Idiogramma elbakyanae Khalaim, 2017

Khalaim, Andrey I. & Ruiz-Cancino, Enrique, 2017, Ichneumonidae (Hymenoptera) associated with xyelid sawflies (Hymenoptera, Xyelidae) in Mexico, Journal of Hymenoptera Research 58, pp. 17-27 : 22-25

Idiogramma elbakyanae Khalaim sp. n.

Figs 8-11

Comparison.

The new species differs from all Nearctic species by the occipital carina absent dorsally and laterally (Figs 10 , 11 ); the mandible strongly tapering apically (Fig. 9 ), in dorsal view unspecialized, convex (turned outwards in other species except I. euryops - as in Fig. 7 ); and the entirely black frons (Figs 10 , 11 ).

In addition, I. elbakyanae differs from the three species occurring in the Palaearctic region ( Kasparyan and Tolkanitz 1999) by its extremely long ovipositor, shorter first tergite, strongly tapered mandibles and dorsally absent occipital carina (in I. euryops this carina is sometimes weak or vestigial mediodorsally); it also differs from I. alysiina and I. euryops by the head, in dorsal view, with long and prominent genae; and from I. eurum and I. euryops by the fuscous face (yellow in the two other species).

Description.

Female. Body length 3.8 mm. Fore wing length 3.9 mm.

Head prominent, strongly rounded behind eyes in dorsal view (Fig. 10 ); gena 1.1 times as long as eye width. Ocellar index 1.8. Clypeus very broad and short, separated from face by deep and sharp groove, with upper margin somewhat convex medially and lower margin slightly concave (Fig. 9 ), strongly convex in lateral view. Mandible strongly tapered in basal half, 2.6 times broader basally than apically (at level of base of teeth), with raised flanges on lower and upper margins; upper tooth longer than the lower; mandible in dorsal view convex, unspecialized. Malar space very short, upper corner of mandible almost touching eye margin (Fig. 9 ). Antennal flagellum slender, slightly tapered towards apex, with 23 flagellomeres; flagellomere 1 slightly swollen basally. Face with rather strong prominence medially, finely punctate with smooth and shining interspaces between punctures. Frons, vertex and genae polished, with scattered fine punctures. Vertex weakly convex, not impressed along midline (Figs 10 , 11 ). Occiput dorsally conspicuously impressed medially (Fig. 11 ). Occipital carina present ventrally, completely absent lateraly and dorsally.

Mesoscutum polished, with scattered fine punctures. Notaulus deep and sharp on anterolateral side of mesoscutum. Epicnemial carina extending somewhat above the level of lower corner of pronotum, not reaching anterior margin of mesopleuron. Me sopleuron smooth and shining, with very fine and sparse punctures. Propodeum with median longitudinal carinae distinct, convergent anteriorly; propodeum dorsally with transverse wrinkles between median longitudinal carinae; lateral longitudinal carinae weak but distinct.

First tergite slightly transverse, almost 0.9 times as long as posteriorly broad, in lateral view with upper margin evenly convex; lateromedian carinae distinct in basal half. Second tergite strongly transverse. Ovipositor very long, flexible, at apex with distinct nodus and fine teeth ventrally (Fig. 8 ); sheath about 4.2 times as long as hind tibia.

Head brownish black to black; lower part of genae and face medially slightly yellowish; clypeus and mandible (except black teeth) yellow; mouthparts yellow with two apical segments of maxillary palp and one apical segment of labial palp fuscous. Antennal flagellum black, slightly paler basally; scape and pedicel brownish black, yellowish ventrally and with extreme apical margin yellow dorsally. Mesosoma entirely brownish black; tegula yellow. Pterostigma brown. Legs predominantly brown; fore coxa yellow, slightly brownish basally; mid coxa pale brown; fore and mid trochanters yellow; fore and mid femora and hind trochanters yellow to brown. Metasomal tergites dark brown, tergites 2 to 7 with hind margin dorsally widely and laterally narrowly emarginate with yellow (Fig. 8 ).

Male. Very similar to female but metasoma basally more slender, tergite 1 almost twice as long as posteriorly broad, tergite 2 subquadrate and yellow markings on tergites 2-7 generally narrower (especially on tergite 2). Occipital carina sometimes dis cernible ventro-laterally. Face sometimes yellowish medially and laterally. Measoma and legs sometimes darker.

Material examined.

Holotype female (UNAM), Mexico, Tlaxcala, Nanacamilpa, Ejido Los Búfalos, N 19°28', W 98°35', bosque Pino-Encino ( Pinus + Quercus forest), 2830-2900 m, Malaise trap, 4.IV-3.V.2016, coll. Y. Marquez & A. Contreras.

Paratypes. 4 males (BMNH, UAT, UNAM, ZISP), same data as holotype .

Etymology.

The species is named in honour of Alexandra Elbakyan (Kazakhstan/Russia), creator of the web-site Sci-Hub, in recognition of her contribution to making scientific knowledge available for all researchers.

Distribution.

Central Mexico (Tlaxcala).

Figures

Figures 8 - 11. Idiogramma elbakyanae sp. n., holotype female 8 habitus (without antennae and wings), lateral view 9 head, antero-ventral view 10 head, dorsal view 11 head, dorso-lateral view.

Figures 1 - 7. Gelanes horstmanni sp. n., holotype female (1, 2, 4, 5) and paratype male (3). 1 body, lateral view 2 head with antenna and mesosoma, dorso-lateral view 3 head, dorsal view 4 head, antero-ventral view 5 apex of ovipositor, lateral view. Idiogramma comstockii, female 6 head, antero-ventral view 7 head, dorso-lateral view.