Pseudisobrachium acuminatum, 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 : 8-9

Pseudisobrachium acuminatum sp. nov. (Figs. 15-19)

Description.- Male. Body length 2.18 mm; LFW 1.74 mm. Color: head black; thorax dark castaneous, except pronotum light castaneous; metasoma dark castaneous; mandible light castaneous, teeth darker, antenna dark castaneous, scape and pedicel light castaneous; legs light castaneous; wings subhyaline, veins dark. Pubescence conspicuous.

Head (Fig. 15): mandible with 5 teeth (Fig. 16). Clypeus with trapezoidal median lobe, apical margin emarginate and angled, median carina arched in profile. First four antennal segments in a ratio of 24:9:25:18; segment III 3.28 X longer than thick, segment XI 3.0 X; flagellar pubescence subappressed, with some sparse erect setae. Frons coriaceous, punctures small and inconspicuous, WH 0.66 X LH, WF 0.74 X WH, WF 1.67 X HE; frontal angle of ocellar triangle acute, DAO 0.17 X WF; OOL 1.73 X WOT. Vertex straight, with rounded extremity; VOL 1.05 X HE. Temples divergent anteriorly. Occipital carina visible in dorsal view.

Mesosoma: pronotum and mesonotum coriaceous, punctured as frons; notauli present only anteriorly; scutellar disc coriaceous, punctures as frons. Propodeal disc 0.8 X as long as wide, 1.2 X as long as high, propodeum areolate, with longitudinal depression instead of median carina, lateral and posterior carinae absent. Mesopleuron coriaceous with flattened and slightly evident coriaceous callus. Fore wing with discoidal vein spectral, weakly pigmented, interstitial with median vein.

Genitalia (Fig. 17-19): paramere with ventral arm more than 3.0 X wider than dorsal arm, dorsal arm uniformly narrow; vannus with 6 grooves; aedeagus elliptical, with basal portion dilated, apex elongated.

Material examined.- HOLOTYPE: male, BRAZIL, Espírito Santo, Santa Teresa, Estacao Biologica de Santa Lucia , 23. VII.2001, sweeping, C.O. Azevedo & R. Kawada col. ( UFES). PARATYPES: BRAZIL, Espírito Santo, 13 males, Santa Teresa, Estacao Biologica de Santa Lucia , 23.II-10.XII.2001, sweeping, C.O. Azevedo & R. Kawada col. ( UFES) ; 2 males, Cariacica, Reserva Biologica de Duas Bocas , 09. IX. 1996- 07.I.1997, sweeping, C.O. Azevedo & H. S. Sá col. ( UFES) .

Variations.-Body lighter; head narrower or wider; genitalia with ventral arm of parameres ramus narrower or wider; punctures irregular.

Discussion.-This species runs to P. brunneum Evans , 1961, from Mexico in the North and Central American key by Evans (1961). However P. acuminatum has clypeus with trapezoidal median lobe, temples divergent anteriorly, aedeagus with basal dilated portion; whereas in P. brunneum the clypeus is truncated, the temples are almost parallel, the body is shining and the aedeagus has a central dilated portion.

Etymology.-The specific epithet refers the acute apex of the parameres.

Distribution.-Brazil ( Espírito Santo).