Platylabus nigricollis, (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 : 1450-1451

Сyclolabus nigricollis (WESMAEL) (Plate 28)

Platylabus nigricollis WESMAEL 1844 - Nouv. Mém. Acad. Sci. Bruxelles 28: 161.

Сyclolabus nigricollis: HEINRICH 1937 - Polskie Pismo Ent. 14 (15): 139, female, Ƌ.

F e m a l e

F l a g e l l u m: Bristle-shaped, with 30 segments, scarcely widened and flattened ventrally beyond middle, gradually attenuated toward apex, dorsally with white semiannulus on segments 5-10; all segments longer than wide, basal segment 3,5 times longer than width at apex. Flagellum 1,1 times longer than front wing and 1,2 times shorter than body length.

H e a d: Head contour from front roundish, transversal, 1,4 times wider than height, strongly narrowed downwards; genae from front equal 0,4 height of eye; head contour from above strongly transversal, 1,9 times wider than length. Vertex from lateral abrupt just after the ocelli to occipital carina; temples from above strongly roundly narrowed behind eyes, 1,5 times shorter than longitudinal diameter of eye at middle, from side parallel to hind margin of eye; occipital carina from above strongly roundly impressed to hind ocelli and reach the level of eyes and far not reach level of hind ocelli, not high, but sharp all round, meeting with hypostomal carina slightly not reaching mandible base; malar space equal to mandible base width; mandibles with form character to tribe, gradually narrowed; clypeus convex, transversal, 1,7 times wider than length, with straight front margin and rounded lateral corners, separated from face by deep impression; clypeal foveae deep, narrow, of moderate size; labrum protrude from under clypeus, short, rounded; middle field of face distinctly elevated (well-defined), 1,4 times narrower than lateral fields in middle; antennal cavities deep, not reach borders of eyes and far not reach front ocellus level, laterally above antennal fossae with tubercles and with distinct tooth between antennal fossae; margins of antennal fossae rather high elevated; ocelli of normal size, diameter of lateral ocellus equal to distance from ocellus to eye; ocellar triangle expressed. Surface of face and frons densely wrinkly-punctured, slightly shining without microsculpture, clypeus roughly punctured.

T h o r a x: Collar of pronotum short; transverse furrow shallow. Mesonotum strongly convex, of equal length and breadth; notauli sharp in front third; surface of mesonotum densely and roughly punctured (first of all middle lobe), slightly shining; subalarum high, thin, sharpened; speculum wrinkly-punctured; area of mesopleural fovea broadly impressed; sternauli reach to middle of mesopleurae, weak (only just marked); mesopleurae without sharp bend at lower part; mesopleurae very densely wrinkly-punctured, shining, without microsculpture; scutellum high, from above triangle, laterally carinated up to apex, horizontal part slightly conically convex, densely punctured by big punctures, shining. Hind margin of metanotum with long bacilliform projections opposite lateral longitudinal carinae. Propodeum strongly shortened and slanted, horizontal part almost three times (2,7) shorter than length of area posteromedia in middle; all fields of propodeum developed, area superomedia transversal, hexagonal, costula distinct, situated at middle of area superomedia; area dentipara with denticle at apex; spiracles of propodeum small, circular, 1,1-1,2 times longer than width (equal 0,3 breadth of field at place of spiracle). Surface of propodeum wrinkled, of metapleurae wrinkly-punctured, shining.

L e g s: Long and slender. Claws small, thick with sharply curved, almost at right angle apices.

W i n g s: Areolet from quadrangular, practically symmetrical, to pentagonal with very narrow base; stigma narrow, rather dark; radius straight, strongly curved at apex; nervulus interstitial; ramulus absent or only just expressed; membrane of wing hyaline, veins slightly darkened. Front wing 1,4 shorter than body length.

A b d o m e n: Abdomen of female from above longish-oval, second tergite at apex 1,3 times wider than length, apical tergites strongly hidden, ovipositor distinctly protrude. Petiolus of first tergite strongly flattened at base, from lateral with sharp passage to postpetiolus and strong carinae; dorsomedian and dorsolateral carinae merged in middle of petiolus; lateral carinae sharp; surface between lateral carinae wrinkled; from above petiolus gradually broadened to postpetiolus; middle field of postpetiolus sharply carinated, its surface from coriaceous to slightly irregularly-wrinkled; lateral fields wider than middle field. Gastrocoeli deep, transverse, perpendicular to longitudinal axis of a body, short, reach margins of tergite; thyridia distinct, closed to base of tergite, considerably wider than interval (1,4 times); lunulae big, distinct; tergites 2-3 densely punctured, second tergite at base in middle wrinkled, with developed microsculpture, other tergites very delicate superficially-punctured, almost smooth; tergites 6-7 with membranous apex; apical sternites with membranous hind margin. Hypopygium with longitudinal fold; sheath of ovipositor protrude behind apex of abdomen on length of third segment of hind tarsus.

C o l o r a t i o n: Head and thorax completely black, abdomen ferruginous with darkened apex and white stripes on (4)5-7 tergites and last sternites; legs, with exception of coxae and trochanters of basic color; apices of hind femora and tibiae and hind tarsi darkened.

S i z e: Body length: 7,2; front wing: 5,1; flagellum: 5,8 mm.