Trichadenotecnum anomalum Yoshizawa & Lienhard, sp.n.

(Figs 1R, 25)

Holotype. Male, Singapore, Bukit Timah forest, 24 hr survey, section trap 5–9 am, 26.x.1969, D.H. Murphy (MHNG).

Description (note that the condition of the specimen is bad). Male. Head. Yellowish in ground color; vertical markings and orbital markings obscure; coronal suture black; epicranial suture faintly bordered with brown band dorsally; frons with faint.markings; eye black, IO/D= 1.1; ocelli white, ocellar field brown; gena mostly yellowish; postclypeus with seven rows of spots dorsomedially; anteclypeus brown. Antenna pale brown. Mouthparts brown.

Thorax. Prothorax brown. Mesonotum yellowish, lateral lobe of scutum with faint marking, anterolateral corners of scutellum brown. Metanotum yellowish, lateral lobe of scutum with faint marking, lateral corner of scutellum brown. Meso- and metapleuron pale brown except for white membranous regions.

Legs. Mostly pale brown, foretibia and tarsi of all legs darker.

Forewing (Fig. 1R). Hyaline, lacking almost all marking elements characteristics for Trichadenotecnum except following: opposing spots in cell r distinct, fused to single marking; basal band only distinct around Rs-M fusion and in cell cua.

Terminalia. 8th sternum with pair of sclerotized portions (Fig. 25 AC). Clunium (Fig. 25A) with broad lateral arms, about parallel sided and with strong dorsal expansion apically. Epiproct (Fig. 25 AB) strongly expanded dorsally and anteriorly over clunium, posteriorly with small conical projection medially; dorsal margin of epiproct lobe broad and posterior surface convex. Paraproct (Fig. 25A) with small distal lobe and with short and almost straight distal process directed posteriorly. Hypandrium (Fig. 25C) asymmetrical, without median tongue but with tongue-shaped projection medially near anterior margin, anterolaterally with pair of areas densely covered with tiny denticles, distally with two processes, one arises medially (= right process), acute conical in shape, the other arises left to this process (= left process), broad with diagonally truncated distal end; right posterolateral corner with denticulated longitudinal keel and with broadly expanded plate with serrated distal and internal margins. Phallosome (Fig. 25D) with broad distal margin slightly concave medially, about parallel sided and narrowing to pointed anterior end, lacking anterior process.

Measurements. B 1.5, Fw 2.0, Hw 1.5.

Female. Unknown.

Remarks. This species is very unusual in its forewing markings (Fig. 1R). Although density is variable, the forewings of all known Trichadenotecnum species are broadly spotted (Fig. 1 A-Q, S-U). Especially, in less heavily spotted species, six characteristic submarginal spots are always clearly visible, and this is considered to be an autapomorphy of the genus. In contrast, the forewings of T. anomalum are mostly transparent except for some markings in the basal half (Fig. 1R). The condition of the holotype specimen is poor, with many body markings faded. However, the basal band of the forewing can be seen clearly in the holotype so that absence of the marking characteristics of Trichadenotecnum, such as the submarginal row of spots, is probably not due to the poor condition of the specimen. The 9th tergite of T. anomalum possesses posterolateral arms (Fig. 25A), a character which is uniquely observed in Trichadenotecnum among Psocidae . Other diagnostic characters of the genus, such as the triangular areola postica, can also be seen (Fig. 1R). Therefore, the species is here considered as a member of Trichadenotecnum . The species seems to be closely related to T. apertum and its relatives because of the absence of the hypandrial median tongue and other resemblances of the terminal structures. The unique forewing markings are probably autapomorphic to this species.