Leptostigma brevilatum

Description. Holotype. Body length not known by preservation. Body as preserved (including head with antenna, thorax, femora, tibiae, abdominal base) and pterostigma dark, membrane lightly infuscate throughout, tarsal fragments (at least hind tarsomeres 1 – 3) darkened. Head (interpretation tentative by imperfect preservation) wider than long, with compound eyes oval, rather short, converging below, rather close to mandibles; ocelli not known, toruli close to each other, touching clypeus; clypeus small, excised apically; labrum oval, narrower and slightly shorter than clypeus; temples not inflated, scarcely exceeding eye contour. Antenna apparently with 9 antennomeres; scape, pedicel small, poorly preserved; flagellomeres possibly gradually becoming shorter, wider (but precise length sometimes obscure) except apical two of similar length; club somewhat unclear, apparently 3 - segmented, short, rounded apically. Thorax poorly known by preservation, with notauli and median longitudinal mesonotal sulcus distinct, meeting well before transverse scutellum. Forewing length 13 (holotype) – 17 mm, maximum width 4 – 5 mm, length / width: 3.1 – 3.3. Pterostigma narrow, similar to width of C-R; R + M shorter than 1 - M; 2 r-rs before middle of cell 3 rm (near middle in UWBM 54840); 2 r-rm distinctly curved (F- 1182 with aberrant short stub near middle in both wings), joins Rs about same level as 2 m-cu joining M, joining M behind 2 m-cu for more than half of 2 r-m length (in F- 1182, slightly less than that in right wing); 1 - M straight or almost so; 3 r-m almost straight; cell 1 mcu with M and 1 m-cu distinctly to slightly (in GSC 142840) diverging toward anterior margin, aberrant (split) in left wing of F- 1182; cell 2 mcu with M usually shorter than 1 m-cu (as long as that in GSC 142840, slightly longer than that in F- 1182); 2 m-cu curved distinctly toward base (weakly so in GSC 142840); cu-a distinctly postfurcal; anal cells meet at crossvein. Hind wing with 3 r-m, m-cu, cu-a present, 3 r-m slightly more than its own length from m-cu; cu-a before middle of cell mcu, more than for its length before m-cu (aberrantly two cu-a present in holotype placed before and behind middle of cell mcu: which is true crossvein unclear). Legs long, narrow, hind femur widest subbasally, 2.9 times as long as wide, with lower margin smooth, hind tibia ca. 6 times as long as wide apically, hind apical spur long (as long as basitarsus, almost 0.4 times as long as tibia, Fig 9 B), sharp, tarsomere 1 – 3 length ratio 1: 0.7: 0.45 (in GSC 142840, femora, tibiae apparently narrower, but difficult to measure), with claw apparently simple.