Hypomecus quadriannulatus (GRAVENHORST)

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 : 1504-1505

Hypomecus quadriannulatus (GRAVENHORST) (Plate 47)

Mesoleptus quadriannulatus GRAVENHORST 1829 - Ichneum. Europ. 2: 13, Ƌ.

Hypomecus quadriannulatus: HEINRICH 1962 - Canad. Ent. 27: 795-796, ♀, Ƌ.

Hypomecus quadriannulatus: HEINRICH 1974 - Ann. Zool. Wars. 32 (8): 93-94, ♀, Ƌ. F e m a l e

F l a g e l l u m: Bristle-shaped, long and slender with 38 segments and with white annulus on segments (8)9-12(13), slightly widened beyond middle and flattened ventrally, strongly attenuated toward apex; basal segments slender, long; first segment 5 times longer than width at apex laterally. Flagellum 1,2 times longer than front wing and 1,2 times shorter than body length.

H e a d: Head contour from front narrowed downwards, 1,2 times wider than height; genae moderately (uniformly) narrowed downwards, long, 5 times shorter than height of eye, head contour from above transversal, 2 times wider than length. Vertex from lateral behind eyes sharply rather gradually slanting down to occipital carina; occipital carina angularly impressed to hind ocelli, not high; temples from above behind eyes sharply and strongly, but roundly narrowed, from lateral narrowed downwards, moderately long, 2,1 times shorter than longitudinal diameter of an eye in middle; occipital carina meeting with hypostomal carina not reaching mandible base, lower part of hypostomal carina visible from lateral; malar space equal to mandible base width; mandibles sharply narrowed behind base, with form character to Platylabini ; clypeus convex, transversal, 1,9 times wider than length, with straight front margin, separated from middle field of face by strong impression; clypeal foveae deep, of moderate size; labrum long, far protrude from under clypeus, broad, triangle; middle field of face moderately convex, narrowed downwards, wider than lateral fields at middle; antennal cavities large, deep, without lateral tubercles and tooth between antennal fossae, not reach front ocellus level; ocelli large, diameter of lateral ocellus slightly more than distance from ocellus to eye; ocellar triangle distinctly, but slightly elevated. Face and clypeus shining without microsculpture; clypeus from sparsely punctured at lower half to densely and delicate uniformlypunctured; middle field of face slightly wrinkled; antennal cavities with smooth surface; frons and vertex polished, shining, without traces of punctures.

T h o r a x: Collar of pronotum short, from above with straight front margin; transverse furrow moderately deep. Mesonotum strongly convex, only just visible longer than width; notauli distinct in front third; surface of mesonotum very densely punctured, with developed microsculpture, with only just visible shine; subalarum thin, sharpened; speculum very densely punctured, interspaces narrower than punctures, shining; area of mesopleural fovea deeply and broadly impressed; mesopleurae without sharp bend; sternauli weak, marked in front third; upper half of mesopleurae densely punctured, without microsculpture, lower part densely wrinkly-punctured, matt; scutellum convex, square from above, with long slanting part, laterally carinated by weak carinae; vertical surface of scutellum and postscutellum with dense microsculpture, shagreen, horizontal part densely wrinkly-punctured, without microsculpture. Hind margin of metanotum with narrow triangle projections opposite lateral longitudinal carinae. Propodeum from lateral strongly and gradually slanting backwards; horizontal part two times shorter than length of area posteromedia in middle; area superomedia usually longer than width, from front rounded; costulae atrophied and visible only in form of slight trace; front part of lateral longitudinal carina (above spiracles) atrophied; coxal carina absent, coxal area marked in form of more slightly sculpturated surface; area dentipara at apex with denticle; spiracles rather large, equal 0,5 breadth of field at place of spiracle, elongated, 1,7-2 times longer than width. Surface of area superomedia with slight wrinkles, lateral areas and area dentipara wrinkled, metapleurae densely and roughly punctured.

L e g s: Slender and long. Claws sharply curved at upper third.

W i n g s: Areolet big, from quadrangular to almost pentagonal with very narrow base, symmetrical; stigma comparatively narrow, dark; radius slightly sinuous; radial cell long and rather broad; ramulus distinct; nervulus interstitial; membrane of wing hyaline, veins dark. Length of front wing 1,3 times shorter than body length, but shorter than flagellum.

A b d o m e n: Abdomen from above long, narrowed to apex, fusiform, second tergite 1,3 times longer than width at apex; sheath of ovipositor only just visible protrude behind apex of abdomen. First tergite from lateral gradually curved; petiolus at base not flattened, laterally not sculpturated (smooth from lateral), ventrally not bordered by carinae; from above petiolus broadened to rectangular postpetiolus; middle field of postpetiolus distinctly expressed, but not carinated by carinae, its surface irregularly-wrinkled, lateral fields narrow, many narrower than middle field. Gastrocoeli superficial, long with very large oblique thyridia, reaching to borders of tergite, far removed from base of second tergite, two or more times wider than interval between them; interval irregularlywrinkled, with similar sculpture to gastrocoeli; interval and second tergite medially with slight, but distinct broad impression; lunulae large, distinct; surface of tergites 3-4 delicate wrinkled, with dense microsculpture, matt, microsculpture of apical tergites more weak, tergites 5-7 slightly shining. Hypopygium of female compressed from sides, long, strongly sharpened, protrude behind apex of last tergite.

C o l o r a t i o n: Main color black with reddish-brown, head and thorax with slight white pattern, spots on vertex, internal orbits, spots on genae and yellowish stripes on external orbits, spot on subalarum and lateral spots on scutellum. Legs reddish-brown, hind tarsi with white annulus.

S i z e: Body length: 10,1; front wing: 7,5; flagellum: 8,7 mm.

M a l e

Flagellum of male some stouter with very large light broadly-oval tyloides equal by length to length of flagellar segments. Area superomedia of propodeum square. Face and clypeus of males completely white, upper margin of pronotum, pronotal base, prepectus and mesothorax ventrally, merged spots on scutellum; coxae and trochanters of front and middle legs with reach white pattern.