Oskoron brevichelis Shear, new species Figs. 1, 142–153 Types. Male holotype from Section 10, Transect 11S, Range 10W, 0.6 mi NW of Elk City, Yaquina River Valley, Lincoln Co., Oregon, collected 20 December 1971 by Ellen M. Benedict; three female paratypes from three separate Oregon localities, viz., Douglas Co., Section 20, Transect 23S, Range 10W, 1 mi. S, 2 mi W of Ash, 1100’asl, collected 11 December 1971 by Ellen M. Benedict; Section 23, Transect 26S, Range 2E, 3 mi S, 9 mi E of Steamboat on OR138, 1600’ asl; Lane Co., Transect 16S, Range 6E, 2 mi N, 7mi W of McKenzie Bridge on US 126, 1800’ asl, collected 28 February 1972 by Ellen M. Benedict. All types deposited in CAS. Diagnosis. Oskoron brevichelis, the smallest of Oskoron and Taracus species at maturity, can be separated from all others by the short chelicerae, as it is the only species in which the chelicerae are approximately the length of the body in males and shorter than the length of the body in females. The short chelicerae make this species appear smaller than it really is relative to its congeners. Etymology. The species epithet refers to the short chelicerae. Description. Male holotype from near Elk City. Total length, 2.25 mm. Carapace tan to light brown, merging at lateral margins into white, membranous cuticle; central region strongly domed; midline sulcus extends from anterior margin to ocularium. Ocularium as wide as long, rounded, with three stout, curved setae on tubercles above each eye; eyes large, black, ringed with black pigment. Metapelitidium sclerotized, appearing coalesced with carapace, with two setae on tubercles each side of sensory cone; sensory cone brown, acute, set in distinct socketlike patch of white cuticle. Abdomen soft, white or pale tan, with scutum parvum but lateral margins of scutum indistinct; scutum set with rows of curved, stout, small black setae raised on low plaques, these rows distinct anteriorly, becoming irregular posterior on scutum (Figs. 148–149). Ventrally, coxae tan, unspotted. Palpal coxae with 3 ...