Taenionema oregonense (Needham & Claassen)

(Figs. 12, 21, 29, 37, 52, 60, 72, 81, 94, 107)

Distribution. Pacific Northwest (Oregon, Washington).

Material examined. Oregon: Clatsop Co., Nehalem River, 3.2 km southeast of Elsie on Spruce Run Co. Park Road, 1-III-1985, K.W. Stewart, 1♂ larva and 1♀ larva, 13♂, 2♀ (1♂ and 1♀ reared) ; Clatsop Co., South Fork Quartz Creek, Hwy. 26 bridge, approximately mile 25, 31-III-1983, 2♀ larvae; Clackamas Co., Vic Firewood Road, 6.5 km west of Oregon City, 17-III-1972, S.G. Jewett Jr., 8♂, 8♀ .

Characters. Color, pigmentation (Fig. 12), maxillae (Fig. 29), body, leg (Fig. 52) and cercal setation, and sexual dimorphism (Figs. 60, 72, 81) generally typical of genus. Body length 9-9.5 mm. Antennal segments broken (59+). Cercal segments broken (44+?). Male 9 th sternum (Fig. 94) broadly triangulate behind greatest width and apically pointed; anterior portion narrowly U-shaped with straight sides.