Tricholabus strigatorius (GRAVENHORST)

A. M, 2011, Illustrated key to the genera of the subtribe Amblytelina of Palaearctic (Hymenoptera, Ichneumonidae, Ichneumoninae, Ichneumonini), Linzer biologische Beiträge 43 (1), pp. 597-711 : 631-633

Tricholabus strigatorius (GRAVENHORST) (Plate 2)

Ichneumon strigatorius GRAVENHORST 1829 - Ichneumonologia europaea 1: 352.

Tricholabus strigatorius: THOMSON 1894 - Opusc. Ent. 19: 2113.

Tricholabus strigatorius: PERKINS 1960 - Roy. Ent. Soc. London 7, 2 (aii): 207.

Tricholabus strigatorius: RASNITSYN 1981 - Opr. Faun. SSSR 3 (3): 623-624.

F e m a l e

F l a g e l l u m: Slender, bristle-shaped, with 45 segments, black with white semiannulus on segments (9)8-12(13), behind white annulus slightly broadened and fattened ventrally; first segment 2,5 times longer than the width at apex, last but one segment elongated. Flagellum 1,2 times longer than front wing and 1,5 times shorter than body length.

H e a d: Head contour from front strongly roundly narrowed downwards, transverse, 1,2 times wider than height; genae (malar space) 5 times shorter than height of an eye (0,2); head from above slightly transverse, 2,7 times wider than length in middle, but 1,7 times than along an external contour. Vertex from lateral straightly slanting down to occipital carina from hind ocelli; temples rather long, in middle approximately equal to longitudinal diameter of an eye, from above roundly narrowed behind eyes, from lateral parallel to hind margin of an eye; occipital carina sharp at all distance, from above deeply roundly impressed, but not reach level of eyes and hind ocelli, merged with hypostomal carina on mandible base; length of genae equal to mandible base width; mandibles rather short and broad, evenly narrowed to apex, with two teeth, lower tooth considerably shorter than upper one and slightly moved inside; clypeus transverse, 2,1 times wider than length, slightly convex at base with straight front and thickened and oblique lateral margins, practically not separated from face by impression; clypeal foveae sharp, deep, round; labrum roundly-triangular, narrower than front margin of clypeus; middle field of face only just elevated above lateral fields, equal by width to lateral fields in middle; antennal cavities not large, but deeply impressed, without lateral tubercles and with very small tubercle between antennal fossae, far not reach front ocellus level; front margins of antennal fossae sharply elevated above lateral fields of face; frons above antennal cavities slightly concave; ocelli of normal size, diameter of lateral ocellus only just lesser than distance from ocellus to eye; ocellar triangle expressed, distinctly elevated. Surface of head punctured by superficial punctures, upper part of face slightly transversely wrinkly-punctured, shining.

T h o r a x: Collar of pronotum short with rounded front margin, transverse furrow deep and broad; epomiae strong; pronotal ridge not thickened; pronotal base almost straight, lower corner of pronotum very acute. Mesonotum moderately convex, longer than width, laterally bordered by sharp impression; notauli impressed only at base; axillary tongue developed; surface of mesonotum with large punctures, shining, without microsculpture; prepectal carina sharp, high elevated; subalarum high, moderately thick, not sharpened; surface of speculum sculptured by large punctures as other part of mesopleurae, polished; mesopleural foveae small and deep, area of mesopleural fovea moderately narrowly impressed; lower part of mesopleurae not separated angularly; sternauli only just expressed at base; mesopleural suture straight, deeply impressed, interrupted by sharp ribs; upper part of mesopleurae under subalarum with big punctures, lower one with more dense punctuation to slightly longitudinally-wrinkled without microsculpture, shining; scutellum quite high elevated above postscutellum, convex, not carinated laterally, gradually slanted to postscutellum, horizontal part with sparse superficial punctures. Hind margin of metanotum with narrow triangular projections opposite lateral longitudinal carinae. Propodeum from lateral roundly convex (gradually curved backwards), its horizontal surface strongly convex, 1,2 times shorter than area posteromedia in middle; carinae of propodeum sharp with exception of slightly developed carina limiting area superomedia in front; costulae and coxal carinae absent; basal area long, without tubercle; area superomedia hexagonal, from middle narrowed and rounded in front, elongated, 1,4 times longer than width in middle; lateral longitudinal and pleural carinae parallel as in Lymantrichneumon HEINRICH and Protichneumonini ; spiracles not great, but long, approximately 2,5 times longer than width; surface of propodeum except basal area and area superomedia punctured by large punctures to wrinkled, shining, without microsculpture.

L e g s: Slender and long; claws of all the tarsi smooth, thin, gradually curved.

W i n g s: Areolet pentagonal with broad base, practically symmetrical; stigma narrow, light; radial cell narrow and long; radius slightly curved; ramulus distinct; nervulus postfurcal; nervellus of hind wing strongly reclival. All veins of both of wings developed; membrane of wing hyaline. Front wing 1,8 times shorter than body length and almost equal by length to flagellum.

A b d o m e n: Of female amblypygous, from above narrow, parallel-sided on considerable extent, with distinct constrictions between 2-5 tergites; second tergite only just longer than width at apex. First tergite from lateral almost straight with gradual transform to postpetiolus; dorsal and dorsolateral carinae only just visible, only ventrolateral carina expressed; lateral surface of petiolus smoothed, shining with slight wrinkling; petiolus narrow, from above gradually but sharply transform to postpetiolus; middle field of postpetiolus not expressed; surface of postpetiolus with indistinct sparse punctures, smooth, shining. Gastrocoeli large, very deep, almost not oblique; thyridia sharp, equal to interval between them; lunulae slight but distinct; second tergite densely punctured by quite large punctures. Sternites 2-4 strongly unsclerotized with sharp longitudinal fold; hypopygium from below long triangular with sharp apex and membranous hind margin.

C o l o r a t i o n: Body black with red tergites 1-3 of abdomen; white or yellow: upper frontal (not vertical) spots, interrupted stripe on collar of pronotum, apical bands on tergites 4-7 of abdomen. Legs black, apices of front and middle femora, tibiae and tarsi red, hind tarsi darkened.

S i z e: Body length: 10,8; front wing: 6,0; flagellum: 7,0 mm.

M a l e

Flagellum ribbed from first segments, with white semiannulus and without tyloides. By coloration similar to female with additional white stripe on external orbits and fully white seventh tergite of abdomen; base of first tergite darkened. Hypopygium apically with triangularly extended central part and characteristic knoll-shaped swelling at apex. Oedeagus at apex with sharp hook.