Probles (Euporizon) diaparsiformis, 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 : 124-126

Probles (Euporizon) diaparsiformis sp. nov.

( Figs 11–19)

Holotype. Female, Northeast Vietnam, Hòa Bình

Prov ., Pa Co, Hang Kia Nature Reserve, 20°44'37''N,

104°56'20''E, 1045 m, Malaise trap 6, 9–23.X.2009, coll. C. v. Achterberg & R. de Vries ( RMNH) .

Comparative diagnosis. The new species resembles the genus Diaparsis as it has a strongly transverse head ( Fig. 13), large clypeus ( Fig. 14), foveate groove of mesopleuron strongly oblique and with coarse transverse wrinkles ( Fig. 15), and propodeum with a strong basal keel ( Fig. 16); but first metasomal tergite with glymma joining by distinct furrow with the ventral part of the

A.I. Khalaim. Four new species of Probles from Vietnam postpetiole ( Fig. 17), and second tergite with long thyridial depression ( Fig. 18) indicate that this is a species of the genus Probles . Probles diaparsiformis sp. nov. is easily distinguished from other Oriental and East Palaearctic species of the subgenus Euporizon by its strongly oblique and coarse foveate groove on the mesopleuron ( Fig. 15), very short ovipositor with two dorsal subapical teeth ( Fig. 19), and densely punctate head and mesosoma ( Figs 13, 14).

Description. Female. Body length 4.7 mm, fore wing length 3.3 mm.

Head strongly and roundly constricted behind eyes in dorsal view ( Fig. 13); gena almost half as long as eye width. Clypeus ( Fig. 14) large, lenticular, 2.6 times as broad as high, almost flat in lateral view, with lower margin slightly truncate; clypeus separated from face by weak impression, smooth, finely punctate in upper 0.8. Mandible slender, with upper tooth exceptionally long, more than 3.0 times longer than the lower. Malar space 0.65 times as long as basal mandibular width. Antennal flagellum ( Fig. 12) weakly tapered towards apex, with 19 flagellomeres; all flagellomeres (except for basal and apical ones) 1.6–1.8 times as long as broad; flagellomeres 4 to 6 with subapical finger-shaped structures on outer surface. Face and frons very densely punctate on granulate and dull background. Vertex granulate, dull, without distinct punctures. Gena very shallowly granulate, weakly shining, with very fine inconspicuous punctures. Occipital carina complete.

Mesoscutum and scutellum very densely punctate on granulate and dull background. Notaulus as wrinkle on anterolateral side of mesoscutum. Scutellum with lateral carinae present in anterior half. Foveate groove of mesopleuron very broad, strongly upcurved anteriorly, extending across mesopleuron, with coarse transverse wrinkles ( Fig. 15). Mesopleuron densely punctate (except impunctate area just above foveate groove), smooth between punctures centrally and granulate peripherally. Propodeum entirely granulate, impunctate, dull; transverse carina with short adjacent wrinkles. Propodeum with short basal keel which is 0.3 times as long as apical area ( Fig. 16); apical area rounded anteriorly ( Fig. 16), flat; apical longitudinal carinae subparallel in posteri- or 0.8, reaching transverse carina anteriorly ( Fig. 16). Propodeal spiracle separated from pleural carina by half diameter of spiracle.

Fore wing with second recurrent vein (2m-cu) distinctly postfurcal. Metacarpus (R1) reaching tip of wing. First abscissa of radius (Rs+2r) straight, 1.3 times longer than width of pterostigma. Intercubitus (2rs-m) long, weakly thickened, about as long as 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) weakly reclivous. Legs slen- der. Tarsal claws weakly curved, not pectinate.

First metasomal tergite slender, 4.5 times as long as posteriorly broad, entirely smooth, with upper margin very weakly convex in basal 0.8 and strongly arcuate in posterior 0.2 ( Fig. 17); petiole round in cross-section; postpetiole in dorsal view broader than petiole ( Fig. 18). Glymma deep, situated in posterior 0.4 of first tergite, joining by deep furrow to ventral part of postpetiole ( Fig. 18). Second tergite 1.7 times as long as anteriorly broad. Thyridial depression clearly delimited, 3.0 times as long as broad, posteriorly rounded ( Fig. 18). Ovipositor short, slightly upcurved, with two dorsal subapical teeth (proximal tooth strong, distal tooth weak) ( Fig. 19); sheath 0.7 times as long as first tergite.

Head and mesosoma black; lower 0.3 of clypeus and tegula yellow-brown; mandible (teeth dark red) and mouthparts yellow. Antenna with scape and pedicel brownish yellow, flagellum brown. Pterostigma dark brown, with pale marks at proximal and distal corners. Legs brownish yellow, but hind tibia and tarsus slightly darkened (brown). First metasomal segment black with slight brownish tinge. Metasoma behind first segment predominantly dark brown, ventrally and posteriorly yellow; posterior margins of tergites 2 to 5 yellow ( Fig. 11).

Male. Unknown.

Etymology. The species is named after the genus Diaparsis with the Latin suffix “-formis” (having the form of Diaparsis ).

Distribution. Northeast Vietnam.