Dissomphalus arteobius Brito & Azevedo, sp. nov.

(Figs 26, 57, 88, 209–210)

Description. Male. Body length 3.13 mm. Color: head dark castaneous; mesosoma and metasoma castaneous. Head (Fig. 26). Mandible with two distal teeth. Median clypeal lobe ill-defined, with one angulate tooth; median clypeal carina low in profile, incomplete apically, straight in profile or nearly so. Frons weakly coriaceous and punctures large. Vertex crest straight. Pronotal disc weakly coriaceous; anterior margin ecarinate. Metasoma (Fig. 57). Tergal proces with lateral, shallow, subcircular and small depression, without tubercle, with very short tuft of setae. Posterior hypopygeal margin straight or nearly so (Fig. 88). Genitalia (Figs 209–210): paramere with dorsal margin entirely wide; apical margin rounded. Aedeagal ventral ramus shorter than dorsal body, evenly narrow; cross section laminar; surface subvertical; inner margin concave; outer margin sinuous; apex short, simple, parallel; additional inner ramus absent; basal stub short and very narrow. Aedeagal dorsal body with two pairs of apical lobes; outer lobe long, horizontal and narrow, with apical margin abruptly acute and ventrad; inner pair stout, membranous and setose. Apodeme extending beyond genital ring.

Variations. Mesosoma dark castaneous; median clypeal tooth shorter; depression of tergal process very shallow.

Remarks. This species is easily recognized by having the very long basiparamere about 2 × the size of the paramere. This characteristic does not have in other species in Dissomphalus . The paramere is wide and short, the apex of the apical lobe of the aedeagal dorsal body is articulated and the eyes are bulging.

Material examined. Holotype, ♂, PANAMA, Darién Pr [ovincia]: P[arque] N[acional] Darién, Pirre, Est[ación] Rancho Frio, 80 m, [08°00'N, 77°45'W], 16 nov–17 ene 2001, Malaise, R. Cambra, A. Santos [col.] (MIUP) . Paratypes: 2♂, same data as holotype; 3♂, same of holotype except 1000m, 21 mar–4 ab 2000 (2♂), 580m, 21 mar–4 ab 2000 (1♂) (MIUP).

Distribution (Fig. 227). Panama (Darién).