Dissomphalus gordus sp. nov. (Figs. 82–87)

Description. — Male. Body length 4.5 mm; LFW 3.12 mm. Color: head and mesosoma black; metasoma, clypeus, mandible and antennae dark castaneous, scape lighter; legs castaneous; palpi light castaneous; wings subhyaline.

Head: mandible bidentate (Fig. 82). Clypeus trapezoidal (Fig. 83). First four antennal segments in a ratio of 13:5:5:6, segment XI 1.43 X as long as broad, sensillae conspicuous. Frons strongly coriaceous, punctures inconspicuous, shallow, separated by 0.3–1.5 X their diameters. LH 0.98 X WH; WF 0.61 X WH; 1.38 X HE; OOL 1.14 X WOT; DAO 0.36 X WOT; posterior ocelli distant from the vertex crest 1.2 X DAO, frontal angle of ocellar triangle acute. Vertex straight, corners rounded. VOL 0.48 X HE.

Mesosoma: thorax coriaceous as frons. Pronotal disc 0.64 X length of mesoscutum. Propodeal disc 0.67 X as long as wide, with small polished area posteriorly. Fore femur 3.3 X as long as thick.

Metasoma: tergite II with pair of elliptical pits, distant each other 5.0 X their length, distant from posterior margin of tergite I 0.67 X their length, closer to the lateral margin than the middle, placed at the inner area of rounded depression, inner part of each pit covered by translucid sclerite (Fig. 84), so that the hole is hemispheric and inclined, from which emerges small tuft of hairs (Fig. 85). Hypopygium with median stalk 1.43 X as long as plate, posterior margin straight. Genitalia (Fig. 86–87): paramere wider medially, with apex as a triangular expansion, dorsal margin convex, ventral margin straight; aedeagus entirely gibbous, ventral ramus much shorter than dorsal body, laminar, surface inclined, basal half fused, apical half narrowing gradually to the rounded apex in lateral view; dorsal body with two pairs of apical lobes, outer pair laminar apically, surface vertical, apex rounded in lateral view, with rim hairy below, inner pair membranous, stout and hairy; basal process as a stout expansion, large and somewhat membranous, basal bar dilated above; apodeme not extending beyond the elliptical genital ring.

Material examined. — HOLOTYPE: male, BRAZIL, Paraná, Antonina, Reserva Sapitanduva, 29.IX.1987; Malaise trap, Profaupar Survey (DZUP) . PARATYPES: BRAZIL, Rio de Janeiro, 4 males, Rio de Janeiro, I.1972, M. Alvarenga col. (PMAE); São Paulo, 1 male, São Carlos, Canchim Farm, forest, 7.XI.1985, sweeping, A. Souza col. (DCBU) ; 2 males, Salesopólis, Boraceia Biological Station, 5.VII–6.IX.1997, Malaise trap, C. I. Yamamoto col. (MSZP) ; Paraná, 3 males, Antonina, Reserva Sapitanduva, 4.VIII.1986 – 14.IX.1987, 1 male, Colombo, Embrapa, Br 476. Km 20, 3.XI.1986 – 23.II.1987, Malaise trap, Profaupar Survey (DZUP) .

Variation. — Metasoma darker, depression of tergal processes deeper.

Etymology. — The specific epithet refers to the aedeagus gibbous.

Distribution. — Brazil (Rio de Janeiro, São Paulo, Paraná).