Rhinotorus leucostomus ( Gravenhorst, 1829 )

Reshchikov, Alexey V., 2016, A revision of the genus Rhinotorus Förster, 1869 (Hymenoptera, Ichneumonidae, Ctenopelmatinae), with descriptions of three new species and an illustrated identification key, European Journal of Taxonomy 235 (235), pp. 1-40 : 16-19

Rhinotorus leucostomus ( Gravenhorst, 1829)

Fig. 7

Tryphon leucostomus Gravenhorst, 1829: 17 .

Mesoleius impressus Brischke, 1871: 85 .

Spudaeus subimpressus Thomson, 1894: 2011 , lectotype examined.

Diagnosis

This species is distinguished from other species in the genus by the following characters: face entirely black ( Fig. 7D ); clypeus relatively wide and not projecting centrally ( Fig. 7D ); scutellum yellow ( Fig. 7B ); first metasomal tergite either projecting at spiracles or narrow basally ( Fig. 7A ); metasoma partly reddish ( Fig. 7E ).

Type material examined

Spudaeus subimpressus Thomson, 1894: 2011 . Lectotype ♀, SWEDEN, Skåne, MZLU.

Other material examined

AUSTRIA: 1 ♀, Hainbach, NHRS-HEVA000002061, leg. R. Hicker, NHRS; 1 Ƌ, Eisenstadt-Umgebung, Burgenland, Purbach am Neusiedlersee, 24 Aug. 1966, ex. Cladius pectinicornis (Geoffroy, 1785) , C. I. E. coll., BMNH.

DENMARK: 2 ♀♀, 1 Ƌ, Nordsjaelland, leg. Schiødte, ZMUC.

FRANCE: 1 Ƌ, N. W., ex. Tenthred. leg. H.D. Smith, NHRS-HEVA000002063, NHRS.

GERMANY: 1 Ƌ, Ruthe coll., BMNH.

RUSSIA: 1 Ƌ, Kamchatka, 3758, leg. R. Malaise, NHRS.

ITALY, 2 ♀♀, Veneto, Treviso, Meolo, 45°36′24.76″ N 12°27′25.19″ E, Malaise trap, 10–22 Jun. 2013, leg. F. Di Giovanni, NHRS; 1 ♀, Friuli-Venezia Giulia, Udine, Marano Lagunare, 45°46’36.36” N 13°09’32.06” E, Malaise trap, 21 Jul.–3 Aug. 2013, leg. F. Di Giovanni, NHRS.

SWEDEN: 1 ♀, Uppland, Håbo kommun, Biskops-Arnö, northern beach, elm grove, N 59°40.328´ E 17°30.051´(= Trap ID 8), 20 May–20 Jun. 2005 (= coll. event ID 1601), leg. SMTP, NHRS; 2 ƋƋ, Öland, Mörbylånga kommun, Frösslunda alvar, north eastern part, alvar pasture, N 56°32.847´ E 16°34.635´(= Trap ID 20), 20 Jul.–12 Aug. 2003 (= coll. event ID 234), NHRS-SMTP70700020-21, leg. SMTP, NHRS; 3 ƋƋ, Öland, Mörbylånga kommun, Frösslunda alvar, north eastern part, alvar pasture, N 56°32.847´ E 16°34.635´(= Trap ID 20), 25 Jun.–20 Jul. 2003 (= coll. event ID 233), NHRS- SMTP 70700013-15, leg. SMTP, NHRS.

U. K.: 1 ♀, Devon, Dartmoor, Lustleigh, 20 Jun. 1934, leg. Perkins, BMNH.

Description

Female

Fore wing around 5–6 mm long. Antenna slender, about as long as fore wing with 28–30 flagellomeres. Ratio of length of 1 st plus 2 nd flagellomeres to eye height 0.8. Scape short, almost as long as broad. Head rather narrowed behind eyes, matt, shagreened, and impunctate. Lateral ocellus separated from eye margin by 1.4 times their widest diameter. Face transverse 1.7 times as wide as high, shagreened, and impunctate ( Fig. 7D ). Clypeus 0.5 times as high as wide, distinctly separated from face by a shallow impression, strongly projecting medially, shining and sparsely punctate. Its apical margin thin and laterally impressed. Clypeal fovea not defined. Malar space 0.5 times basal mandible width. Occipital carina complete. Mandible teeth of equal length.

Mesoscutum weakly shining, finely granulate, and without punctures. Notaulus distinct. Mesopleuron rugose, not striated, matt, and impunctate. Metapleuron matt, rugose, and impunctate. Propodeum weakly rugose dorsally and granulated laterally ( Fig. 7C ). Area superomedia fused with area basalis, forming an X-shaped area that is around 1.6 times as long as broad. Costula absent. Area apicalis trapezoidal, 0.4 times as long as broad, as long as 0.35 of propodeum and with defined longitudinal carina. Spiracles roundish. Hind femur 5.3 times as long as broad. Hind tibia 7.9 times as long as apically broad. First tarsomere of hind leg 9.6 times as long as broad and 2.2 times as long as second tarsomere. Claws not pectinate. Fore wing with pterostigma around 3.6 times as long as broad and intercepted by Rs almost in its middle. 2m-cu straight, with a single bulla. Cu-a vertical, postfurcal. Hind wing with 1/Cu & cu-a intercepted by 2/Cu in lower 0.5.

Metasoma impunctate and reticulate rugose. First metasomal tergite as long as apically broad, projecting dorsally ( Fig. 7A ), its dorsal longitudinal carinae reaching middle of tergite and with strong impression between carinae in basal part. Area between dorsal carina and spiracle with longitudinal impression. Spiracles projecting laterally. Subapical impression strong and uniformly broad. First metasomal sternite 0.2 times as long as its tergite. Second metasomal tergite 0.5 times as long as apically broad, its transverse impression starting immediately after middle of tergite. Transverse impression of third tergite not defined. Ovipositor sheaths weakly almond-shaped and 0.5 times as long as height of last visible tergite. Ovipositor stout at base with shallow subapical notch, tip of upper valve after notch 0.3 times as long as ovipositor length.

Colouration: body mostly black ( Fig. 7 ); clypeus, mandibles, tegulae, scutellum and postscutellum yellow; antennal flagellomeres, pterostigma, legs (except coxa and apical part of hind tibia and tarsus), apical margin of first metasomal tergite and metasomal tergites 2–4 reddish.

Male

Morphologically similar to female. Parameres broad basally and weakly elongate apically, extending beyond aedeagus, volsella moderately large and apically notched, aedeagus apically downcurved.

Colouration as in female, but with face, clypeus, malar space, mandibles (except teeth), upper part of scape, flagellum ventrally, fore and middle coxae and trochanters, hind angle of pronotum and tegulae yellow.

Host records

Cladius pectinicornis (Geoffroy, 1785) *, Cladius ulmi (Linné, 1758) .

Distribution

Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Hungary, Latvia, Lithuania, the Netherlands, Norway, Poland, Sweden, U.K.

Figures

Fig. 7. Rhinotorus leucostomus (Gravenhorst, 1829). A. First metasomal tergite dorsally with projections at spiracles (arrows). B. Mesoscutellum. C. Propodeum. D. Face. E. Habitus.