Trichadenotecnum alobum

Trichadenotecnum alobum View in CoL n.sp.

Figs. 50–53 View Figs

Material examined. HOLOTYPE ♀, Sumatra, Kerinci Seblat National Park , Gunung Tujuh , 1°43'S 101°13'E, 1600 m, mixed secondary forest , 23.I.1997, ESK ( ZMB) GoogleMaps .

Male unknown.

Female

Colouration (c. 4 years in alcohol). Head ground colour yellowish. Epicranial suture light brown with brown spots each side extending to posterior margin of vertex, and mesial to each orbit. Ocelli pale, black centripetally. Eyes greyish black. Frons with median dark brown stirrup mark, lateral to this two brown bands from epistomal suture towards each orbit. Gena yellowish brown. Antenna brown except scape and pedicel dark brown, and pale between joints of flagellar segments. Epistomal suture light brown. Postclypeus with dark brown striations. Basal ¼ of anteclypeus dark brown, otherwise pale. Labrum and maxillary palp dark brown. Thorax brown with yellow patches on dorsal lobes. Legs brown, pale between joints. Fore wing ( Fig. 50 View Figs ) with very dense brown spots. Hind wing (damaged) brown.

Morphology. IO:D 3.5, eyes small. Fore wing venation as in Fig. 50 View Figs . Subgenital plate ( Fig. 51 View Figs ) with short posterior lobe, squarish apically, bearing apical row of long setae, field of short setae on mid line between main plate and lobe. Gonapophyses ( Fig. 52 View Figs ) ventral valve elongate, pointed apically, dorsal valve broad, with long acuminate apical spine, outer valve narrow, ovoid, lacking posterior lobe. Epiproct and paraproct as in Fig. 53 View Figs .

Dimensions. B 1.98; FW 2.4; HW (damaged); F 0.43; T 0.92; t 1 0.28; t 2 0.1; t 1 /t 2 2.8; Ct 16 (t 1) 2 (t 2) f 1 0.4; f 2 0.38; f 1 / f 2 1.05.

Remarks. In genitalic features T. alobum most closely resembles T. godavarense New from Nepal, in having an ovoid outer gonapophysis valve and a broad dorsal valve with a long acuminate apical spine. The ventral valve of T. godavarense, however, is decidedly the shorter. The subgenital plates of both species have short squarish apical lobes with a row of long setae along the apical margin, but the main plates differ, the deeply bifurcate sclerotized region of T. godavarense being distinctive. The absence of a posterior lobe to the outer gonapophysis valve was regarded byYoshizawa (2001) as an apomorphy for the spiniserrulum group but T. alobum also has a long ventral valve, unlike typical members of that group.