Casinaria ischnogaster

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 : 734-735

Casinaria ischnogaster THOMSON, 1887 ( figs 3 , 36 )

Casinaria ischnogaster THOMSON, 1887: 1101 ♀♂

Lectotypus: (♀) Löp, ♀, ischnogaster (Lund) , studied by HORSTMANN.

R e m a r k: This taxon is closely related to Casinaria mesozosta (GRAVENHORST) and is characterized by the externo-medial ivory coloration of the hind tibiae only. The colour of hind tibiae is rather variable in C. mesozosta (GRAVENHORST). Therefore, both species are not always separable. It is not impossible that C. ischnogaster THOMSON represents a colour-form of C. mesozosta (GRAVENHORST) only.

D e s c r i p t i o n: ♀: Body length 7-8 mm. Flagella with 34-38 segments; 1 st flagellomeres length 3.1x width; preapical flagellomeres square or slightly longer than wide. Temples narrow, strongly narrowed behind eyes. Distance of lateral ocelli to eyes 0.9x and between them 1.3-1.4x their diameter. Face strongly narrowed ventrally, finely rugose-punctate, minimal width 0.54x eye length and 0.9x width of frons. Malar space length 0.2-0.3x width of mandibular bases. Genal carinae strongly bent outwards ventral- ly, reaching hypostomal carinae near mandibular bases in an angle of 90°. Hypostomal carinae slightly elevated.

Mesopleural discs granulate, with superficial punctures; specula granulate, matte, sometimes partly almost smooth and more or less shining; dorsal impressions strongly striate. Prepectal carina narrow, absent on the transversal parts. Metapleura finely rugose; coxal carinae absent. Propodeum without distinct carinae, finely rugose; area petiolaris with moderately deep narrow medial impression, covered with some transverse ridges. Hind femora length 4.8-5.0x width; length of inner spurs of hind tibiae 0.7x hind metatarsus length. Areolets usually stalked (rarely sessile), 2 nd recurrent veins in or distal to the middle; nervuli distinctly postfurcal; postnervuli intercepted in or before middle; external angles of discoidal cells acute (70-80°); nervelli of hind wing reclivous, usually not intercepted. 2 nd tergite length 1.7-2.0x width, thyridia long oval to roundish, distance from basal margins c.1.5x their length; 3 rd tergite length 1.0-1.05x width.

Colour: Black. Palps, mandibles except teeth and tegulae yellowish. Scapes and pedicels often ± reddish, flagella black. Metasoma completely black or 2 nd tergite apically, 3 rd tergite ± and 4 th tergite laterally and/or apically reddish. All coxae black, sometimes fore and middle coxae reddish; fore and middle trochanters and all trochantelli yellowish, hind trochanters black; legs otherwise red; fore and middle tibiae yellowish on outer surface; hind tibiae red, ivory to yellow basally and externo-medially, sometimes reddish externo-medially, with brownish subbasal rings and infuscate in apical 0.25-0.3. Hind tarsi except ivory bases of metatarsi brownish to blackish. Pterostigmata brown.

♂: Flagella with 29 segments, preapical flagellomeres slightly wider than long. Discs of mesopleura finely rugose-punctate. 2 nd tergite length 1.7x width, 3 rd tergite 1.0x. Metasoma completely blackish. Fore and middle coxae ± red; fore and middle trochanters and all trochantelli yellowish; hind femora brownish apically; fore and middle tibiae and tarsi ivory externally. Otherwise as described for the ♀.

Hosts: Alsophila aescularia (DENIS & SCHIFFERMÜLLER, 1775) (Lep. Geometridae ) (ZSM), Abrostola tripartita (HUFNAGEL, 1766) (Lep., Noctuidae ) (ZSM), Callistege mi (CLERCK, 1759) (Lep. Noctuidae ) (EDI), Cucullia verbasci (LINNAEUS, 1758) (Lep. Noctuidae ) (EDI), Hypena proboscidalis (LINNAEUS, 1758) (Lep., Noctuidae ),

D i s t r i b u t i o n: Austria*, Croatia*, Czechia (Bohemia), France, Norway, Poland, Russia Far East, United Kingdom.

Figures

Figs 1-8: Metasomas of ♀♀ of: (1) Casinaria affinis TSCHEK; (2) C. cultellator AUBERT; (3) C. ischnogaster THOMSON; (4) C. morionella HOLMGREN; (5) C. petiolaris (GRAVENHORST); (6) C. scabra THOMSON; (7) C. subglabra THOMSON; (8) C. compressiventris nov.sp. HT.

Figs 35-37: Heads from lateral of: (35) Casinaria albipalpis (GRAVENHORST); (36) C. ischnogaster THOMSON; (37) C. moesta (GRAVENHORST).