Linycus CAMERON, 1903

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 : 1454-1455

7. Linycus CAMERON

Linycus CAMERON 1903 - Entomologist 36: 234.

Type species: Linycus rufipes CAMERON.

Linycus: PERKINS 1959 - Royal Ent. Soc. London 7: 67.

Linycus: HEINRICH 1962 - Syn. Nearct. Ichn. Sten.: 777-783.

Linycus: TOWNES et al. 1965 - Cat. Reclass. East. Pal. Ichn.: 513, 600.

Linycus: TOWNES H. & M. TOWNES 1966 - Cat. Reclass. Neotr. Ichn.: 273.

Linycus: HEINRICH 1974 - Ann. Zool. Wars. 32 (8): 178-179.

Linycus: HEINRICH 1977 - Ichn. Florida and Neigb. States 9: 278-279.

D i s t r i b u t i o n: Holarctic, Oriental and Neotropical Regions.

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

Linycus belongs to a group of genera with small circular or roundish spiracles of propodeum. From such genera as Neolynicus HEINRICH Cyclolabus HEINRICH Carlsonia HEINRICH Cyclolabellus HEINRICH and also from Apaeleticus WESMAEL and Ectopoides HEINRICH it is differed by peculiar structure of gastrocoeli, which is presented only by narrow and shallow rudimentary longitudinal impression with some rough, irregular longitudinal ribs. From New Zealand Levansa Townes it is differed by carinated scutellum and developed carination of propodeum. From Afrectopius (= Hoplectopius) HEINRICH and Ectopius WESMAEL it differs by absence of strongly developed teeth or apophysises on propodeum.

M o r p h o l o g y:

F l a g e l l u m: Of females slender, bristle-shaped, practically not widened beyond middle, with white semiannulus, beyond white annulus very slightly flattened ventrally, all segments longer than wide. Flagellum equal by length to front wing. Flagellum of males with white annulus or semiannulus and with distinct longish-oval, very narrow, almost bacilliform tyloides.

H e a d: Head contour from front narrowed downwards, genae almost straightly narrowed downwards, temples from above short, very strongly roundly narrowed behind eyes. Occipital carina meeting with hypostomal carina not far from mandible base; mandibles gradually and strongly narrowed behind base, with form character to Platylabini ; clypeus convex with form character to tribe with straight front margin, strongly transversal, distinctly separated from face; antennal cavities small, slightly impressed, with strong tooth between antennal fossae; ocellar triangle slightly elevated. Clypeus with exception of front margin with dense rough punctuation, middle field wrinkly-punctured in different degree.

T h o r a x: Transverse furrow of pronotum not interrupted by keel; pronotal ridge not thickened in extreme form and pronotum impressed laterally practically up to border with mesonotum; epomiae weak; pronotal base sharply curved almost angularly. Mesonotum strongly convex, of equal length and breadth, notauli sharp, turn behind middle of mesonotum; subalarum narrow; sternauli slightly impressed, distinct in front third; scu- tellum strongly convex, triangle from above, from lateral gradually slanting to postscutellum, laterally sharply carinated up to apex by high carinae. Hind margin of metanotum with triangular projections. Propodeum from lateral strongly slanting backwards, without sharp break, horizontal part more than two times shorter than vertical; all carinae of propodeum, with exception of coxal, expressed; area superomedia transversal, pentagonal or rounded in front, costulae developed; area dentipara at apex with small denticle; spiracles of propodeum small, circular. Surface of propodeum irregularly-wrinkled.

L e g s: Moderately long and slender.

W i n g s: Areolet distinctly pentagonal with narrow base, slightly asymmetrical; radius straight, curved only at apex; nervulus interstitial. Front wing some shorter than body length.

A b d o m e n Form of abdomen from above rhomboidal; second tergite transversal; Petiolus wider than height at base, from lateral gradually curved to postpetiolus; lateral carinae sharp, dorsomedian and dorsolateral carinae, in contrast to representatives of other genera, merge not far from base of tergite; middle field of postpetiolus slightly elevated, but distinct. Gastrocoeli presented by shallow, slightly sloped impressions; thyridia practically not expressed; lunulae big, distinct; 6th and 7th tergites hidden and only just protrude from under 5th; apical tergites with membranous hind margin. Hypopygium from lateral with acute apex, compressed from sides and membranous apically.

C o l o r a t i o n: Rusty-red with black; head black without white pattern.

S i z e: 7-8 mm.