Bystra rufa (Cameron, 1903)

Riedel, Matthias, 2019, Contribution to the Ichneumoninae (Hymenoptera, Ichneumonidae) of Nepal, Linzer biologische Beiträge 51 (2), pp. 1119-1162 : 1126-1127

Bystra rufa (CAMERON, 1903)

M a t e r i a l: Nepal, Prov. Karnali, Churta E Hochtal , 3500-3800 m, 1♀ 02.VI.2007, leg. F. Creutzburg ( Erfurt ) .

D e s c r i p t i o n: ♀: Body length 14 mm. Flagellum lanceolate, with 47 flagellomeres; 1 st flagellomere 1.5x longer than wide, 7 th flagellomere square, widest flagellomeres c. 2.1x wider than long, preapical flagellomere about square. Temple strongly and roundly narrowed behind eye, dorsally c. 0.45x as long as eye. Distance of lateral ocellus to eye 1.1x ocellar diameter. Vertex and frons granulate and with superficial dense punctures, matte. Face with coarse and rather dense punctures, shining. Clypeus slightly convex, 2.1x wider than long, with scattered punctures; apical margin blunt and straight. Labrum slightly exposed. Gena granulate and with superficial dense punctures, 1.0x as wide as eye. Malar space 0.9x as long as width of mandibular base. Mandible rather slender, with two teeth, lower tooth smaller and slightly bent inwards (by c. 40°). Genal carina reaching hypostomal carina close to mandibular base, hypostomal carina weak.

Mesosoma with fine grey hairs. Pronotum with superficial punctures, shining. Notaulus not distinctly impressed. Mesoscutum granulate and with very fine dense punctures, matte. Mesopleuron and metapleuron densely punctate; juxtacoxal carina present. Scutellum slightly convex, about as long as wide, with lateral carina in 7/10 of scutellar length, with rather dense punctures. Area basalis partly carinate laterally, with small median tubercle. Area superomedia hexagonal, about as long as wide, rugose; costula distinct, reaching area superomedia in its middle. Area externa coarsely punctate. Area petiolaris rugose-punctate, with weak lateral carina. Apical transversal carina reaching area petiolaris close to its frontal margin, with narrow lamella at outer dentiparal edge, without apophysis. Hind coxa densely punctate, without scopa. Hind femur 4.2x longer than wide, with dense punctures. Claws not pectinate, strongly bent apically.

Areolet quadrangular, pointed frontally; 2 nd recurrent vein reaching areolet in the middle. Nervulus interstitial.

Metasoma oxypygous. Postpetiolus moderately widened apically, without dorsal carina, field not separated, smooth and with scattered and partly denser punctures. Gastrocoelus distinctly and smoothly impressed, about as long as wide. Thyridium oblique, 0.35x as wide as the interval. 2 nd tergite about as long as wide, with very fine and dense punctures, matte. Following tergites finely granulate, shining. 2 nd to 4 th sternites with median folds. Ovipositor sheath stab-shaped, narrow, distinctly extending behind metasomal apex (by 0.5x length of 7 th tergite).

Colour: Mainly red. Flagellomeres 1-5 red, flagellomeres 6-17 slightly paler reddish, following flagellomeres black. Mesosoma red; hind edge of pronotum, subtegular ridge, scutellum and postscutellum yellowish-red; central stripe on pronotum, mesopleuron below subtegular ridge and at posteroventral edge, metapleuron ventrally, scutoscutellar groove and areas beside scutellum and postscutellum black. 1 st and 2 nd tergites red; following tergites black, 3 rd tergite with rectangular basomedian red spot. Legs entirely red. Wings hyaline, pterostigma brown.

♂ unknown.

R e m a r k: I was not able to study the type material of Bystra rufa CAMERON but the original description fits well with this Nepalese specimen except that the areolet is described as pentagonal by CAMERON. Here I give a detailed description of the Nepalese specimen.

D i s t r i b u t i o n: Known from India, new record for Nepal.