Hypseloecus sericosagus sp. nov.

(Figs. 5–7, 9 A–B)

Diagnosis. Recognized by its generally fuscous, comparatively shiny body, with yellow appendages; dorsal vestiture pattern (rather uniformly distributed golden-brown setae and patchily distributed scalelike setae as in Fig. 9 B); triangular head (Fig. 5); dark femora each with yellow apex; almost uniformly yellow tibiae; and peculiar form of endosoma (Fig. 10). Similar endosomal shape is exhibited by an Australian H. paramyemi Schuh & Menard, from which H. sericosagus is easily distinguished by the much smaller size and fuscous general coloration.

Description. Male: COLORATION AND VESTITURE: Body generally fuscous; dorsal surface rather shining, with widely distributed, reclining, golden-brown setae and patchily distributed, silky scalelike setae. Head shiny chocolate brown; vertex somewhat paler along inner margin of eye. Antenna wholly yellowish brown. Labium shiny reddish brown. Pleura as in Fig. 6; ostiolar peritreme obscured anteriorly. Hemelytron and membrane as in Fig. 9 B; membrane dark grayish brown with pale veins and irregular spots. Coxae as in Table 1. Leg whitish brown; all femora darkened with pale apices; all tibiae without spots or annulations. Abdomen shiny fuscous. STRUCTURE: Head narrow, triangular in frontal view; remaining structures as in generic description (see Schuh & Menard, 2011). Genitalia (Fig. 10): Left paramere with rather developed hypophysis. Endosoma broad, Jshaped, arranging brush-like structures distal to secondary gonopore. Female. Similar coloration and structure to male.

Measurements. ♂/♀: Total body length 2.1/ 2.1−2.4; length from apex of clypeus to cuneal fracture 1.71/ 1.71; width of head across eyes 0.78/ 0.81−0.84; head height 0.49/ 0.58−0.60; width of vertex 0.36/ 0.41−0.43; lengths of antennal segments I −IV 0.23, 0.81, 0.46, 0.60/ 0.21−0.24, 0.78−0.81, 0.38−0.39, 0.49−0.50; basal width of pronotum 0.98/ 0.97−1.07; maximum width across hemelytron 1.20/ 1.20−1.32; and length of metatibia 1.20/ 1.16−1.32.

Etymology. From Latin, sericus (= silk) in combination with sagus (= wearing); for this new species seems to wear a glossy silk gown.

Biology. Three adults were collected on Scurrula sp. growing from Homonoia riparia Lour., together with many individuals of H. castaneus and H. katrinae . But population density was much lower than the latter two at that moment.

Holotype. ♂, THAILAND: Nakhon Nayok: Sarika near Sarika Waterfall, 14˚18'32”N 101˚15'20”E ~ 14˚18'09”N 101˚15'38”E, on Scurrula sp., 22 Mar 2010, T. Yasunaga, K. Yamada (AMNH _PBI 00380260) (DOA).

Paratypes. THAILAND: Nakhon Nayok: 2♀, same data as for holotype (AMNH _PBI 00380261) (TYCN). Nakhon Ratchasima: 1♀, SERS, 14˚30'27”N, 101˚55'39”E, 410 m alt., light trap, 25 Sep 2013, T. Yasunaga (00380262) (TYCN).