Ichneumon longigenalis, Riedel, 2019

Riedel, Matthias, 2019, Contribution to the Ichneumoninae (Hymenoptera, Ichneumonidae) of Nepal, Linzer biologische Beiträge 51 (2), pp. 1119-1162 : 1136-1137

Ichneumon longigenalis nov.sp. ( fig. 29 )

Holotype: ♀ " Nepal, Umg. Gotichaur, 13.6.1997, 29°12´10´´N 82°18´56´´E, leg. Creutzburg, 2850 m, Weissschale" ( SDEI).

D e s c r i p t i o n: ♀: Body length 12 mm. Flagellum bristle-shaped, with 39 flagellomeres; 1 st flagellomere 2.8x longer than wide, c. 14 th flagellomere square; widest flagellomeres about square, preapical flagellomere 1.2x longer than wide. Head covered with short brownish hairs. Temple moderately and almost linearly narrowed behind eye, dorsally 0.8x as long as eye. Distance of lateral ocellus to eye 1.6x ocellar diameter. Frons and face coarsely rugose-punctate. Clypeus densely punctate, almost flat, apical margin sharp and almost straight. Gena 1.3x wider than eye, densely striate-punctate. Malar space 1.6x longer than width of mandibular base and about as long as 1 st flagellomere. Mandible narrow; upper tooth about 3x longer than lower one. Genal carina reaching hypostomal carina far away from mandibular base; both carinae low.

Mesosoma covered with brownish hairs. Side of pronotum and mesoscutum densely rugose-punctate, matte. Notaulus not impressed. Mesopleuron and metapleuron coarsely rugose-punctate; juxtacoxal carina absent. Scutellum moderately elevated, 1.4x wider than long, densely punctate, with lateral carina in basal 0.4. Propodeum coarsely rugose. Area superomedia square; costula absent. Area petiolaris rugose, with lateral carina. Hind coxa densely punctate, without scopa. Hind femur with scattered punctures in ventral 1/5, 4.5x longer than wide. Claws not pectinate.

Areolet pentagonal, frontal distance of intercubiti c. 4x their width; 2 nd recurrent vein slightly distal to its middle. Nervulus postfurcal (by 2x its width).

Metasoma oxypygous, but hypopygium slightly elongate (c. 0.5x as long as distance of its apical margin to metasomal apex). Postpetiolus strongly widened apically, without dorsal carina. Lateral field c. 0.5x as wide as median one; median field with coarse regular longitudinal striation. Gastrocoelus distinctly impressed and with strong ridges. Thyridium slightly oblique, 1.0x as wide as the interval. 2 nd tergite 1.3x wider than long. 2 nd and 3 rd tergites densely rugose-punctate, ± matte; 2 nd tergite with longitudinal rugae medially. Following tergites with fine granulation and shining. Apical tergites slightly compressed, metasomal apex with distinctly narrowed sides. Only 2 nd and 3 rd sternites with median fold. Ovipositor sheath slightly extending behind metasomal apex.

Colour: Black. Antenna tricoloured: Scape, pedicle and flagellomeres 1-8 red; flagellomeres 9-13 yellowish; following flagellomeres black. Mesosoma black; hind edge of pronotum, tegula and spot on subtegular ridge red; scutellum ivory. Metasoma black; 2 nd and 3 rd tergites red, 7 th tergite with weak median reddish spot. Coxae and trochanters black; legs otherwise (including all trochantelli) red; hind femur narrowly infuscate apically; hind tibia in apical 0.1 and hind tarsus blackish. Wings distinctly yellow infuscate; pterostigma yellow.

♂ unknown.

R e m a r k: This new species resembles I. creutzburgi nov.sp. and can be differentiated by the absence of the juxtacoxal carina, longer malar space, reddish base of antenna, completely red 2 nd and 3 rd tergites and weak reddish spot on 7 th tergite.

Figures

Figs 26-29: Habitus from dorsal: (26) Ichneumon cavigena nov.sp. ♀, (27) Ichneumon cavigena nov.sp. ♂, (28) Ichneumon creutzburgi nov.sp. ♀, (29) Ichneumon longigenalis nov.sp. ♀.