Eurylabus torvus WESMAEL

A. M, 2009, Illustrated key to the tribes of subfamilia Ichneumoninae and genera of the tribe Platylabini of world fauna (Hymenoptera, Ichneumonidae), Linzer biologische Beiträge 41 (2), pp. 1317-1608 : 1338-1340

Eurylabus torvus WESMAEL (Plate 3)

Eurylabus torvus WESMAEL 1844 - Nouv. Mem. Acad. Sc. Bruxelles 18 (1944): 141, ♀, Ƌ. F e m a l e

F l a g e l l u m: Of female slender, bristle-shaped, with 38 segments, with white annulus on segments 8-11(12), beyond white annulus slightly flattened ventrally and practically not widened beyond middle; basal segments long, first segment 3,8 times longer than width at apex, all segments longer than wide. Flagellum almost equal by length to front wing and 1,4 times shorter than body length.

H e a d: Head contour from front slightly transversal, 1,3 times wider than height, roundly narrowed downwards, with strongly projecting genae; genae from front long, 2,8 times shorter than height of an eye; from above head contour transversal, 1,8 times wider than length. Vertex from lateral gradually slanting down to occipital carina; temples profile behind eyes from above convex, roundish, from side long, 1,7 times longer than longitudinal diameter of an eye at the middle, from middle parallel to hind margin of eye; occipital carina sharp, moderately high, from above gradually impressed to hind ocelli, far not reach level of eyes and hind ocelli, at the bottom before mandible base atrophied and not meeting with hypostomal carina; malar space equal to mandible base width; mandibles large, narrowed to middle, from middle parallel sided with large teeth, which situated in the same plane, upper tooth only slightly longer than lower; clypeus transverse, sharply separated from face, of peculiar form (angular in profile), with sharpened front margin, at the apex with rounded projection with two tubercles and with sharpen lateral corners; clypeal foveae large, deep; labrum rounded, very short with long pubescence on front margin; middle field of face narrow, narrower than lateral fields, strongly elevated, well-defined; antennal cavities deeply impressed, reach level of front ocellus and almost borders of eyes, margins of antennal cavities high elevated above margins of eyes, antennal cavities without lateral tubercles and with weak tubercle between antennal fossae; margins of antennal fossae slightly elevated above face; ocelli moderately convex, of normal size, diameter of lateral ocellus two times less than distance from ocellus to eye; ocellar triangle slightly elevated. Front surface of head, with the exception of apex of clypeus with dense coarse punctures; temples finely punctured; head surface smooth, shining, without microsculpture.

T h o r a x: Collar of pronotum moderately long; transverse furrow deep; pronotal ridge not thickened; pronotal base uniformly curved. Mesonotum moderately convex, of equal length and breadth; notauli only just marked at base; axillary tongue distinctly expressed, but small; surface of mesonotum with delicate superficial punctures, shining, without microsculpture; subalarum thin, high, but not sharpened; speculum smooth, shining; area of mesopleural fovea deeply and broadly impressed; mesopleural suture very deep; lower part of mesopleurae angularly separated; sternauli shallow, reach hind third of mesopleurae; upper half of mesopleurae with delicate dense punctures, shining, without microsculpture, lower half wrinkly-punctured, shining; scutellum moderately convex gradually slanting to postscutellum, laterally not carinated, its surface with delicate superficial punctures, shining without microsculpture. Hind margin of metanotum with broad triangle projections opposite lateral longitudinal carinae. Propodeum from lateral short, slanting backwards, with only just visible break; horizontal part 1,5 times longer than area posteromedia in middle; carinae of propodeum developed, with exception of only just indicated lateral carinae of basal area (basal area merged with first lateral area) and indicated as slight rugosity coxal carina; area basalis deep; area superomedia slightly transversal, rounded in front and narrowed backwards, costulae before middle; area dentipara at apex with tooth; spiracles large, long and wide. Horizontal part of propodeum irregularly longitudinally-wrinkled, shining, without microsculpture; metapleurae densely punctured without microsculpture.

L e g s: Quite slender, but strong; segments of tarsi of all legs distinctly thickened to apex; hind coxae without scopa; claws long, large, gradually curved, smooth.

W i n g s: Areolet big, quadrangular (or pentagonal with very narrow base), asymmetrical, external vein of apex longer than internal; stigma moderately dark and broad; radius long, sinuous; radial cell long; nervulus interstitial; ramulus expressed; all veins of hind wing developed; membrane of wing hyaline, slightly yellowish, veins dark. Front wing 1,3 times shorter than body length.

A b d o m e n: Of females amblypygous, from above broadened from base to middle and from its to apex, fusiform; second tergite transversal, shorter than breadth at apex; apex of abdomen compressed from sides. Petiolus dorsally flat, wider than height, dorsolateral and ventrolateral carinae of petiolus sharp, dorsomedian carina slightly expressed only on postpetiolus; lateral surface of petiolus with sharp ribs, wrinkled; petiolus from lateral with angular transition to postpetiolus, from above gradually, but distinctly broadened to postpetiolus; middle field only just marked; spiracles elongated, distance between them only just more than distance from spiracles to apex; surface of middle field with sparse smoothed superficial punctures and only just visible rugosity, practically smooth, shining. Gastrocoeli slightly impressed, slightly oblique and short, narrower than interval; interval with slight impression; thyridia absent; lunulae large, distinct; surface of second tergite very densely punctured to wrinkled in front third, shining, without microsculpture; third tergite with more delicate punctures, other tergites smooth, shining, polished; second and third sternites strongly membranous. Ovipositor very thin, curved downwards; hypopygium strongly compressed from sides, but without longitudinal fold and with cut apex.

C o l o r a t i o n: Body of female black, without traces of white pattern; legs with exception of coxae and trochanters rusty-red, apices of hind tibiae and tarsi darkened.

S i z e: Body length: 12,0; front wing: 9,0, flagellum: 8,7 mm.

M a l e

Males with similar coloration, only with white stripes on facial orbits. Flagellum of male, more long with narrow light tyloides on segments (8)9-18(19), without white annulus; flagellum pale yellow ventrally. Sculpture, especially of propodeum more sharp, area superomedia of propodeum very sharply elevated.