Pseudisobrachium ventriosum, Waichert, C. & Azevedo, C. O., 2004

Waichert, C. & Azevedo, C. O., 2004, Fourteen new species of Pseudisobrachium (Hymenoptera, Bethylidae) from Atlantic rain forest of Espírito Santo, Brazil., Zootaxa 661, pp. 1-22 : 2-5

Pseudisobrachium ventriosum sp. nov. (Figs. 1-5)

Description.-Male. Body length: 5.72 mm; LFW 3.84 mm. Color: head and thorax black, metasoma dark castaneous; mandible light castaneous, teeth darker; antenna light castaneous, base of scape dark castaneous; legs light castaneous; wings subhyaline, veins dark castaneous. Pubescence slightly evident.

Head (Fig. 1): mandible with four teeth (Fig. 2), the uppermost 2 short and almost fused, being the uppermost larger, the lower tooth sharpened and projected. Clypeus with trapezoidal median lobe, apical margin somewhat concave, median carina divided in two apically, reaching the corners of the lobe. First four antennal segments in a ratio of about 25:5:18:15; segment III 1.75 X longer than thick, segment XI 2.16 X; flagellar pubescence subappressed, with sparse erect setae. Frons polished, punctures deep and conspicuous. WH 1.0 X LH, WF 0.65 X WH, WF 1.32 X HE; ocellar triangle with acute frontal angle, DAO 0.14 X WF; OOL 1.10 X WOT. Vertex straight, corners broadly rounded. VOL 0.65 X HE. Temples divergent anteriorly.

Mesosoma: pronotum and mesonotum polished, only weakly shining, punctures sparser than on frons. Notauli narrow, short, impressed only on the fourth anterior of mesoscutum; parapsidal furrows strong, absent anteriorly. Scutellar disc polished, punctures conspicuous, small and very sparse. Propodeal disc approximately 1.0 X as long as wide, 1.6 X as long as high, basal triangle strongly striate, median carina incomplete, posterior carina absent, declivity striated, without median carina, lateral carina somewhat striated, lateral side of propodeum polished. Mesopleuron with deep and conspicuous punctures, callus large and polished, occupying almost the total of mesopleuron. Fore wing with discoidal vein spectral, weakly pigmented at the base, interstitial with median vein.

Genitalia (Figs. 3-5): paramere with ventral arm more than 2.0 X wider than dorsal arm, dorsal arm abruptly narrow apically, ventral arm with sides almost parallel converging to a sharpened apex; vannus with four grooves; aedeagus wide, elliptical, apex directed for downward, base of aedeagus narrow.

Material examined.- HOLOTYPE: male, BRAZIL, Espírito Santo, Santa Teresa, Estacao Biologica de Santa Lucia , 23. IV.2001, sweeping, C.O. Azevedo & R. Kawada col. ( UFES). PARATYPES: BRAZIL, Espírito Santo, 7 males, Santa Teresa, Estacao Biologica de Santa Lucia , 30.I-31.V.2001, sweeping, C.O. Azevedo & R. Kawada col. ( UFES) ; 24 males, Cariacica, Reserva Biologica de Duas Bocas , 04. X. 1996- 19.I.1997, sweeping, C.O. Azevedo & H. S. Sá col. ( UFES) .

Variation.- Some specimens have the second tooth of mandible less extended forward; temples more or less divergent anteriorly; notauli in some specimens is as a series of joined small punctures, absent on posterior half of mesoscutum.

Discussion.-This species is similar to P. coxalis (Cameron , 1888) from Panama in having the median lobe of the clypeus concave apically and the aedeagus with ventral lobe developed, however in the former the ventral lobe of aedeagus is less developed. This species is also similar to P. boliviense Kieffer , 1910, from Bolivia, but in the former the notauli are strongly impressed and the carinae of propodeal disc are weakly impressed, whereas in the later the notauli are weakly impressed and the carinae of propodeal disc are strongly impressed.

Etymology.-The specific epithet refers to the dilated ventral surface of aedeagus. Distribution.-Brazil ( Espírito Santo).