Dissomphalus contractus, Azevedo, 2003

Azevedo, C. O., 2003, Synopsis of the Neotropical Dissomphalus (Hymenoptera, Bethylidae), Zootaxa 338 (1), pp. 1-74 : 16-17

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).

Figures

FIGURES 1–10. 1–6, Dissomphalus lobicephalus sp. nov. 1, head and mesosoma, dorsal view; 2, mandible, frontal view; 3, metasoma, latero­dorsal view; 4, tubercle, lateral view; 5, genitalia, ventral view; 6, genitalia, dorsal view; 7–10, Dissomphalus contractus sp. nov. 7, head and mesosoma, dorsal view; 8, mandible, frontal view; 9, genitalia, ventral view; 10, genitalia, dorsal view. (Scale bars = 0.5 mm, except for figure 4 = 0.1 mm).