Scirtes micronesianus Yoshitomi sp. n.

Figs. 1 A, 2A, 3

Type series. Holotype (BPBM): male, “Neauo, Weno Is., Chuuk St., F. S. Micronesia 1995. I. 7, leg. A & R. Iwata”. Paratypes (BPBM, BMNH, NMW, NSMT, EUM): 3 males & 10 females, same data as for the holotype, 1 female genitalia on slide no. HY 823; 1 male & 1 female, “Tunnuk→Wonip, Udot Is., Chuuk st., F. S. Micronesia 1995. I. 7. leg. A. & R. Iwata”; 1 male, “Sapeta, Fefan Is., Chuuk St., F. S. Micronesia 1995. I. 6 leg. R. Iwata”, genitalia on slide no. HY 937; 1 female, “Worowo, Rull Yap Is. MICRONESIA July 7, 1974 Y. Tomida leg.”; 1 female, “Tomil, Yap Is., MICRONESIA July 8, 1974 Y. Tomida leg.”; 7 males, “Moen Is. II- 27-67 ”, “guava”, “W. C. Mitchell Collector”; 2 males, “YAP: Dinay 21. XI. 1975 M. Lundgren Collector”, genitalia on. slide no. HY 950; 1 female, “YAP: Dinay 4. VI. 1976 ”, “M. Lundgren Collector”; 1 male, “Yap I., Yap. Hill Behind Yaptown Dec. 3. 1952 50m ”, “J. L. Gressitt Light trap”; 1 male, “YAP: Dinay 8. VII. 1976 Black light”, “M. Lundgren Collector”; 1 male, “MARIANA IS.: Guam, Barrigada X-’57, N. Krauss”; 1 male, “ Guam hocugilao”, “ 20-X-71 LA plante”, “Lot A6 Light”, “A. A. LaPlante Collection BISHOP Museum Acc. #1977.84”, genitalia on slide no. HY 951; 1 female, ditto, but “ 15-X-71 ”; 1 male, ditto, but “ 29-VII-1971 ”.

Description. Male. Body oval, slightly convex above, shining, closely covered with yellowish-white short setae throughout. Color of body mostly brown, but mouth parts, antennae and legs paler.

Head moderate in size, slightly convex dorsally, strongly punctate; clypeus long, expanded antero-laterally, anterior margin shallowly concave. Eyes moderate in size, prominent; the distance between eyes 1.7 times the maximum diameter of an eye. Antennae (Fig. 2 A) slender, short, reaching about proximal 1/6 of elytra; approximate ratio of each antennal segment (n = 1) as 1.7: 1.6: 1.0: 1.7: 1.6: 1.7: 1.6: 1.6: 1.4: 1.5: 1.8. Pronotum slightly convex above, punctate as head; antero-lateral corners rectangular, projecting anteriorly; front and lateral margins gently arcuate; postero-lateral corners about 120º; posterior margin gently bisinuate; PW/PL 2.33–2.86 (2.59). Scutellum moderate in size, an equilateral-triangule, punctate as head. Elytra oval, widest at the middle, punctate as pronotum; shoulders slightly elevated; EL/EW 1.31–1.53 (1.39); EL/PL 4.25–5.50 (4.86); EW/PW 1.22–1.47 (1.35); TL/EW 1.55–1.85 (1.68). Hind coxal plates subquadrate, distinctly projecting along postero-lateral corners, posterior margins concave. Legs relatively long. Hind tibial spurs relatively short, curved outward at apices, closely covered with minute setae; dorsal spurs about 2.3X length of ventral spurs, about 0.8X length of hind tarsal segment I.

Caudal margin of sternite VII (Fig. 3 A) concave. Tergite VIII (Fig. 3 B) moderately sclerotized, trapezoidal, bearing short spines along apical margin; tergite IX (Fig. 3 C) lightly sclerotized, with long apodemes. Tegmen (Fig. 3 D) large, moderately sclerotized, front margin concave; parameres obtuse at apices, closely punctate, lateral margin projecting triangularly. Penis (Fig. 3 E) moderately sclerotized, about 1.1X length of tegmen; pala oblong, arcuate in basal margin; parameroids short, almost straight, rather pointed apically; trigonium simply projecting, shorter than parameroids.

Female. Sexual dimorphism indistinct. Approximate ratio of each antennal segment (n = 1) as 1.8: 1.0: 1.1: 1.5: 1.5: 1.4: 1.5: 1.3: 1.3: 1.3: 1.4. PW/PL 2.34–2.76 (2.62); EL/EW 1.35–1.40 (1.38); EL/PL 4.76–5.36 (5.14); EW/PW 1.38–1.47 (1.43); TL/EW 1.61–1.68 (1.64).

Caudal margin of sternite VII (Fig. 3 F) shallowly concave. Tergite VIII lightly sclerotized, trapezoidal, with long apodemes; sternite VIII lightly sclerotized, U-shaped, bearing short setae along apical part. Prehensor (Fig. 3 G) as shown in figure; basal sclerite bicornute.

Measurements. Male (n = 12): TL 3.13–3.90 (3.41) mm; PW 1.35–1.68 (1.51) mm; PL 0.50–0.70 (0.58) mm; EL 2.55–3.20 (2.82) mm; EW 1.80–2.35 (2.03) mm.

Female (n = 5): TL 3.33–3.70 (3.52) mm; PW 1.45–1.58 (1.50) mm; PL 0.55–0.62 (0.57) mm; EL 2.78–3.10 (2.95) mm; EW 2.00–2.30 (2.14) mm.

Distribution. Micronesia (Yap Is., Chuuk state: Weno, Fefan and Moen Isls.), Guam.

Remarks. This species is closely related to Scirtes floresianus Champion, 1918 known from Indonesia (Flores Is.), and differs from it by the lacking thumb-like projections along the parameres of the tegmen, and the short parameroids of the penis.

Etymology. The species is named after the type locality.