Mesochorus ( Stictopisthus ) fraxini ( SCHWENKE , 1999)

Mesochorus ( Stictopisthus) fraxini ( SCHWENKE, 1999) (fig. 23)

O r i g i n a l: Stictopisthus fraxini SCHWENKE, 1999: 32 .

H o l o t y p e: (³) “Harrlach/N-Bay, 17.7.72 Schwenke” (ZSM), type examined.

D e s c r i p t i o n: Ô. Body length 2.8 mm. Flagellum with 25 segments; 1 st flagellar segment 7.5× as long as wide and 0.65× as long as eye; 2 nd segment 5.0× as long as wide. Temple short, but only slightly narrowed behind eye, dorsally 0.6-0.7× as long as eye. OED 1.5× ocellar diameter. Face coarsely punctate, its width 1.0× combined length of face and clypeus and 0.9× eye length, sides slightly divergent ventrally. Subantennal transverse carina slightly dipped centrally. Dorsal mandibular tooth slightly larger than ventral tooth. MI 0.3-0.4.

Mesosoma not depressed, 1.7× as long as high. Mesopleuron with sparse punctures ventrally, speculum smooth and shining. Propodeum completely carinate, but area basalis and area superomedia confluent. Area superomedia c. 2× as long as wide; costula reaching at its middle. Area petiolaris slightly as long as wide. Hind femur 4.3× as long as wide. Areolet sessile frontally; vein 1cu-a slightly postfurcal by 0.2× its length; distal part of metacarpus as long as width of pterostigma. 1 st tergite 2.9× as long as wide; postpetiole coarsely aciculate. 2 nd tergite as long as wide. Thyridium transverse, comma-shaped. Stylet slightly clubbed at apex, 1.3× as long as 2 nd hind tarsomere.

Color: yellowish. Stemmaticum blackish. Basal flagellomeres yellowish; flagellum fuscous distally. Mesoscutum yellowish, with brown spot fronto-medially and pale brownish lateral stripes. Propodeum blackish; metapleuron yellowish. Legs yellow; hind tibia and hind tarsomeres narrowly brownish at apices. Pterostigma hyaline.

♀ unknown.

R e m a r k s: The only known Ô is closely related to M. ( St.) formosus . It differs by the stouter mesosoma, very slender flagellum, and slightly clubbed tip of paramere. The transverse carina below antennal sockets appears slightly dipped medially, but the morphology is otherwise typical for the subgenus Stictopisthus .

D i s t r i b u t i o n: Only known from Germany.