Trichadenotecnum waykananense

Trichadenotecnum waykananense View in CoL n.sp.

Figs. 18–23

Material examined. HOLOTYPE ♀, Sumatra: SE, Way Kambas National Park , Way Kanan , 5°06'S 105°49'E, mixed secondary forest , 20 m, 2.VII.1997, ESK ( ZMB). GoogleMaps PARATYPES, Sumatra: SE, WKNP , Kali Biru , 4°57'S 105°50'E, mixed secondary forest , 20 m, 4♀♀, 2.VII.1997, ESK (one each to ZMB, AMS K196199); GoogleMaps South, Tanjung Bintang , 5°10'S 105°28'E, rubber plantation , 250 m, 1♀, 19.XII.1995, ESK; GoogleMaps North, LRNP , Lawe Gurah , 3°38'N 97°40'E, mixed secondary forest , 325–360 m, 1♀, 5.VI.1997, ESK. GoogleMaps

Male unknown.

Female

Colouration (c. 4 years in alcohol). Head yellowish. Epicranial suture dark brown with confluent brown patches each side across posterior margin of vertex and mesial to each orbit. Eyes greyish black. Ocelli pale black centripetally. Dark brown spot between eyes and lateral ocelli; anterior to this spot, a dark brown stripe toward anterior of eyes angled toward epistomal suture and merging with lateral dark brown mark on frons, appearing as a hook-shape. Epistomal suture pale. Clypeal striae dark brown, merging medially, appearing as yellowish area laterally. Gena with parallel dark brown bands ventral to orbit. Anteclypeus dark brown. Labrum whitish brown. Maxillary palp yellowish except apical segment dark brown. Antenna brown. Thorax generally yellowish, brown on thoracic scutella and centre of mesothoracic antedorsum. Fore wing as in Fig. 18 with distinct brown clouds. Hind wing (Fig. 19) suffused brown. Legs pale brown.

Morphology. IO:D 1.88. Fore wing venation as in Fig. 18. Subgenital plate (Fig. 20) with long posterior lobe tapering to blunt apex, row of long setae on apical margin; disc with acuminate sclerotized spine each side of apical lobe, hook-shaped pattern of sclerotization anterior to each spine. Gonapophyses (Fig. 21): dorsal valves very short, with long apical spine; ventral valve broad with long setose apical spine; outer valve broad with short posterior lobe and very long stout setae towards its apex and row of shorter setae on posterior margin. Epiproct missing. Paraproct (Fig. 22) with field of about 21 trichobothria. Spermapore plate (Fig. 23) with heavy broad sclerotized area anterior to spermapore.

Dimensions. B 2; FW 2.6; HW 1.96; F 0.53; T 1.5; t 1 0.29; t 2 0.11; t 1 /t 2 2.64; Ct 21 (t 1) 2 (t 2); f 1 0.55; f 2 0.54; f 1 /f 2 1.01.

Remarks. The wing markings of this species conform to those of typical representatives of Trichadenotecnum. The subgenital plate resembles that of T. laticornutum Endang et al. (2002) by having lateral horn-shaped projections on the posterior margin, but the posterior lobe is longer than that of T. laticornutum. The general form of the gonapophyses is also similar in the two species but the outer valve of T. waykananense has a distinctly deeper posterior lobe than that of T. laticornutum, which is shallow. The fore wing of T. waykananense has a distinct brown sub-apical spot in each outer cell and the membrane is darkened on the apical margin, whereas in T. laticornutum the sub-apical brown patches are not clearly separated and the membrane is not darkened apically. Furthermore, the basal transverse fascia in the fore wing of T. laticornutum is broad and reaches the anterior margin of the wing, whereas in T. waykananense it is interrupted and only reaches vein Cu 1.

This appears to be a lowland species.