Arrhopalites ezoensis sp. n. (Fig. 3, A­J)

Etymology. Unknown, this name was suggested by Dr. R. Yosii in the slide of the type material.

Type Material. Holotype female ♀, JAPAN, Hokkaido, Nukabiravi Hidaka. 29­vii­ 1971. R. Yosii, Muséum dhistoire naturelle, Ville de Genève. Paratype female ♀ in the same slide with the Holotype.

Description. Pygmaeus­group s. str. Body sparsely clothed with short setae on anterior part of abdomen (Fig. C, a). Posterior part of the abdomen with setae 1.5 X as long anterior anterior setae (Fig. C, b). Antennae of holotype ~ cephalic diagonal. Ant. IV ~ 2X as long as Ant. III, not subdivided (Fig. A); longest setae 0.75X the width of segment; Ant. IV apex with a capitate sense rod (Fig. A). Ant. III swollen basally; sense organ (Fig. B) with 2 parallel sense rods in a single shallow pit; seta Aai club­shaped and blunt; seta Api short and acuminate, Ape slender and acuminate; Ae, Ap and Ai normal elongate setae. 1+1 eyes. A3, M4 and L and IL series spinelike, M5 absent (Fig. I). Metatrochanteral organ (seta D2) elongate (Fig. F). All ungues with inner tooth and no tunica (figs. J, a­c). All unguiculi with corner tooth, first unguiculus with apical filament reaching the unguis tip (Fig. J, a). Corpus tenaculum with one seta (Fig. G). Dens with 5 dorsal E setae, E1­4 spinelike, E5 normal; L1 and L2 spinelike, L4 absent; D1, D2, Id1, Id2, Id3 and Id4 present (Fig. D); 4 ventral rows of setae (3,2,1,1) present (Fig. D). Mucro narrow, gutterlike, both edges serrate (Fig. E). No cuticular spines on anal valve; C series normal, chaetotaxy (Fig. H). Female subanal appendage thick, straight with serrate apex. Total length of the adult female holotype 0.9mm.

Distribution. Biogeographic zone 3a.

Remarks: Arrhopalites ezoensis n. sp. is a Japanese surface species of the pygmaeusgroup s. str. (Bretfeld, 1999) similar to A. diversus Mills 1934, A. slovacicus Nosek 1975 and A. styriacus Nosek & Neuherz 1976. The feature that holds those species together is the presence of a single seta on the corpus tenaculum. A. ezoensis n. sp. differs from the others in having the undivided fourth antennal segment and corner tooth on all unguiculi; also in the anal valve chaetotaxy, the absence of D5, D10 and E8 setae as well as the female subanal appendage.