Genus Dinostigma Fischer, 1966

Dinostigma Fischer, 1966: 182; Shenefelt 1974: 991; Wharton 1980: 38; van Achterberg 1988: 19; Yu et al. 2016.

Type species.

Dinostigma muesebecki Fischer, 1966, by monotypy (Figs 10, 11).

Material examined.

Holotype ( Dinostigma muesebecki). United States Of America: • ♀, North East, Pa. [= Pennsylvania], No 9019, 6. vii. 1912 (F. Johnson leg.) (NMNH).

Diagnosis.

Mandible small, simple, tridentate. Paraclypeal fovea short, far from reaching inner margin of eyes. Mesoscutum without mesoscutal pit; notauli present only in anterior part of mesoscutum; precoxal sulcus absent; propodeum always smooth; spiracles of propodeum large. In fore wing, marginal cell never shortened; vein r originating from basal quarter of pterostigma; vein 2 - SR absent; vein cu-a postfurcal; first subdiscal cell open distally (without vein 2-1 A). Hind wing with all cells open. Metasoma of ♀ more or less distinctly compressed laterally. Ovipositor sheath shorter than metasoma.

Remarks.

After careful revision of former Dinostigma and Eudinostigma (as subgenus of Dinostigma) species, only the type species of this genus, Dinostigma muesebecki Fischer, 1966, is retained in Dinostigma . The species D. stenosoma (van Achterberg, 1988) is transferred to the genus Dinotrema as a type species of the new subgenus, Pseudoprosapha subgen. nov. (see below), because this species has the first subdiscal cell of fore wing closed, the pterostigma broad and wider than vein r length, and all cells of the hind wing closed ( Dinotrema (P.) stenosoma (van Achterberg, 1988), comb. nov.).

This genus is very close to the Oriental-Afrotropical Lysodinotrema Fischer, 1995, because both of them share, among others, such main diagnostic characters as simple tridentate mandible, short paraclypeal fovea, and mesoscutum without medio-posterior pit. However, the lack of closed cells in the hind wing in Dinostigma (present in Lysodinotrema), absence of vein 2 - SR (present in Lysodinotrema), and absence of the precoxal sulcus (present in Lysodinotrema) are sufficient to separate both as different genera.