Pseudisobrachium filum, 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 : 9-10

Pseudisobrachium filum sp. nov. (Figs. 20-24)

Description.-Male. Body length 4.65 mm; LFW 3.52 mm. Color: head black, mesothorax dark castaneous, pronotal disc light castaneous anteriorly, propodeum and metasoma dark castaneous, clypeus and mandible light castaneous, teeth dark; antenna light castaneous, last flagellomeres darker; wings subhyaline, veins dark castaneous. Pubescence conspicuous.

Head (Fig. 20): mandible with 5 sharpened teeth (Fig. 21). Clypeus with trapezoidal median lobe, apical margin weakly emarginate and angled, lateral margin crenulate. First four antennal segments in a ratio of about 15:7:12:11; antenna thick, segment III 2.45 X longer than thick, segment XI 2.11 X; flagellar pubescence subappressed, with some erect setae. Frons strongly coriaceous, punctures small and inconspicuous. WH 0.98 X LH, WF 0.51 X WH, WF 1.05 X HE; ocellar triangle with right frontal angle, DAO 0.24 X WF; OOL 1.4 X WOT. VOL 0.8 X HE. Vertex broadly rounded. Temples divergent anteriorly. Occipital carina partially visible in dorsal view.

Mesosoma: pronotum and mesoscutum coriaceous, punctures very small and inconspicuous; notauli very short, present only in the anterior ninth of mesoscutum, parapsidal furrow almost complete; scutellar disc with the same texture as mesoscutum. Propodeal disc 0.86 X as long as wide, 1.2 X as long as high, basal triangle striate, posterior portion and declivity areolate, median and posterior carinae absent, lateral carina present, lateral portions of propodeum coriaceous. Mesopleuron coriaceous, with an elongate and coriaceous callus, surrounded by pits. Fore wing with discoidal vein not pigmented, not interstitial with median vein.

Genitalia (Figs. 22-24): paramere with ventral arm 1.5 X wider than dorsal arm sinuate; vannus with 5 grooves; aedeagus elliptical, apex laminar, surface subvertical, with a pair of filaments turned upward.

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, 166 males, Santa Teresa, Estacao Biologica de Santa Lucia , 30.I-10.XII.2001, sweeping, C.O. Azevedo & R. Kawada col. ( UFES) ; 6 males, Cariacica, Reserva Biologica de Duas Bocas , 26. XI. 1996- 25.II.1997, sweeping, C.O. Azevedo & H. S. Sá col. ( UFES) .

Variation.- Size larger or smaller, body lighter, head darker, antenna darker, flagellomeres darker or lighter, pronotum lighter, antenna thinner; genitalia with ramus of parameres narrower or wider; mesopleuron irregularly punctured; basal triangle of propodeal disc more strongly striate.

Discussion.-The general structures of this species is similar to P. acuminatum , but in P. filum the head is subparallel behind the eyes, occipital carina not visible in dorsal view, the pronotal disc is short and wide, the basal triangle of propodeal disc is weakly striate, the ventral arm of paramere sharpener, the aedeagus wider, the central portion enlarged, and has a pair of filaments in the apex of aedeagus, whereas in P. acuminatum the head behind the eyes is divergent anteriorly, occipital carina visible in dorsal view, the pronotal disc is narrow anteriorly, the basal triangle of propodeal disc is areolate, the ventral arm of paramere narrow and the aedeagus is narrow, with basal portion enlarged, and without a pair of filaments in the apex of aedeagus.

Etymology.-The specific epithet refers to the filaments of aedeagus.

Distribution.-Brazil ( Espírito Santo).