Microchelonus foersteri Tobias, sp. n. (figure, I-5)

Material. Holotype Y, locality and date of collec-tion not indicated (?Central Europe); two labels: "Chelonus tenuicornis m., 16 gl. [antenna] segments]." "Coll. Foerster." Deposited at MNHU. Paratype: l a, Lithuania, "Sapiegini, 27.V.1970, A. Jakimavičius."

Description. Female. Head roundly narrowing be-hind eyes; its width 1.7 times its length, 1.3 times its height, and 1.3 times mesonotum width. Temples slightly longer than transverse eye diameter (8 : 7). Length of base of ocellar triangle equal to distance from posterior ocellus to eye plus ocellus diameter. Distance between posterior ocelli twice ocellus di-ameter. Longitudinal eye diameter 1.5 times transverse one, twice gena height, 0.77 times face width. Face height 0.55 times its width, 1.5 times clypeus height. 1st flagellar segment 3 times, 9th twice, as long as wide [apical segments lost; judging from the name given to the species by Foerster, they must be narrow and long]. mesosoma length 1.55 times its height. Propod-eum without transverse carina, with small blunt lateral processes and median depression running along nearly its entire length. Anterior margin of radial cell 0.66 times as long as pterostigma. Radial cell 1.5 times as large as radiomedial one. 3rd radial abscissa 3 times as long as 2nd, 1.7 times as long as 1st radiomedial vein. 1st radial abscissa very short; therefore, 2nd radiome-dial cell almost sessile. Nervulus length slightly ex-ceeding distance from nervulus to basal vein. Hind femur 3.3 times as long as wide. Hind tarsus as long as hind tibia. Inner spur of hind tibia 1/3 as long as 1st segment of hind tarsus. 5th segment of hind tarsus as long as 2nd, considerably longer than 3rd. Abdominal carapace widening to apical third, bent downward apically along 0.15 of its length, 2.1 times as long as wide, 3.5 times as long as high. Ovipositor slender, its protruding part as long as two basal segment of hind tarsus combined.

Vertex and temples finely transversely striate, faintly shining. Face with fine concentric rugae. Cly-peus weakly punctate, shining. mesosoma finely rugose-punctate, dull. metasoma with not coarse longitudinal rugae extending as far as its posterior third. Body black. Legs brown, fore femur and tibia yellowish brown. Wings faintly infuscate, with light brown veins.

Body length 2.7 mm.

Male. In contrast to that in female, propodeum bearing low but distinct transverse Carina and median depression only above it. Antennae 20-segmented. 1 st radial abscissa short but distinct, about 0.33 times as long as 2nd. Anterior margin of radial cell 0.58 times as long as pterostigma, 3rd radial abscissa 0.37 times as long as 2nd. metasoma 2.4 times as long as wide, less widened apically than in female. Apical abdomi-nal opening occupying about half width of carapace, oval, 2.3 times as wide as high; dorsal surface of pos-terior margin of carapace markedly protruding above opening; median process of opening occupying 1/3 of its height, its length twice its height.

Body length 2.85 mm.

Differential diagnosis. M. foersteri sp. n. differs from most of Microchelonus species in the extremely shortened 1 st radial abscissa and the nearly sessile 2nd radiomedial cell. In addition, its clear distinction is the strongly elongated and apically widened metasoma

Notes. In M. foersteri, the distinctive feature of fore-wing venation in male is less clearly pronounced than that in female (1st radial abscissa is present, even being short); male also differs from female in the structure of propodeum. Other characters of structure (in the first place, strongly elongate body and short 1st radial abscissa), sculpture, and coloration leave scarcely any doubt that the male and female belong to the same species.