Gonatocerus (Gahanopsis) arkadak Triapitsyn, sp. n.

Gonatocerus (Gahanopsis) arkadak Triapitsyn, sp. n.

(Figs 158–161)

Type material. Holotype female [UCRC ENT 162769] on slide labeled: 1. “ COLOMBIA: Amazonas, PNN [Parque Nacional Natural] Amacayacu, Matamata, 3°41’S, 70°15’W, 150 m (M. 847), 4.viii–11.ix.2000, A. Parente, MT”; 2. “ Gahanopsis Det. J. T. Huber 2001 ”. The holotype is dissected under 4 coverslips, with the mesosoma and metasoma mounted dorsoventrally, and lacking one hind wing and most of one middle leg. Paratype: ECUADOR. SUCUMBÍOS, Napo River, Sacha Lodge, 0°30’S 76°30’W, 270 m, 20–30.ix.1994, P. Hibbs [1 ♀ on card, CNCI].

Description. FEMALE (holotype). Body mostly brownish except face and scutellum yellowish to light brown; scape and pedicel light brown, flagellum brownish; legs light brown.

Antenna (Fig. 158) with radicle about 0.2x total length of scape, remainder of scape about 3.0x as long as wide; pedicel much longer than F1; funicle 7-segmented; F1, F3, and F5 much shorter (F1 the shortest) than remaining funicle segments and without mps; F2, F4, F6, and F7 subequal, mps on F2 (2), F4 (3), F6 (3), and F7 (4); clava 2.9x as long as wide, with 8 mps, almost as long as combined length of F6 and F7.

Mesosoma (Fig. 159). Mesoscutum, scutellum, and axillae finely sculptured; propodeum (Fig. 160) short, smooth. Forewing (Fig. 161) 3.2x as long as wide; longest marginal seta about 0.25x maximum wing width; forewing disc with a rather strong brownish tinge throughout except just behind submarginal vein, bare behind submarginal vein and densely setose elsewhere including behind marginal vein; macrochaetae on submarginal and marginal veins very strong. Hind wing (Fig. 161) about 13x as long as wide; longest marginal seta about 1.9x maximum wing width; disc with a brownish tinge and densely setose throughout except just behind apex of venation. Metafemur about 2.1x as long as wide.

Gaster much longer than mesosoma (Fig. 159); petiole very short, strap-like, inconspicuous, ovipositor long, 3.3x as long as mesotibia, projecting strongly forward under mesosoma (extending to mouthparts in the dry specimen and almost to base of propleura in the same slide-mounted specimen) and slightly exserted beyond apex of gaster by about 0.07x own length.

Measurements (µm) of the holotype. Total body length (of the dry specimen before slide-mounting): 693; head: 100; mesosoma 276; gaster 455; ovipositor 732. Antenna: radicle 18; rest of scape 81; pedicel 45; F1 17; F2 50; F3 21; F4 51; F5 24; F6 51; F7 49; clava 97. Forewing 707:221; longest marginal seta 58. Hind wing 646:48; longest marginal seta 89.

MALE. Unknown.

Diagnosis. Gonatocerus (Gahanopsis) arkadak sp. n. is characterized by the following unique combination: female antenna (Fig. 158) with funicle 7-segmented; F1, F3, and F5 much shorter than other funicle segments and without mps; F2, F4, F6, and F7 subequal and with mps.

Gonatocerus (Gahanopsis) deficiens (Ogloblin) is the only other known species of the subgenus to have a 7-segmented female funicle, but F2–F7 are more or less subequal in length and each has mps (Fig. 163).

Etymology. The species name (a noun in apposition) refers to the town of Arkadak in Saratovskaya oblast`, Russia, the original, home town of part of the family of the author of this species.

Hosts. Unknown.