Dinotrema angusticorne

Dinotrema angusticorne (Fischer, 1969)

(Figs 1, 2)

Aspilota angusticornis Fischer 1969a: 102; Yu et al. 2012.

Dinotrema angusticorne: Peris-Felipo and Belokobylskij 2016b: 3.

Aspilota bucculatricis Fischer 1969c: 62; Shenefelt 1974: 968; Marsh 1979: 220; Yu et al. 2012 (syn. nov.). Dinotrema bucculatricis: Peris-Felipo and Belokobylskij 2016b: 3.

Material examined. 1 male (paratype of D. angusticorne), " U.S.А., Cabin John, May. 1919, R.M. Fouts Collector " (NHMW); 1 female (paratype of D. bucculatricis), " U.S.А., Newfoundland, Squires, Mem., PK, 24.vii.1961, C.P. Аlexander leg." (NHMW).

Redescription. Female. Body 1.6 mm; fore wing 1.8 mm; hind wing 1.1 mm.

Head. In dorsal view, 1.7 × as wide as median length, 1.5 × as wide as mesoscutum, smooth. Eye in lateral view 1.4 × as wide as temple medially. POL 1.4 × OD; OOL 3.2 × OD. Face 1.8 × as wide as high. Clypeus 3.0 × as wide as high. Paraclypeal fovea reaching halfway distance between clypeus and eye. Mandible 1.4 × as long as its maximum width, widened towards apex. Upper tooth rather wide, shorter than lower tooth; middle tooth longer than upper tooth, thin, pointed apically; lower tooth short, subrounded. Аntenna more than 16-segmented (apical segments missing). First flagellar segment 3.3 × as long as its apical width. Second to third flagellar segments 2.5 × as long as their maximum width; fourth and fifth segments 2.1 times; sixth to 14th segments 1.7–1.9 × as long as their maximum width respectively.

Mesosoma. In lateral view 1.2 × as long as high. Mesoscutum (in dorsal view) 0.9 × as long as its maximum width. Notauli mainly absent on horizontal surface of mesoscutum. Mesoscutal pit present, oval-elongate. Prescutellar depression (scutellar sulcus) with distinct median and without lateral carinae. Precoxal sulcus present, crenulated, not reaching anterior and posterior margins of mesopleuron. Posterior mesopleural furrow smooth. Propodeum mainly smooth with complete median longitudinal carinae and with short subtransverse carinae emerging from median carina, but far distant from propodeal edges. Propodeal spiracles very small, its diameter 0.2 × as wide as distance from spiracle to anterior margin of propodeum.

Leg. Hind femur 4.1 × as long as its maximum width.

Wings. Radial (marginal) cell 4.3 × as long as its maximum width. Vein r2 (3-SR) 2.0 × as long as vein cuqu1 (2-SR); vein r3 (SR1) 2.7 × as long as vein r2 (3-SR).

Metasoma. First tergite weakly widened towards apex, 2.0 × as long as its apical width, weakly striate in apical half. Ovipositor 1.1 × as long as first tergite, clearly shorter than metasoma, 0.7 × as long as hind femur.

Colour. Body, antenna, mandible, legs and pterostigma brown to dark brown. Wings hyaline.

Male. Body 1.3 mm; fore wing 1.6 mm; hind wing 1.1 mm. Аntenna 20-segmented. First flagellar segment 3.8 × as long as its apical width. Radial (marginal) cell 3.9 × as long as its maximum width. Vein r2 (3-SR) 2.5 × as long as vein cuqu1 (2-SR); vein r3 (SR1) 2.3 × as long as vein r2 (3-SR). Hind femur 4.1 × as long as its maximum width. Otherwise similar to female.

Comparative diagnosis. This species is similar to D. clayensis (Fischer, 1969) and D. latitergum (Fischer, 1969). Dinotrema angusticorne differs from D. clayensis in having the eye in lateral view 1.4 × as wide as temple medially (1.1 × in D. clayensis), first metasomal tergite 2.0 × as long as its apical width (2.5 × in D. clayensis), radial (marginal) cell 4.3 × as long as its maximum width (3.8 × in D. clayensis), vein r2 (3-SR) 2.0 × as long as vein cuqu1 (2-SR) (2.7 × in D. clayensis) and vein r3 (SR1) 2.7 × as long as vein r2 (3-SR) (2.1 times × in D. clayensis). This species also differs from D. latitergum in having the eye in lateral view 1.4 × as wide as temple medially (1.1 × in D. latitergum), first flagellar segment 3.3 × as long as its maximum width (4.0 × in D. latitergum), propodeum mainly smooth with complete median longitudinal carinae and with short subtransverse carinae emerging from median carina, but far distant from propodeal edges (sculptured with carinae reaching propodeal edges in D. latitergum), radial (marginal) cell 4.3 × as long as its maximum width (3.6 × in D. latitergum), and vein r3 (SR1) 2.7 × as long as vein r2 (3-SR) (2.2 × in D. latitergum).