Dissomphalus curviventris sp. nov. (Figs. 41–43)

Description. — Male. Body length 4.38 mm; LFW 3.0 mm. Color: head and mesosoma black; metasoma, clypeus, mandible, antenna and legs dark castaneous; palpi castaneous; wings subhyaline.

Head: mandible bidentate. Clypeus trapezoidal. First four antennal segments in a ratio of 18:5:5:7, segment XI 2.0 X as long as broad. Frons strongly coriaceous, punctures large, shallow, separated by 0.1–1.0 X their diameters. LH 1.05 X WH; WF 0.64 X WH; 1.44 X HE; OOL 1.32 X WOT; DAO 0.32 X WOT; posterior ocelli distant from the vertex crest 1.8 X DAO, frontal angle of ocellar triangle acute. Vertex slightly convex, corners rounded. VOL 0.64 X HE.

Mesosoma: thorax coriaceous and punctated as frons. Pronotal disc 0.5 X length of mesoscutum. Propodeal disc 0.74 X as long as wide. Fore femur 3.5 X as long as thick.

Metasoma: tergite II with pair of very inconspicuous and shallow lateral depressions, with some lateral hairs, each one with tubercle flat­topped, with pit on the top, with tuft of hairs, tubercles slightly closer to the median line than the lateral margin of tergite II. Hypopygium with median stalk 2.5 X as long as plate, posterior margin straight. Genitalia (Figs. 41–42): paramere longer than basiparamere, apex thin, slightly curved inward, dorsal margin straight and ill­developed, ventral margin concave above; volsella with cuspis with apex acute, digitus with large basal projection; aedeagus with ventral ramus slightly shorter than dorsal body, laminar, surface vertical, apex converging, ramus thin with apex wide and rounded in lateral view (Fig. 43), apex somewhat folded; dorsal body with two pairs of apical lobes, outer pair wide and rounded in lateral view, dorsal margin convex and with surface folded medially, ventral margin serrated (Fig. 43), inner pairs stout, membranous and hairy, basal bar surpassing the base of outer lobe; apodeme extending beyond the elliptical genital ring.

Material examined. — Holotype: 1 male, BRAZIL, Paraná, São José dos Pinhais, Serra do Mar, Br277, km 54, 11.VIII.1986, Malaise trap, Profaupar survey (DZUP). PARATYPES: BRAZIL, São Paulo, 1 male, Serra da Bocaina, XI.1969, M. Alvarenga col. (PMAE); Paraná, 1 male, Jundiaí do Sul, Monte Verde Farm, 1 male, Colombo, Embrapa, Br 476, km 20, 1 male, Fênix, State Reserve ITCF, 46 males, same locality of type, São José dos Pinhais, Serra do Mar, Br 277, km 54, 1.X.1984 – 4.VII.1988, Malaise trap, CIIF or Profaupar survey (DZUP).

Variation. — Head wider, metasomal tergite II with depression slightly deeper, tufts larger, with longer hairs.

Etymology. — The specific epithet refers to the ventral ramus of aedeagus with apex folded.

Distribution. — Brazil (São Paulo, Paraná).