Trichadenotecnum adika Endang, Thornton & New

Sri Kentjonowati Endang, 2005, The Genus Trichadenotecnum (Insecta: Psocoptera: Psocidae) in Sumatra, Indonesia, With Description of Thirteen New Species, Records of the Australian Museum 57, pp. 15-38 : 21-22

Trichadenotecnum adika Endang, Thornton & New

Figs. 2–6

Trichadenotecnum adika Endang et al., 2002: 166.

Material examined. Sumatra: West, Batuampar, tea plantation, 1°44'S 101°20'E, 1360 m, 1♂, 3♀♀, 21.I.1997; 1♂, 1♀, 19.VI.1997, ESK. West, PTPN VI, tea plantation, 1°46'S 101°22'E, 1460 m, 1♂, 2♀♀, 19.VI.1997, ESK (vouchers of each sex to ZMB, AMS).

Female

Colouration (after c. 3 years in alcohol). Head yellowish. Epicranial suture dark brown, dark brown confluent patches each side extending to posterior margin of vertex and mesial to each orbit. Eyes greyish black. Ocelli pale, black centripetally. Brown spot each side adjacent to lateral ocelli. Dark brown stripe from median ocellus toward orbits. Frons with dark brown stirrup-shaped mark and lateral curved dark brown mark. Antennal socket bordered with dark brown band. Antenna light brown, except ventral side of scape and pedicel dark brown. Gena yellowish, with dark brown curved band from ventral margin toward antennal socket. Epistomal suture brown. Clypeal striae dark brown, merging anteriorly, paler lateroanteriorly. Dorsal half of anteclypeus dark brown, otherwise whitish. Labrum dark brown. Maxillary palp dark brown, intersegmental areas pale. Thorax: dorsal lobe brown pale along suture; antedorsum of mesothorax yellowish brown with median pale band; lateral lobe dark brown. Fore wing with brown spots as in Fig. 2. Hind wing (Fig. 3) suffused brown. Legs: coxa and femur dark brown, tibia and tarsal segments light brown, joints pale.

Morphology. IO:D 2.5, eyes small. Fore wing (Fig. 2): first and second sections of vein Cu 1a in a straight line; angle of divergence of arms of radial fork about 90°; Ct 20 (t 1) 2 (t 2); subgenital plate (Fig. 4): posterior lobe long, not tapering apically and with long apical setae, two long setae in the middle of the posterior lobe; main plate setose, with lateral conical spiculate projections. Gonapophyses (Fig. 5): dorsal valve with small fine setae on dorsal margin apically, narrow finely setose apical tine; ventral valve short, with bluntly ending narrow apex; outer valve transverse with short posterior lobe and bearing long setae. Epiproct (Fig. 6) trapezoidal with lateral sclerotized prong. Paraproct (Fig. 6) with field of about 23 trichobothria.

Remarks. Endang et al. (2002) described this species from a single male specimen collected from Bandung, West Java, at an elevation of 700 m. The female was then unknown. Trichadenotecnum adika has a Loensia type fore wing pattern (with many small pigment spots over the whole wing membrane and no or indistinct larger submarginal spots in the outer cells) (Thornton, 1961). The material examined above differs from any other Oriental species in details of hypandrium and phallosome. The Sumatran males are clearly referable to T. adika and were captured with six females (in three separate samples), so that the sexes are associated clearly. In subgenital plate features, the species resembles T. laticornutum (Endang et al., 2002) in having a lateral sclerotized horn-shaped projection on the main plate. The size and shape of this projection, however, is somewhat different; in T. adika it is short, tapering distally and conical, whereas in T. laticornutum it is long and acuminate distally. Trichadenotecnum paradika n.sp., described below, also has a subgenital plate of this rather unusual form.

The posterior lobe of the subgenital plate of T. laticornutum is shorter than that of T. adika. Furthermore, T. laticornutum has a wing pattern conforming to Trichadenotecnum Enderlein sensu stricto, whereas the pattern in T. adika is Loensia -like, as is that of T. paradika. The above females are clearly referred to T. adika on head and fore wing pattern and in general colouration. Trichadenotecnum adika was taken only at high elevations.