Genus Rogas Nees, 1818

Rogas Nees, 1818: 306 (type species: (designated by Curtis 1834): Ichneumon testaceus Fabricius, 1798 [nec I. testaceus Gmelin, 1790; = Rogas luteus Nees, 1834]).

Pelecystoma Wesmael, 1838: 91; Shenefelt 1975: 1206–1209; Tobias 1976: 89; Marsh 1979 a: 178; Tobias 1986: 84–85 (included in Rogas auct). Syn. by van Achterberg 1982. Type species (designated by Foerster 1862): Rogas luteus Nees, 1834 [type lost]. Synonymy.

Rhogas Agassiz, 1846: 325 (invalid emendation).

Diagnosis.

Antenna with more than 50 flagellomeres. Maxillary palpus segment 3 strongly enlarged and laterally flattened in both sexes (Fig. 1 D, F), segment 4 distinctly expanded basally. Labial palpus segment 2 inflated. Propodeum with short mid-longitudinal carina medioanteriorly which divides to form a pair of near parallel submedial carinae. Hind wing veins 1 rs-m and M joining at an acute angle, much less than 75 °. Hind wing vein M 1.15–1.5 × longer than M + CU. Hind tibia with comb of modified setae distomedially (Fig. 2 B). Hind tibial spurs straight and evenly setose. Tarsal claws with large, dark, rather square basal lobe. Metasomal tergite 1 approximately 1.2 × longer than posteriorly wide. Dorsope present, large and deep; dorsal carinae of metasomal tergite 1 remaining separate or joined to form point (Fig. 2 E). Metasomal tergite 2 with wide polygonal midbasal area (Fig. 2 F); midlongitudinal carina variably present. Metasomal tergites 2–5 with sharp lateral crease. Female hypopygium ventrally nearly straight and posteriorly truncate.

Rogas was redescribed and illustrated by van Achterberg (1991), reproduced and slightly modified by Chen and He (1997), and the holotype of Rogas luteus was illustrated by van Achterberg (1991). Chen and He (1997) provide a key to Old World species.

Rogas may be distinguished from both Old and New World Triraphis by its maxillary palpi having the third segment swollen and laterally flattened having the swollen third segment (Fig. 1 D, F), the occipital carina being complete (although sometimes weak) ventrally and joining hypostomal carina (reduced ventrally, without ventral junction with hypostomal carina in Triraphis) (Fig. 1 C) (Ratnasingham and Hebert 2013), and with claws which have a large, dark square (truncate) basal lobe (small, acute and pale in Triraphis) (Fig. 2 C) (van Achterberg 1991; Chen and He 1997).

All reliable host records for Rogas are from Limacodidae caterpillars (Quicke and Shaw 2006). Published records from Zygaenidae result from failure to recognize Triraphis as a distinct genus (Quicke et al. 2003) and records from other families might result from misidentifications of Aleiodes species.