Ichneumon sikkimensis, Riedel, 2023

Riedel, Matthias, 2023, Five new Oriental species of the genus Ichneumon LINNAEUS (Hymenoptera, Ichneumonidae, Ichneumoninae), Linzer biologische Beiträge 55 (1), pp. 47-60 : 54

Ichneumon sikkimensis nov.sp. ( Figs 12-16 )

M a t e r i a l e x a m i n e d: Holotype: (♀) [ India] Sikkim, Yoksam , 4.xi.1978, leg. E. Albertshofer ( ZSM).

E t y m o l o g y: The species name refers to the collection site, the Indian province Sikkim.

D e s c r i p t i o n: Body length 9 mm. Flagellum filiform, with 35 flagellomeres; 1 st flagellomere 1.5 × longer than wide; 8 th flagellomere square; preapical flagellomere 0.6 × as long as wide. Temple slightly narrowed behind eye, dorsally about as wide as eye. OED 1.6 × and OOD 1.0 × ocellar diameter. Frons and vertex coarsely rugose-punctate, dull. Face punctate, sparsely punctate centrally, with some transverse rugae paramedially. Clypeus with sparse punctures, shining. Gena with very sparse punctures ventrally. Mandible unmodified and with two teeth; ventral tooth smaller than dorsal tooth. Malar space very long, 1.7 × longer than width of mandibular base.

Mesosoma covered with pale hairs. Notaulus not distinctly impressed. Mesoscutum with dense confluent punctures, dull. Mesopleuron punctate, striate in caudal half. Metapleuron completely striate. Juxtacoxal carina absent. Scutellum flat, as long as wide, without lateral carina and with very sparse punctures. Propodeum coarsely rugulose-punctate. Area superomedia rectangular, 1.1 × longer than wide; anterior transverse carina (costula) absent. Hind coxa without scopa, with very sparse punctures in apical half. Hind femur basally and in ventral half with sparse and superficial punctures, finely granulate, 3.7 × longer than wide. Tarsi rather slender, 3 rd mid tarsomere 1.7 × longer than wide. Claws simple. Areolet pentagonal, frontal distance between veins 2rs-m and 3rs-m 3 × their width. Vein 1cu-a strongly postfurcal.

Postpetiolus moderately widened apically, without distinct dorsal carina; median field with superficial fine aciculation. Gastrocoelus almost triangular, slightly impressed and with some fine oblique striae. Thyridium small, oblique, 0.3 × as wide as the interval between thyridia. 2 nd and 3 rd tergites with fine dense punctures; 2 nd tergite ± striate between thyridia; following tergites almost smooth and shining.

Color: reddish. Blackish are distal flagellum from 19 th flagellomere on, frons above antennae, propleuron, side of pronotum medially, frontal spot of mesoscutum, entire mesosternum, frontal margin of propodeum, area superomedia and area petiolaris, basal band of 2 nd tergite, basal and apical bands of 3 rd tergite, bases of coxae and spots of all trochanters. Yellowish are upper pronotal margin, prescutellar carina, scutellum and postscutellum, side of propodeum, hind margin of postpetiolus, posterolateral spots on 2 nd to 4 th tergites, apico-median spots of tergites 5-7 and subbasal rings of all tibiae. Wings hyaline, pterostigma yellowish.

♁ unknown.

R e m a r k s: This new taxon is closely related to I. americanicolor HEINRICH, 1965 and I. tricoloratus RIEDEL, 2019, but differs by its smaller size and subbasal yellow tibial rings.

D i s t r i b u t i o n: Northern India.

Figures

Figs 12-16: Ichneumon sikkimensis nov.sp. HT: (12) habitus, (13) face, (14) head from dorsal, (15) propodeum, (16) basal tergites.