Probles (Euporizon) proshchalykini, Khalaim, 2019

Khalaim, A. I., 2019, Four new species of the genus Probles Förster (Hymenoptera: Ichneumonidae: Tersilochinae) from Vietnam, Zoosystematica Rossica (China) 28 (1), pp. 120-131 : 126-128

Probles (Euporizon) proshchalykini sp. nov.

( Figs 20–26)

Holotype. Female, Southern Vietnam, Dak Lak Prov ., Chư Yang Sin National Park , Krong K’Mar [Krông Kmar], 740–900 m, Malaise trap, 2–10. VI.2007, coll. C. v. Achterberg & R. de Vries ( RMNH).

Comparative diagnosis. Probles proshchalykini sp. nov. is immediately distinguished from other Oriental and East Palaearctic species of the genus by its head with genae short and strongly swollen behind the eyes ( Fig. 22). The new species also possesses an unusually small clypeus ( Fig. 23) and broad rectangular basal area of propodeum delimited laterally by strong basal longitudinal carinae ( Fig. 25).

Description. Female. Body length 4.2 mm, fore wing length 3.0 mm.

Head swollen and strongly rounded behind eyes in dorsal view ( Fig. 22); gena almost half as long as eye width. Clypeus ( Fig. 23) small, lenticular, 2.2 times as broad as high, 0.7 times as broad as face (shortest distance between inner eye margins), slightly convex, separated from face by broad impression, smooth and shining, finely punctate in upper 0.3. Mandible robust, somewhat twisted and rather strongly tapered towards apex (so that its width at level of teeth 0.4 times as great as basal mandibular width); upper tooth distinctly longer than lower one. Malar space 0.7 times as long as basal mandibular width. Antennal flagellum ( Fig. 21) filiform, with 20 flagellomeres; subbasal flagellomeres 1.3–1.4 times and subapical flagellomeres 1.1 times as long as broad; flagellomeres 4 to 6 with subapical finger-shaped structures on outer surface. Face, frons and vertex granulate, dull, with dense punctures which quite distinct on frons and mostly indistinct on face and vertex. Gena with very fine and sparse punctures on smooth and shining background. Occipital carina complete.

Mesoscutum granulate, dull, with dense punctures (mostly indistinct anteriorly). Notaulus weakly impressed, indistinct. Scutellum with lateral carinae present only at its extreme anteri- or. Mesopleuron with fine and moderately dense punctures on smooth and shining background, peripherally granulate and dull. Foveate groove of mesopleuron deep and broad, S-curved, extending from epicnemial carina to almost base of mid coxa, with coarse transverse wrinkles ( Fig. 24). Propodeum with clearly delimited rectangular basal area which is twice as long as broad and 0.65 times as long as apical area ( Fig. 25); basal longitudinal carinae strong, subparallel; transverse carina and apical longitudinal carinae strong, complete; dorsolateral area finely granulate, weakly shining, impunctate; apical area truncate anteriorly ( Fig. 25), flat, granulate, with weak transverse wrinkles adjacent to apical longitudinal carinae. Propodeal spiracle separated from pleural carina by 1.5 times diameter of spiracle ( Fig. 24).

Fore wing with second recurrent vein (2m-cu) weakly postfurcal. Metacarpus (R1) not reaching tip of the wing. First abscissa of radius (Rs+2r) straight, 1.2 times longer than width of pterostigma. Intercubitus (2rs-m) long, slightly thickened, almost 3.0 times longer than abscissa of cubitus between intercubitus and second recurrent vein (abscissa of M between 2rs-m and 2m-cu). Hind wing with nervellus (cu1&cu-a) vertical. Legs slender. Tarsal claws weakly curved, not pectinate.

First metasomal tergite moderately slender, 3.6 times as long as posteriorly broad, smooth and shining dorsally, predominantly smooth ventro-laterally, with several strong striae before glymma; first tergite in lateral view with upper margin straight in anterior 0.7 and arcuate in posterior 0.3; petiole trapeziform in cross-section, with sharp dorsolateral carina ( Fig. 24); postpetiole in dorsal view broader than petiole. Glymma deep, moderately large, situated slightly behind centre of first tergite and joining by deep furrow to ventral part of postpetiole ( Fig. 24). Second tergite 1.4 times as long as anteriorly broad. Thyridial depression small, oval, clearly delimited, about 1.5 times as long as broad. Ovipositor slender, weakly and evenly upcurved, with shallow dorsal subapical depression ( Fig. 26); sheath 2.3 times as long as first tergite.

Head, mesosoma and first metasomal segment black; lower 0.4 of clypeus and mouthparts yellow, but teeth of mandible reddish black; scape and pedicel of antenna as well as tegula yellow or brownish yellow. Antennal flagellum brown. Pterostigma dark brown. Legs brownish yellow, but fore and mid coxae darker at base, and hind coxa dark brown except for brownish yellow apex. Metasoma behind first segment predominantly brown to dark brown dorsally and laterally, yellow ventrally and at distal end; tergites 2 to 5 dorsally with posterior yellow band ( Fig. 20).

Male. Unknown. Etymology. The species is named in honour of the well-known Russian entomologist, expert in Apoidea ( Hymenoptera ), M.Yu. Proshchalykin (Vladivostok). Distribution. Southern Vietnam.