Trachyserphus Kolyada

Kolyada, Victor & Mostovski, Mike B., 2017, Revision of the genus Hormoserphus Townes, 1981 (Hymenoptera: Proctotrupidae), with description of Trachyserphus gen. n. and a new species, Zootaxa 4254 (5), pp. 575-583 : 577-578

Genus Trachyserphus Kolyada , gen. n.

LSID: urn:lsid:zoobank.org:act:BF15A2E4-9A26-4B0C-AC7C-E2C53E3BB936

Type species. Hormoserphus segregatus Townes, 1981 .

Etymology. The generic name is formed from Greek τραχύς (coarse) and the ending - serphus traditionally used in Proctotrupidae .

Diagnosis. Body stout, compact. Apical margin of clypeus simple and not bordered by longitudinal keels. Distance between antennal sockets greater than their diameter. Distance from lower edge of clypeus to centre of tentorial pit 0.8–0.9 of distance to lower edge of antennal socket. Mandible moderately stout, unidentate. Malar sulcus present. Occipital carina present, not reaching oral carina. Notauli moderately developed, curved, traceable to almost mid mesoscutum, approximately as long as or longer than tegula. Pronotal shoulder very well developed, broadly rounded, with neither keels nor wrinkles. Pronotal scrobe with coarse vertical wrinkles. Epomia simple and not extending to pronotal shoulder. Scutellar pit with no inner keels. Horizontal mesopleural groove complete, well developed. Metapleural sulcus present. Longer spur of hind tibia reaching 0.5–0.7 length of hind basitarsus. Stigma deep, r–rs unexpressed, radial vein starting at lower edge of stigma. Costal vein ending at apex of radius. Mediocubital crossvein at base of fore wing expressed as sclerotized vein section or absent. Abdomen stalkless. Syntergite edges overlapping ventrally, meeting over synsternite along its posterior third.

Comparison. The new genus is similar to Brachyserphus and Oxyserphus and differs from both as following:

1 Distance from lower edge of clypeus to centre of tentorial pit half the distance to lower edge of antennal socket ( Fig. 1 A); if the former two-thirds of the latter, distance between antennal sockets markedly less than their diameter or mandibles bidentate ( Fig. 1 B). Apical edge of clypeus strong and bordered by one or several longitudinal keels ( Fig. 1 B). Stigma with short r–rs (vertical part of radius).................................................................. Oxyserphus Masner

- Distance from lower edge of clypeus to centre of tentorial pit 0.7–0.9 of the distance to lower edge of antennal socket ( Fig. 1 D). Distance between antennal sockets noticeably greater than or rarely equal to their diameter ( Fig. 1 D). Mandibles simple, unidentate ( Fig. 2 D). Apical edge of clypeus simple and not bordered by longitudinal keels ( Figs 1 D, 2D, 3D, 4G). Stigma devoid of r–rs (vertical part of radius) ( Figs 2 N, 3H, 4H)......................................................2

2 Notauli curved and may reach almost mid mesoscutum as traces, about as long as tegula or longer ( Figs 2 G, 3C, 4D). Malar sulcus present ( Figs 2 D, 3D, 4G). Epomia simple and not extending to pronotal shoulder ( Figs 2 A, 3A, 4A). Metapleural sulcus present ( Figs 2 B, 2C, 3B, 4C)........................................................ Trachyserphus gen. n.

- Notauli straight and short, reach about ¼ mesoscutum, half as long as tegula ( Fig. 1 E). Malar sulcus absent ( Fig. 1 D). Epomia bifurcate dorsally and extending to pronotal shoulder. Metapleural sulcus absent................... Brachyserphus Hellén

The identification key to genera of the Cryptoserphini ( Townes & Townes 1981: 29–32) is outdated and badly needs revision, but lies beyond the scope of the present paper. Nevertheless, Trachyserphus gen. n. would run to couplet 12 (ʻ Hormoserphus ʼ) if one takes the second lead of couplet 9 assuming that the notauli are ʻshortʼ (not reaching the midlength of the mesoscutum vs extending to almost its rear edge).

Figures

FIGURE 1. The head, frontal view (A, B, D), habitus, lateral view (C) and mesonotum, dorsal view (E) of some proctotrupids. A, Oxyserphus sp.; B, C, Oxyserphus clypeatus; D, E, Brachyserphus sp. Scale bars 0.1 mm in all figures except for 1 mm in Fig. 1 C. (Photo of Proctotrupes clypeatus Ashmead, 1893 holotype USNM 11711 [USNMENT 01223753] on Fig. 1 C courtesy E. J. Talamas)

FIGURE 2. Trachyserphus segregatus. A, pronotum laterally; B, C, female and male propodeum laterally; D, female head frontal view; E, F, male head dorsally; G, mesonotum dorsally; H, I, general habituses of male and female in lateral view; J, female antenna; K, ovipositor sheath; L, male antenna; M, hind leg; N, wing venation. Scale bars 0.1 mm in all figures except for 1 mm in Figs 2 H, 2 I.