Pseudisobrachium cuspidatum, 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 : 12-13

Pseudisobrachium cuspidatum sp. nov. (Figs. 29-32)

Description.-Male. Body length 5.08 mm; LFW 3.36 mm. Color: head and thorax black, metasoma dark castaneous; mandible light castaneous, teeth dark; antenna dark castaneous, two anterior segments light castaneous; legs light castaneous; wings subhyaline, veins dark castaneous. Pubescence conspicuous.

Head (Fig. 29): mandible with 5 teeth (Fig. 30). Clypeus with trapezoidal median lobe, apical margin faintly truncate, convex medially, lateral corners angled and prominent. First four antennal segments in a ratio of about 23:6:12:11, segment III 2.5 X longer than thick, segment XI 1.8 X, flagellar pubescence suberect, with some erect setae. Frons coriaceous, punctures small and conspicuous. WH 0.98 X LH, WF 0.67 X WH, WF 1.46 X HE; ocellar triangle compact, with acute frontal angle, DAO 0.14 X WF; OOL 1.54 X WOT; VOL 1.04 X HE. Vertex straight, with corners rounded. Temples almost parallel.

Mesosoma: pronotum and mesonotum coriaceous, with small, irregular and conspicuous punctures, mesonotum more strongly punctured; notauli narrow, occupying less than the anterior fourth of mesoscutum; parapsidal furrows almost complete, except for only a small anterior portion; scutellar disc smooth in central portion, laterally with deep punctures. Propodeal disc 0.94 X as long as wide, 1.37 X as long as high, basal triangle striated, median carina almost complete, declivity with transverse ridge, posterior carina absent, lateral carina present, lateral of propodeum very weakly aciculate. Mesopleuron with a large and smooth callus, contrasting with the rest which is coriaceous and irregularly punctured. Fore wing with discoidal vein spectral, weakly pigmented at the base, interstitial with median vein.

Genitalia (Figs. 31-32): paramere with ventral arm 2.5 X wider than dorsal arm, dorsal arm uniformly narrow; vannus with 6 inclined grooves; aedeagus elliptical, apex deeply emarginate, base large.

Material examined.- HOLOTYPE: male, BRAZIL, Espírito Santo, Santa Teresa, Estacao Biologica de Santa Lucia , 10. X.1996, sweeping, C.O. Azevedo col. ( UFES). PARATYPES: BRAZIL, Espírito Santo, 15 males, Santa Teresa, Estacao Biologica de Santa Lucia , 30.I-31.V.2001, sweeping, C.O. Azevedo & R. Kawada col. ( UFES) ; 23 males, Cariacica, Reserva Biologica de Duas Bocas , 10. X. 1996- 25.III.1997, sweeping, C.O. Azevedo & H. S. Sá col. ( UFES) .

Variations. - Antenna and legs can be totally dark; some specimens are more shining; wider head; pronotal disc can be elongate or short anteriorly; notauli apparently absent; parapsidal furrow thin; lateral of propodeum more aciculate, mesopleuron coriaceous; basal triangle of propodeal disc with distinct transverse ridge; paramere wider.

Discussion.-This species is similar to P. tridens Evans , 1969, from northern Argentina, but P. cuspidatum has the upper tooth of mandible sharp and narrow, median lobe of clypeus with angled lateral corners, and aedeagus wide medially, whereas P. tridens has the upper tooth of mandible rounded and broad, median lobe of clypeus with not angled corners, and aedeagus little wide medially. The species is also similar to P. ternarium Evans , 1969, from northern Argentina, but here the head is subparallel behind the dorsal edges of eyes, and median lobe of clypeus with angled lateral corners, whereas in P. ternarium the head is divergent anteriorly behind the edges of the eyes, and median lobe of clypeus with rounded lateral corners.

Etymology.-The specific epithet refers to the sharp corners of the clypeus.

Distribution.-Brazil ( Espírito Santo).