Syspasis puerulus ( KRIECHBAUMER , 1890)

Riedel, Matthias, 2021, Revision of the Palaearctic species of Syspasis TOWNES, 1965 (Hymenoptera, Ichneumonidae, Ichneumoninae), Linzer biologische Beiträge 53 (2), pp. 775-810 : 791-793

Syspasis puerulus ( KRIECHBAUMER, 1890) (figs 10, 21, 30, 43, 57)

Original: Ichneumon puerulus KRIECHBAUMER, 1890: 182 .

H o l o t y p e: (♀) [red] Holotypus; Teg. 9.4.58 ex Krchb; Numer. pulveraria L.p.; Stenichneumon puerulus (KRCHB.) (ZSM) , type studied, previously misidentified as Ichneumon eburnifrons (auct. non WESMAEL).

syn. nov. Coelichneumon derasus var. picta ROMAN, 1904 , synonymized with eburnifrons auct. by ROMAN (1937: 1-2).

M a t e r i a l e x a m i n e d: 3♀♀ 3♁♁ from Finland, Georgia *, Germany, Japan *, Russia (Karelia), Slovenia *.

D e s c r i p t i o n: ♀: Body length 10 mm. Flagellum with 32-34 flagellomeres, slightly lanceolate; 1 st flagellomere 2.7-3.0× and 2 nd flagellomere 2.8-3.0× longer than wide, combined length 0.6-0.67× eye length; 10 th to 15 th flagellomeres square, widest flagellomeres 1.0-1.2× wider than long. Temple moderately and roundly narrowed behind eye. OED 1.0× ocellar diameter. Frons almost smooth. Face densely punctate, granulate medially. Clypeus densely punctate. Gena with scattered punctures ventrally, 0.65× as wide as eye. MI 0.4. Mesosoma with dense pale hairs. Side of pronotum with very superficial punctures dorsally and with longitudinal rugae ventrally and caudally. Notaulus distinctly impressed frontally. Lateral field of mesoscutum with superficial punctures and distinct granulation, dull. Mesopleuron densely punctate, partly rugose. Metapleuron punctate, shining. Scutellum moderately elevated, slightly wider than long, punctate, without lateral carina. Area basalis wide, without distinct median tubercle. Area superomedia large, horseshoe-shaped, rugulose, but shining, open apically; anterior transverse carina ± distinct, caudal to its middle. Area externa with scattered punctures, almost smooth. Area petiolaris densely punctate, with lateral carina. Coxae punctate and granulate; hind coxa densely pilose but without distinct scopa. Hind femur densely punctate, with scattered punctures in ventral third, 3.6-3.7× longer than wide. Areolet pentagonal, frontal distance between veins 2rs-m and 3rs-m 2-3× their width. Vein 2m-cu slightly distal to its middle. Vein 1cu-a slightly postfurcal. Metasoma oxypygous. Lateral field of postpetiolus c. 0.5× as wide as median field, the latter with c. 10 longitudinal striae. Gastrocoelus narrow. Thyridium transverse, 2.2× wider than the interval between thyridia. 2 nd tergite 0.85× as long as wide. 2 nd and 3 rd tergites coarsely but superficially punctate, aciculate medially; 4 th tergite granulate, ± shining. Ovipositor sheath slightly extending behind metasomal apex (by 0.2× length of 7 th tergite).

Color: black. Stripes on flagellomeres 6-12 and narrow stripe on frontal orbit yellowish. Tergites and legs brown or black; fore tibia yellowish frontally. Pterostigma brownish,

paler proximally. ♁: Body length 10 mm. Flagellum with 30-33 flagellomeres; 1st flagellomere 2.2× and

2 nd flagellomere 1.6× longer than wide, combined length 0.6× eye length. Tyloids on flagellomeres 6/7-12/17, linear, maximally 0.5-0.7× as long as the flagellomeres. Temple moderately narrowed behind eye. Frons finely and transversely rugose-punctate, granulate. Clypeus flat, slightly impressed preapically. Gena granulate and superficially punctate, 1.0× as wide as eye. MI 0.2-0.3. Mesosoma with dense whitish hairs. Speculum smooth. Scutellum slightly wider than long, with scattered punctures, shining, with lateral carina in basal 0.1-0.3. Area basalis with small median tubercle. Area superomedia slightly longer than wide or wider than long, horseshoe-shaped, almost smooth. Area externa smooth and shining, with scattered punctures. Area petiolaris moderately impressed. Hind femur densely punctate, 3.3-3.6× longer than wide. Fore metatarsus without apical tooth. Vein 1cu-a interstitial or slightly postfurcal.

Lateral field of postpetiolus 0.7× as wide as median field, the latter with c. 15 fine longitudinal striae, finely granulate or almost smooth. Gastrocoelus indistinct. Thyridium transverse, c.2.2× wider than the interval between thyridia. 2 nd tergite 0.85× as long as wide. 2 nd to 4 th tergites with very superficial punctures, granulate. 2 nd tergite weakly striate medially.

Color: black. Mandibular base, palps, clypeus, entire face (sometimes with two paramedian black stripes), frontal orbit, outer orbit up to vertex, scape ventrally, collar and upper margin of pronotum, subtegular ridge and posterolateral triangular spot on scutellum yellowish. Coxae and trochanters black; fore and mid legs reddish-brown, ± yellowish frontally; hind femur black; hind tibia reddish-brown basally and infuscate in apical

0.3-0.5; tarsi ± infuscate. Pterostigma brown, slightly paler centrally.

Host: Plagodis pulveraria (LINNAEUS, 1758) (Lep., Geometridae ) (ZSM).

T a x o n o m i c a l r e m a r k: Ichneumon zagoriensis SCHMIEDEKNECHT was synonymized with Ichneumon eburnifrons auct. by ROMAN (1937) and others, but the description does not correlate with this species: inner orbits, spots on vertex, ring on flagellum and stripes of upper margin of pronotum ivory; pterostigma reddish. I. zagoriensis remains unrevised.

I saw a male from Japan (from Kanagawa Province: Kanagawa Museum) which showed no morphological differences to the description of ♁ above, but differs from West Palaearctic ♁♁ by the coloration of legs: fore and mid femora black ; fore and mid tibiae and tarsi black, with yellowish frontal stripes; hind leg entirely black. Its color pattern is otherwise similar. It is the first report of this species from the Eastern Palaearctic region .