Debilos umentum Scherrer, 2012

Scherrer, Marcus V. & Aguiar, Alexandre P., 2012, 3469, Zootaxa 3469, pp. 1-76 : 47-48

Debilos umentum Scherrer , sp. nov.

( Figs 17, 68, 108, 153)

Description. Female. Fore wing 4.9 mm. Head: Antenna with 25 flagellomeres. Clypeus smooth, moderately convex, regularly curved, CWH 1.90; MWC 0.67, MLW 1.86, MWW 0.50; malar space moderately long, MSM 0.93; supra-antennal area with very thin, inconspicuous, median, longitudinal line; minimum distance from eye margin to occipital carina laterally approximately same width of mandible base.

Mesosoma ( Fig. 108). Pronotum lateral portion next to collar inconspicuously strigate-rugose, next to mesopleuron inconspicuously corrugated, epomia faint; notaulus faintly impressed, inconspicuously, minutely corrugated, especially anteriorly, not reaching middle of mesoscutum; mesopleuron almost entirely faintly substrigate-rugose, epicnemial carina restricted to ventral 0.8 of mesopleuron, posteriorly inconspicuously, sparsely corrugated; mesopleural groove faintly, sparsely corrugated; sternaulus anterior 0.8 faintly corrugated; postpectal carina medially straight; metapleuron, subapical fovea shallow, subcircular; pleural carina stout; propodeum anterior area short, PLL 0.66, anterior transverse carina distinct, complete, medially distinctly arched forwards, posterior area strigulate-rugulose, with faint ridges medially slightly arched backwards, spiracle distinctly elliptic, SWL 1.50, propodeal apophyses long, thorn-shaped, AHD 2.57. Legs ( Fig. 68): Hind t4 posterior lobe about 0.38 × as long as anterior lobe. Fore wing vein (Rs+M)b nearly straight or perfectly straight, limit with crossvein 1m-cu distinct, ramellus absent; vein Rs&1M uniformly slightly curved; crossvein 1cu-a posteriorly slightly convex, arising distinctly apicad vein Rs&1M, by about 0.2 × 1cu-a length, angle with vein M+Cu about 90 degrees; vein 2Cua much shorter than crossvein 2cu-a, FWC 0.39; areolet small, APH 0.67; vein 2Ma approximately as long as vein 2Mb; vein 2Mb tubular; crossvein 2m-cu with bulla short, about 0.2 × as long as vein length or shorter; vein 2Rsb sinuous. Hind wing vein 2-1A moderately long, reaching about 0.6 × the distance to wing margin, HWC 1.47.

Metasoma ( Fig. 108). T1 petiole basal half smooth towards base, apical half, postpetiole coriarious-punctulate, except pospetiole apical parts centrally smooth, sparsely punctulate, spiracle at about basal 0.7, inconspicuously prominent, T1LW 2.74, T1WW 2.72, T1GL 0.37; T2 moderately short, apically robust, T2T1L 0.75, thyridium subcircular ( Fig. 17), T2LW 0.82, T2WW 2.36. Ovipositor approximately straight, OST 0.47, dorsal valve with nodus absent, notch absent; ventral valve tip with inconspicuous serrations restricted to very tip.

Color. Head black, mesosoma and legs brown (134, 083, 044), metasoma mostly dark brown (066, 051, 055). Head: Scape ventrally lightest; pedicel and flagellomeres 1, 5–9 dorsally white; supra-antennal longitudinal line with brownish tint; mouth parts whitish (218, 216, 195), except mandible apex blackish. Mesosoma: Collar medially and propodeal apophyses white; propleuron and mesosternum blackish. Legs: Fore and mid coxae and trochanters white, except fore trochanter dorsal mark and mid trochanter dorsally almost entirely dark brown; fore femur ventrally, fore and mid tibiae anteriorly and posteriorly, and hind tibia basal 0.1 pale yellow (241, 224, 144) to whitish; mid trochantellus and hind leg dark brown, except coxa apical margin white, and trochanter apical margin dorsally, femur ventrally and tarsus, trochantellus ventrally and femur basal 0.1 lightest. Fore wing with one distinct dark spot, on apical half of cell 3M and 1+2R1, and surrounding areas. Metasoma: Basally blackish, changing to dark brownish (086, 050, 031) towards apex; T1 apical 0.2 and T2 apical 0.3 with white stripe, T2 stripe central 0.6–0.7 anteriorly concave, concavity apex reaching T2 apical margin; T3–7 darkest towards base; T3–5 apical margin lightest; T6 apical margin, T7 mostly and T8 entirely dorsally, and sternites medially white; ovipositor sheath dark brown, except basal 0.75 ventrally whitish; ovipositor light brown (187, 144, 084).

Male. Unknown.

Variability. Unknown.

Comments. Included in the D. typurum species group (see item Species Delimitation). Within this group, only D. umentum , D. aserum , D. anokum , and D. makirum have the hind coxa entirely dark brown to blackish. However, D. umentum is the most easily recognizable among these species, being differentiated by the combination of flagellomere 1 dorsally, and fore and mid coxae entirely white, plus the hind tarsus without white marks.

Etymology. From the Carib word úmenty, meaning circle, in reference to thyridium subcircular in this species.

Distribution. Ecuador. Recorded from one locality of Sucumbios: Napo River, Sacha Lodge (at the positions 0.5°S 76.5°W) ( Fig. 153).

Material Examined. Holotype ♀ from ECUADOR, Sucumbios, Napo River, Sacha Lodge , 0.5°S 76.5°W, 270m, 13–23.VI.1994, Malaise trap, PHibbs leg ( CNCI). Right antenna tip lacking, otherwise in good shape, mounted on triangle point.