); tergite 8 divided in two subrectangular plates; sternite 8 divided in two subrectangular plates. Terminalia: Anterior cercus with proclinate dorsal projection in lateral view (Fig. 20), concave in dorsal view (Fig. 21); descendant plate hourglass-shaped in posterior view (Fig. 22). Posterior cercus with acuminate apex in lateral view (Fig. 20), without dorsal projections (Fig. 21). Hypoproct subtriangular in lateral view (Fig. 13) and comma-shaped in posterior view (Fig. 22). Epandrial ventral lobe slightly bilobed at apex (Fig. 20); spiniform bristles mesially on dorsal lobe and longer bristles apically on ventral lobe (Fig. 20). Hypandrium longer than wide, with rounded apex and median sinus (Fig. 25), without long bristles. Phallus with narrow base, wider at mostly, longer than hypandrium with large dorsal subapical appendix (Fig. 24). Subepandrial sclerite wider than long, U-shaped (Fig. 23). Bacilliform sclerite folded and longer than the subepandrial sclerite (Fig. 23). Specimen length: 3.3 mm, wing length: 3.9 mm. Female. Unknown.

Geographical distribution. Brazil (Amazonas) (Fig. 211).

Type material. HOLOTYPE ♂, labelled: Brasil, Amazonas, Manaus, C[ampus] Univers[itário] v. 1979. J.A. Rafael / Armadilha de Malaise (INPA). Paratypes: Brazil, Amazonas. Manaus, PDBFF /WWF. Proj[eto] Bert Klein / x.1985, Malaise / Reserva 1301 (6 ♂, INPA). Idem, Reserva 1210 (1 ♂, MPEG). Manaus, C[ampus] Univ[ersitário]. iii.1979, J.A. Rafael (1 ♂, MZUSP). Idem, v.1979, J.A. Rafael (1 ♂, INPA) / Malaise. Idem, vi.1979, J.A. Rafael (1 ♂, INPA). Idem, vii.1979, J.A. Rafael (1 ♂, MPEG). Manaus, F[azenda] Esteio, BR–174, Km 41 ZF-3/ 24–27.viii.1993. F. Xavier (2 ♂, MZUSP). Manaus, R[eserva] Ducke. 16–17.iii.1993. Varredura em mata. João Vidal (1 ♂, INPA). Idem, 29.v.1990. Malaise. Vidal-Rocha (1 ♂, INPA). Manaus, BR 174 ZF-6, Km 41 / 04–12.ix.1991. Francisco Xavier (1 ♂, INPA).

Holotype condition. Right wing on microslide; abdomen in microtube with glycerin.

Etymology. From the Latin ampulla, in reference to the hourglass-shaped descendant plate of the anterior cercus.

Variation. Body length range: 3.2–4.1 mm. Some paratypes with brown postpedicel and stylus.

Remarks. Opeatocerata ampullaria sp. nov. differs from other species by the descendant plate of anterior cercus hourglass-shaped in posterior view (Fig. 22), which is subrectangular, subtriangular or with latero-ventral projection in other species.