Pseudisobrachium rotundum Waichert & Azevedo, 2004, sp. nov.

Pseudisobrachium rotundum sp. nov. (Figs. 33-37)

Description.-Male. Body length 3.18 mm; LFW 2.26 mm. Color: head and thorax black; metasoma dark castaneous; mandible light castaneous, lower teeth dark; antenna and legs light castaneous; wings subhyaline, veins dark castaneous. Pubescence conspic-uous and abundant.

Head (Fig. 33): mandible with 5 teeth (Fig. 34). Clypeus with rounded median lobe, median carina complete. First four antennal segments in a ratio of 24:9:15:13, segment III 2.0 X longer than thick, segment XI 2.25 X; flagellar pubescence subappressed, with some erect setae. Frons strongly coriaceous, punctures inconspicuous. WH 1.08 X LH, WF 0.63 X WH, WF 1.37 X HE; DAO 0.15 X WF, OOL 1.27 X WOT; frontal angle of ocellar triangle ocellar right. VOL slightly shorter than HE. Vertex straight, with rounded corners. Temples divergent anteriorly.

Mesosoma: pronotum and mesonotum coriaceous, pronotal disc short, with an anterior transverse elevation, punctures irregular and shallow; notauli absent; parapsidal furrows complete and shallow; scutellar disc coriaceous, punctures as mesoscutum. Propodeal disc 0.85 X as long as wide, 1.15 X as long as high, basal triangle striated, median carina incomplete, posterior carina absent, declivity strigulate, lateral of propodeum coriaceous. Mesopleuron coriaceous, punctures large and deep, stronger around the callus, which is large and shining. Fore wing with discoidal vein spectral, interstitial with median vein.

Genitalia (Figs. 35-37): paramere elongate, ventral arm approximately 3.0 X wider than dorsal arm; vannus with 5 grooves; aedeagus lozenge, apex emarginated, base progressively narrow.

Material examined.- HOLOTYPE: male, BRAZIL, Espírito Santo, Cariacica, Reserva Biológica de Duas Bocas, 26. XII.1996, sweeping, C.O. Azevedo col. (UFES). PARATYPE: BRAZIL, Espírito Santo, 01 male, Santa Teresa, Estação Biológica de Santa Lúcia, 27.IX.2001, sweeping, C.O. Azevedo & R. Kawada col. (UFES); 21 males, Cariacica, Reserva Biológica de Duas Bocas, 02. IX. 1996- 26.XII.1996, sweeping, C.O. Azevedo & H. S. Sá col. (UFES).

Discussion.- P. persimile Evans, 1961, from United States, California, is externally similar to this species, however P. persimile has 4 mandibular teeth, notauli impressed up to half of mesoscutum, propodeal disc longer, whereas this species has mandible with 5 teeth, notauli absent, and propodeal disc shorter.

Etymology.-The specific epithet refers to the rounded median lobe of clypeus.

Distribution.-Brazil (Espírito Santo).