Casinaria stygia, Tschek, 1871

Riedel, Olmgren Matthias, 2018, Revision of the Western Palae arctic species of the genus Casinaria H (Hymenoptera, Ichneumonidae, Campopleginae), Linzer biologische Beiträge 50 (1), pp. 723-763 : 748

Casinaria stygia TSCHEK, 1871 ( figs 23 , 34 )

Casinaria stygia TSCHEK, 1871: 54 ♀

Lectotypus: (♀) Type, 5.9.69, Piesting TSCHEK (Wien), studied by HORSTMANN.

D e s c r i p t i o n: ♀: Body length 5-6 mm. Flagella with 24-29 segments; 1 st flagellomeres length 2.7-3.1x width; preapical flagellomeres slightly wider than long or square. Temples moderately wide and narrowed behind eyes; head 2.1-2.2x wider than long. Distance of lateral ocelli to eyes 0.9-1.0x and between them 1.5-1.7x their diameter. Face moderately narrowed ventrally, finely rugose-punctate, minimal width 0.6x eye length and 0.8x frons width. Malar space length 0.3-0.4x width of mandibular bases. Genal carinae not bent outwards and obsolete ventrally, reaching hypostomal carinae far from mandibular bases in an acute angle of 70°. Hypostomal carinae slightly elevated.

Mesopleural discs granulate, with superficial punctures, sometimes ± shining; specula granulate, matte; dorsal impressions with moderately dense fine striae. Prepectal carina not elevated and absent on the transversal parts. Metapleura finely rugose or granulate; coxal carinae partly developed. Propodeum with complete carinae; area superomedia wider than long (c.1.4x), costulae partly distinct; area petiolaris not impressed, with irregular transversal rugae. Hind femora length 4.0-4.4x width; length of inner spurs of hind tibiae 0.63x hind metatarsus length. Areolets stalked, 2 nd recurrent veins in the middle; nervuli strongly postfurcal; postnervuli intercepted in or behind the middle; external angles of discoidal cells acute (70°); nervelli of hind wing intercepted in apical 0.7. 2 nd tergite length 1.0-1.25x width; distance of thyrida to basal margins 0.5-1x their length; 3 rd tergite length 0.65-0.85x width.

Colour: Black. Palps and mandibles reddish-yellow. Tegulae yellow or ± blackish. Scapes and pedicels sometimes reddish internally. All coxae and trochanters black, except reddish-yellow hind trochantelli; sometimes fore and middle trochantelli ± yellowish; fore and middle legs otherwise reddish or blackish; fore and middle femora apically and fore and middle tibiae externally yellowish; hind femora blackish, sometimes with reddish-brown suffusion; hind tibiae reddish or brown, infuscate subbasally and in apical 0.1-0.2, sometimes completely brown; hind tarsi except pale basal spot of metatarsi blackish. Pterostigmata brown.

♂: Flagella with 25-28 segments, preapical flagellomeres slightly longer than wide. Mesopleura finely granulate and ± shining, dorsal impression usually granulate, without distinct striae. 2 nd tergite length 1.2x width, 3 rd tergite length 0.75-0.8x width. Trochanters ± reddish.

H o s t s: Blastodacna hellerella (DUPONCHEL, 1838) (Lep. Elachistidae ) (EDI), Holoterpna pruinosata (STAUDINGER, 1897) (Lep. Geometridae ) (ZSM), Pseudoterpna pruinata (HUFNAGEL, 1766) (Lep. Geometridae ) (EDI).

D i s t r i b u t i o n: Austria, Germany, United Kingdom*.

Figures

Figs 21-24: Propodea of ♀♀ of: (21) Casinaria nigrotrochanterata nov.sp. HT; (22) C. paramorionella nov.sp. PT; (23) C. stygia TSCHEK; (24) C. subglabra THOMSON.

Figs 29-34: Tips of flagella of ♀♀: (29) Casinaria affinis TSCHEK; (30) C. flagellator nov.sp. HT; (31) C. morionella HOLMGREN; (32) C. pallipes BRISCHKE; (33) C. paramorionella nov.sp. HT; (34) C. stygia TSCHEK.