Ichneumon extensorius LINNAEUS

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 : 1376-1378

Ichneumon extensorius LINNAEUS (Plate 15)

Ichneumon extensorius LINNAEUS 1758 - Systema Naturae …, edition 10 (1): 561, ♀. Ichneumon extensorius extensorius HILPERT 1992 - Entomofauna, Suppl. 6: 179-182, ♀, Ƌ. F e m a l e

F l a g e l l u m: Filiform, with 34 segments, stout, first segment short, only 1,3 times longer than width at apex, already segment 4 square from lateral, last but one segment slightly transverse, with white dorsal semi-annulus on segments 7-13, flattened beyond white annulus. Flagellum 1,7 times shorter than the front wing and 2,2 times shorter than body length.

H e a d: Head contour from front slightly narrowed downwards, transversal, 1,2 times wider than height; genae from front 3,7 times shorter than height of eye; head contour from above stout, transversal, 1,6 times wider than length, slightly roundly narrowed behind eyes. Vertex from lateral straightly (slightly-roundly) slanting down after the ocelli to occipital carina; temples long, equal to longitudinal diameter of an eye at the middle, from side slightly broadened toward mandible base, from above slightly roundly narrowed behind eyes; occipital carina sharp all round, from above slightly roundly impressed, not reach level of eyes and hind ocelli; hypostomal carina not visible from lateral, occipital carina meeting with hypostomal carina far before of mandibles base; length of abscissula equal 0,6 of mandible base width; malar space 1,4 times shorter than the mandible base width; mandibles long, gradually narrowed behind base, upper tooth distinctly longer than lower; clypeus transversal, slightly convex, three times wider than length, with straight, thinned front margin and oblique lateral sides, separated from face by slight impression; clypeal fovea small, deep, round; labrum not protrude from under clypeus; middle field of face slightly elevated, in middle equal to lateral fields; antennal cavities deeply impressed, reach borders of eyes and far not reach front ocellus level, laterally above antennal fossae without tubercles and with sharp tubercle between antennal fossae; margins of antennal fossae slightly elevated above face surface; ocelli small, flat, diameter of lateral ocellus 1,5 times less than distance from ocellus to eye; ocellar triangle not expressed. Surface of clypeus and lateral fields of face with big, sparse, superficial punctures, without microsculpture; middle field wrinkly-punctured without microsculpture, frons punctured by big superficial punctures, temples densely punctured by superficial punctures, without microsculpture.

T h o r a x: Collar of pronotum long with rounded front margin (from above); transverse furrow of pronotum shallow, not interrupted by keel; pronotal ridge not swollen; epomiae sharp; pronotal base gradually curved with acute apex; mesonotum only just convex, of equal length and breadth; notauli in form of very slight impressions at base; axillary tongue not developed; middle lobe of mesonotum superficially wrinkly-punctured, without microsculpture, lateral lobes with superficial punctures; subalarum high, thin; speculum with sparse superficial punctures, shining; area of mesopleural fovea in a form of sharp longitudinal impression; mesopleural suture straight, deep, interrupted by very delicate, short ribs; mesopleurae at bottom without sharp bend; sternauli in a form of indistinct impressions in front third; lower part of mesopleurae longitudinally wrinkly-punctured, shining, without microsculpture, upper third slightly longitudinally-wrinkled; scutellum flat, laterally not carinated. Hind margin of metanotum with sharp triangle projections opposite of lateral longitudinal carinae. Length of horizontal part of propodeum 1,5 times longer than area posteromedia in middle; carinae of propodeum sharp, with exception of costulae; basal area long and not deep; area superomedia big, rectangular, only just visible elongated, slightly narrowed backwards, or parallel sided; areae dentiparae at apices without apophysises and teeth; spiracles long, along external contour 2,5 times longer than width. Surface of propodeum, with exception of punctured by big punctures metapleurae, wrinkled, shining, without microsculpture.

L e g s: Strong. Hind coxae with small light scopa. Hind tibiae with slight, sparse spinules. Claws normal, uniformly, but strongly curved.

W i n g s: Areolet pentagonal, asymmetrical, front veins longer than hind, internal vein of apex considerably longer than external; stigma normal, dark, radial cell broad, radius very slightly sinuous, almost straight; nervulus postfurcal; ramulus only just marked; all veins dark; membrane of wing hyaline; all veins of hind wings distinct. Length of front wing considerably longer than length of flagellum and some shorter than body length.

A b d o m e n:Oxypygous, from above longish-oval, apical tergites not hidden; second tergite transversal, at apex 1,5 times wider than length; sheath of ovipositor only just visible protrude. First tergite from lateral with sharp bend between petiolus and postpetiolus; petiolus not flattened at base, from lateral sharply carinated, sculpturated between carinae by smoothed punctures and ribs; from above petiolus sharply broadened to triangle postpetiolus; distance between spiracles many more than distance from spiracles to hind margin of tergite; middle field of postpetiolus sharply expressed and high elevated, only just wider than lateral fields, its surface regularly longitudinally-wrinkled (striated) without microsculpture. Gastrocoeli distinct, moderately deep, oblique; thyridia developed, but not sharp, approached to base of second tergite, interval between them equal to breadth of middle field of postpetiolus; lunulae small, weak, roundish, situated beyond middle of lateral surface of tergite; medial surface of second tergite slightly wrinkly-punctured up to apex, other part densely superficially punctured, without microsculpture, shining; tergite 3 densely superficially wrinkly-punctured, apical tergites shagreen. Hypopygium flattened, without longitudinal fold.

C o l o r a t i o n: Body black; second and third tergites red, frontal orbits narrowly yellow-red, vertex with slightly limited yellow-red spots, collar red; scutellum and moderately narrow spots on tergites 6-7 white; tibiae and tarsi of all legs red.

S i z e: Body length: 11,0; flagellum: 4,9; front wing: 8,4 mm.

M a l e

Flagellum bristle-shaped, with 38 segments and narrow bacilliform tyloides on segments 6-13, without white annulus, ribbed from segment 4; gastrocoeli in contrast to females sharply and deeply impressed; facial orbits broadly, frontal narrowly whitely-yellow, scutellum white, tergites 2-3 of abdomen red, other black, without traces of white pattern.