Levansa decoratoria (FABRICIUS)

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 : 1469-1471

Levansa decoratoria (FABRICIUS) (Plate 35)

Ichneumon decoratorius FABRICIUS 1775 - Systema entomologiae: 333, ♀.

Levansa decoratoria: TOWNES 1961 - Cat. Reclass. Indo-Austr. Ichn.: 394, 474. F e m a l e

F l a g e l l u m: Slender, 34-segments, gradually attenuated to apex, beyond middle practically not widened, without white annulus, ventrally practically not flattened, all segments elongated, basal segments long, first 4 times longer than width at apex laterally. Flagellum 1,3 times shorter than front wing and 1,1 times shorter than body length.

H e a d: Head contour from front narrowed downwards, 1,4 times wider than height, triangle; genae from front almost straightly narrowed downwards, equal 0,4 height of eye; head contour from above strongly transversal, 2 times wider than length. Vertex from lateral straightly and obliquely sloping to occipital carina; temples from above moderately long, sharply almost straightly narrowed behind eyes, temples length at middle 1,7 times shorter than longitudinal diameter of eye, temples from lateral practically parallel to hind margin of eye; occipital carina from above strongly roundly impressed, not reach level of eyes and far not reach level of hind ocelli, not high, sharp all round, meeting with hypostomal carina far from mandible base; length of abscissula equal to mandible base width; hypostomal carina visible from lateral on long distance, up to level of third of eye; malar space equal to mandible base width; mandibles gradually and strongly narrowed behind base; clypeus with form character to tribe, with straight front margin, transversal, 2 times wider than length, distinctly separated from face by impression; clypeal foveae of middle size, circular, deep; labrum roundly rectangular, slightly protrude from under clypeus; middle field of face high elevated above lateral fields, narrow, in middle 1,2 times narrower than lateral fields; antennal cavities small, short, moderately impressed, reach borders of eyes and far not reach front ocellus level, reach only to middle of frons and forming uniform uninterrupted impression, laterally above antennal fossae with tubercles and with only just visible interantennal tubercle; margins of antennal fossae high elevated; ocelli large, strongly convex, diameter of lateral ocellus equal to distance from ocellus to eye; ocellar triangle distinctly elevated. Clypeus and middle field of face with sparse punctures, middle field with slightly and lateral fields with strongly developed microsculpture, front surface of head with only just visible shine, surface of antennal cavities and frons mainly shagreen; surface of head with microsculpture and only just visible shine, practically matt.

T h o r a x: Collar of pronotum short with smoothed front margin; transverse furrow of pronotum narrow and deep. Mesonotum strongly convex, 1,1 times longer than breadth, notauli broad, developed up to middle of mesonotum; middle lobe and lateral lobes with superficial punctures, shining with only just visible microsculpture; subalarum narrow, sharpened; speculum smooth, shining; area of mesopleural fovea broadly, but slightly impressed, mesopleural fovea only just expressed; sternauli in form of slight impressions, distinct up to middle; mesopleurae with gradual, but expressed bend between lateral and ventral parts; mesopleural suture straight, deep, practically without transversal ribs and bend toward mesopleural fovea; surface of mesopleurae smoothly-punctured, shining, without microsculpture; scutellum strongly convex, from above triangle, from lateral gradually slanting to postscutellum, in contrast to other Platylabini scutellum laterally carinated just only at base (not carinated); horizontal part of scutellum strongly convex with singular punctures, shining. Hind margin of metanotum practically without projections, only with only just visible bulges. Propodeum from lateral strongly slanting backwards, without sharp break, horizontal part only 1,2 shorter than length of area posteromedia in middle; carinae of horizontal part of propodeum, with exception of slightly expressed apical parts of lateral longitudinal carina of area dentipara, reduced; apical transverse carina and carinae of vertical part of propodeum developed, carina metapleuralis distinct, coxal carina absent; basal area short and deep; apices of area dentiparae without teeth; spiracles of propodeum of moderate size, roundish, only just longer than width, length of spiracles 1,3 times longer than width. Surface of propodeum slightly shining, shagreen; only area spiraculifera slightly transversally-wrinkled; metapleurae smooth, shining, not sculptured.

L e g s: Legs slender; claws rather long, not thickened at base, at apex rather strongly curved.

W i n g s: Areolet quadrangular with blunted base, strongly asymmetrical (external vein of base considerably longer than internal, and external vein of apex sharply shorter than internal); stigma broad, light; radius short, straight at most part, sharply curved only at apex; radial cell short and broad; nervulus slightly postfurcal; ramulus absent; nervellus of hind wing broken at top; membrane of wing hyaline, veins light. Front wing 1,1 shorter than body length.

A b d o m e n: Form of abdomen from above drop-shaped; second tergite long, 1,4 times longer than width at apex; sheath of ovipositor not protrude behind apex and not visible from above. Petiolus wider than height at base, from lateral sharply, but gradually transform to postpetiolus; only lateral carinae weakly but distinctly developed; interspace between dorsolateral and ventrolateral carinae with slight irregular rugosity; from above petiolus uniformly broadened to postpetiolus; middle field not expressed, only at apex elevated above lateral fields; surface of postpetiolus shagreen, shining. Gastrocoeli presented by shallow, slightly oblique impression; thyridia practically not expressed, interval between gastrocoeli at base equal by breadth to middle field of postpetiolus; lunulae not expressed; all tergites of abdomen shagreen (densely superficially punctured by only just visible punctures), shining; tergite seven hidden under sixth. Hypopygium long, reach to apex of abdomen and completely overlap sheath of ovipositor, from below triangle, flat, slightly compressed from sides only at apex.

C o l o r a t i o n: Most part of body mainly ferruginous; only tergites 3-4 darkened; flagellum and hind tarsi darkened.

S i z e: Length of body: 7,5; front wing: 6,8; flagellum: 5,0 mm.