Arrhopalites alticola

Material examined: holotype ♀ and 2 paratypes ♀♀, 14 ­ viii­ 1967. JAPAN, Nagano, Shigakogen. Yosii leg. Muséum dhistoire Naturelle, Ville de Genève (MHN). Principalis­group (Fig. 1, A­J). Body setae as shown in figure C. Antennae of holotype ~ 2 X as long as the cephalic diagonal. Ant. IV with five subsegments, apex with a capitate sense rod. Ant. III slightly swollen basally; sense organ (Fig. B) with 2 parallel sense rods in a single shallow pit; seta Aai club­shaped and blunt; Api and Ape slender and acuminate; Ae short and acuminate; Ap and Ai as a normal elongate setae. 1 + 1 eyes in a dark pigment patch, pigment sparse all over the body. Dorsal cephalic setae not spinelike, M 5 absent (Fig. I). Metatrochanteral organ (seta D 2) elongate (Fig. F). Second and third ungues with an inner tooth and a weak tunica. First and second unguiculi with corner tooth, and apical filament exceeding unguis tip (Figs. J, a­b). Corpus tenaculum with two setae (Fig. G). Dens with 7 dorsal E setae, E 1 and E 3 spinelike; L 1 ­ 3 spinelike; D 1 ­ 2 and Id 1 ­ 4 present (Fig. D); 4 ventral setae rows (3,2,1,1) present (Fig. D). Mucro narrow, gutter­like, both edges serrate (Fig. E). Anal valve without cuticular spines; setae C 1 ­ C 8 not swollen basally chaetotaxy (Fig. H). Female subanal appendage apically branched. Biogeographic zone 3 a. Remarks: This species is similar to A. kolymensis in several features, Ant. IV subsegments number, dental setae E 1 and E 3 strongly spinelike, female subanal appendage shape, and can be distinguished from it by the Ant. III basal swelling, lacking cephalic spines and dental Id 3.