Dentilabus HEINRICH

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 : 1522-1523

30. Dentilabus HEINRICH

Dentilabus HEINRICH 1974 - Ann. Zool. Wars. 32 (8): 147-149.

Type species: Platylabus variegatus WESMAEL.

D i s t r i b u t i o n: Palaearctic and Oriental Regions (highland). 5 species from Burma.

I n t r o d u c t i o n:

The genus is similar to Platylabus WESMAEL in morphology of broad and deep gastrocoeli with very narrow interval between them and with very large thyridia. In contrast to Platylabus temples just behind eyes are sharply strongly narrowed backwards; propodeum is comparatively long; areae dentiparae are with very strong teeth; the second tergite of abdomen at base in middle is with distinct longitudinal impression. In the affined genus Lamprojoppa CAMERON second tergite is with similar gastrocoeli and thyridia and in middle also with a longitudinal impression; propodeum is with apophysises. However, scutellum of Lamprojoppa is sharply different, triangle from lateral, with conical elevation on horizontal surface.

M o r p h o l o g y:

F l a g e l l u m: Of females very slender, long, bristle-shaped, not widened and not flattened ventrally beyond middle. Flagellum appreciably longer than front wing. Flagellum of males without distinct tyloides.

H e a d: Head contour from front roundish; temples from above very strongly and more straightly than at Platylabus narrowed backwards; occipital carina meeting with hypostomal carina not reaching mandible base; mandibles narrow, with form character to tribe, strongly and gradually narrowed from base to apex; clypeus strongly convex with almost straight front margin; antennal cavities small, deeply impressed with strong tooth between antennal fossae.

T h o r a x: Transverse furrow of pronotum not interrupted by keel; pronotal ridge not thickened; epomiae weak; pronotal base from lateral almost straight. Mesonotum strongly convex, of equal length and breadth; notauli practically absent; surface of mesonotum very densely wrinkly-punctured with developed microsculpture; subalarum thin, not sharpened; sternauli in form of very slight impression up to middle of mesopleurae; scutellum convex, from above triangle, laterally carinated up to apex, its horizontal part uniformly convex. Hind margin of metanotum with triangular projections. Propodeum from lateral oblong; horizontal part of propodeum and area dentipara comparatively long; all carinae of propodeum, except of costulae (sometimes costula very slightly marked), distinct; areae dentiparae with very strong teeth, almost apophysises; spiracles of propodeum longish-oval, rather long.

L e g s: Long and slender.

W i n g s: Areolet quadrangular, slightly asymmetrical; nervulus interstitial. Front wing shorter than body length.

A b d o m e n Abdomen longish-oval, second tergite slightly transverse; sheath of ovipositor only just visible protrude. First tergite from lateral with gradual bend to postpetiolus; petiolus broad and flattened at base; dorsolateral and ventrolateral carinae sharp; middle field of postpetiolus slightly expressed, not carinated. Gastrocoeli very deep, short, laterally reach to borders of tergite; thyridia sharp, many wider than interval between them, slightly oblique; interval with strong longitudinal impression; lunulae very distinct, large; second and third tergites very densely punctured. Hypopygium from lateral pointed, compressed.

C o l o r a t i o n: Head and thorax more or less richly marked by white; tergites of abdomen mainly with white bands and white apical pattern on last tergite, rarely monochromatic.