Ypsiloncyphon wallacei Yoshitomi, 2015, sp. n.

Ypsiloncyphon wallacei sp. n.

(Figs. 26 A, 27)

Type material. Holotype (NHM): male, “ INDONESIA: SULAWESI UTARA, Dumoga-Bone N. P. February 1985.”, “Rothamsted light trap, site 1, 200 m. H. Barlow”, “R. Ent. Soc. Lond. PROJECT WALLACE B. M. 1985- 10”.

Description. Male. Body (Fig. 26 A) oval, strongly convex dorsally, shiny, closely covered with silver setae. Coloration of body light brown, but antennae and mouthparts paler.

Head relatively large, flat dorsally, finely punctate, straight front margin of clypeus. Eyes large, prominent; the distance between eyes about 2.5 times as long as the maximum diameter of an eye. Antennae long and slender, reaching about proximal 1/3 of elytra. Pronotum densely punctate, depressed in lateral parts; anterior, posterior and lateral margins gently arcuate; antero- and postero-lateral corners obtuse; PW/PL 2.05. Scutellar shield finely punctate, equilaterally triangular. Elytra oval, widest at the middle, evenly arcuate in lateral margins, punctate as on pronotum; humeral parts slightly projecting dorso-laterally; apices right-angled; EL/EW 1.30; EL/PL 3.76; EW/ PW 1.41; TL/EW 1.65. Legs relatively long and slender.

Caudal margin of sternite VII (Fig. 27 A) gently arcuate. Tergite VIII (Fig. 27 B) moderately sclerotized, trapezoidal, bearing short spines along caudal margin, with a pair of long and slender apodemes. Tergite IX (Fig. 27 C) lightly sclerotized, trapezoidal, projecting antero-mesally in postero-lateral corners, with a pair of long and slender apodemes. Sternite IX (Fig. 27 E) well sclerotized, very long U-shaped, with some keels in apical parts, pointed at apices. Tegmen (Fig. 27 D) well sclerotized, Y-shaped, bifid in apical 1/2, pointed at apices. Penis (Fig. 27 F) long, well sclerotized, about 1.3 times as long as tegmen; pala short, widened in basal part; parameroids consisting of a long plate, subparallel-sided from base to apical part, rounded at apex, punctate in apical part; trigonium relatively short and slender, protruding ventro-anteriorly from basal 1/2 to 1/4.

Female. Unknown.

Measurements. Male (n = 1): TL 1.81 mm; PW 0.78 mm; PL 0.38 mm; EL 1.43 mm; EW 1.10 mm.

Distribution. Indonesia (Sulawesi Isl.).

Remarks. This species is easily distinguishable from the other species of this genus by the shape of the penis in which the parameroid is long and subparallel-sided and the trigonium is long and slender.

Etymology. The species is named after Alfred Russel Wallace (1823–1913) for his great contribution to the zoogeography of the Oriental Region.