Dissomphalus contractus sp. nov. (Figs. 7–10)

Description. — Male. Body length 2.03 mm; LFW 1.65 mm. Color: castaneous, mesosoma slightly lighter; wings hyaline.

Head (Fig. 7): mandible very long, overlapping more than the apical half of opposite mandible, slender, wider medially, bidentate, teeth far from each other; upper margin angulate (Fig. 8). Clypeus broadly awkward projected forward, with conspicuous median tooth, median carina conspicuous. First four antennal segments in a ratio of 20:7:6:6, segment XI 2.16 X as long as broad. Eye with sparse hairs. Frons weakly coriaceous, punctures shallow, small, inconspicuous. Head wider than thorax, with sides diverging below, 1.23 X as wide as long; WF 0.74 X WH; WF 2.47 X HE; OOL 2.29 X WOT; DAO 0.43 X WOT; posterior ocelli distant from the vertex crest 3.0 X DAO. Vertex slightly concave medially, corners broadly rounded, occipital carina very weak, present only in dorsal median. VOL 1.11 X HE.

Mesosoma (Fig. 7): thorax with same texture and punctures as on frons. Pronotal disc 1.06 X length of mesoscutum. Propodeal disc 0.67 X as long as wide, constricted anteriorly on the sides, coriaceous, except polished posteriorly, without discal and posterior carinae; declivity without median carina. Pleurosternum with pair of small horns on the posterior margin. Fore femur 2.36 X as long as thick.

Metasoma: tergite II without processes. Hypopygium posterior margin straight. Genitalia (Figs. 9–10): paramere with apex rounded and arched inward, dorsal margin convex; aedeagus with ventral ramus much shorter than dorsal body, laminar, horizontal, wide, apex rounded; dorsal body simple, with pair of apical lobes, stout, membranous, apex rounded, inner surface hairy; apodeme extending beyond the elliptical genital ring.

Material examined. — HOLOTYPE: male, BRAZIL, Amazonas, Manaus, Reserve 1208, 14.I.1986, Malaise trap, B. Klein col. (INPA) . PARATYPES: BRAZIL, Amazonas, 1 male, Manaus, Reserve Ducke, 15.IV.1992, glue trap, 1m, Vidal & Vidal col. (INPA) ; 2 males, Estirão do Equador, Rio Javari, IX.1979, M. Alvarenga col. (CNCI) .

Variation. — Body shorter, lighter.

Comments. — This striking new species has peculiar character as mandible very long and anterior constriction on the sides of propodeal disc.

Etymology. — The specific epithet refers to the constriction on the propodeal disc.

Distribution. — Brazil (Amazonas).