Coelichneumon crassicornis Uchida, 1927

Riedel, Matthias & Watanabe, Kyohei, 2021, The genus Coelichneumon Thomson in Japan (Hymenoptera, Ichneumonidae, Ichneumoninae), Zootaxa 4948 (4), pp. 501-545 : 515-516

Coelichneumon crassicornis Uchida, 1927

Coelichneumon comitator var. crassicornis Uchida, 1927: 195 , ♀.

Lectotype: ♀ “Sapporo, Matsumura; [red] Type Matsumura; C. crassicornis n.sp. det. Matsumura; [green] Coelichneumon comitator var. crassicornis Uchida det. K. Kusig.´67” (Sapporo), type studied. Missing: both fore femora, tibiae and tarsi, and right fore wing.

Description: ♀: Body length 16 mm. Flagellum strongly lanceolate, with 42 flagellomeres; 1 st flagellomere 1.8× longer than wide, 2 nd flagellomere 1.8× longer than wide, combined length 0.50× eye length; c.9 th flagellomere square, widest flagellomeres 2.4× wider than long. Temple slightly narrowed behind eye; frons coarsely rugosepunctate. OED 1.6× and OOD 1.2× ocellar diameter. Face coarsely punctate and granulate. Clypeus punctate, shining and smooth between punctures. Gena wide, 1.25× wider than eye, with rather dense punctures ventrally. MI 0.6.

Sides of pronotum coarsely punctate dorsally, with striation in ventral 2/3. Mesoscutum with pale hairs; notaulus indistinctly impressed in frontal fifth, lateral fields of mesoscutum with dense but partly superficial punctures, granulate and ± opaque. Mesopleuron and metapleuron densely and coarsely rugose-punctate. Juxtacoxal carina weak. Scutellum slightly elevated, slightly wider than long, with rather dense punctures, without lateral carina. Area superomedia with indistinct carinae, finely rugulose, anterior transversal carina lacking. Area externa superficially punctate. Area petiolaris rugose. Mid and hind coxae densely punctate, hind coxa with strong whitish scopa (about 1/4 of coxal length). Hind femur stout, 3.3× longer than wide, densely but superficially punctate. Hind tibia without external spurs. 3 rd mid tarsomere wide, c.1.15× longer than wide. Areolet pentagonal, frontal distance between veins 2rs-m and 3rs-m 2× their width; vein 2m-cu distad its middle. Vein 1cu-a postfurcal by 1× its width.

Lateral field of postpetiolus c.0.65× as wide as median field, median field with c.12 rather coarse longitudinal striae. Gastrocoelus strongly impressed, with longitudinal ridges. Thyridium large, transverse, c.1.5× wider than the interval, interval 0.7× as wide as median field of postpetiolus. 2 nd tergite 1.15× wider than long. 2 nd to 3 rd tergites coarsely punctate, 2 nd tergite aciculate medially, 3 rd tergite in its basal half only. 7 th tergite 1.4× wider than long. Seen from dorsal, ovipositor sheath c.0.2× as long as 7 th tergite.

Color: Black. Basal flagellomeres and face with reddish-brown suffusion. Flagellomeres 7‒14 with ivory stripes. Narrow stripe on frontal orbit reddish-yellow. Vertex without distinct pale spot. Scutellum reddish, with apical yellowish band. Mid and hind legs including coxae and trochanters reddish-brown, tibiae yellowish-brown frontally. Wings hyaline, pterostigma yellow.

♂ unknown.

Distribution: Japan (Hokkaido).