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Show 264 submerged detritus, among in mats of the moss gravel, usually in moderately Adults streams. have been to Fontanella, genus or swiftly flowing collected from late July to early September. Distribution Ephemerella spinifera is American Edmunds mens a boreal western North species previously reported (1962) from nine following are from two counties from Idaho localities. and forty I have localities by Allen and examined of speci- which the representative. BOUNDARY Co.: Round Prairie Cr. on U.S. Hwy. #95, Records.BONNER Co.: 9 mi. S. Canadian Border, 26-111-65, (N), AVN. Trout Cr., 10 mi. NW. Hope, 21-V11-64, (N), WFB, (UI); (+ 1). SHOSHONE Co.: South Fork Coeur d'Alene Riv. at jct. U.S. Hwy. #10, 3 mi. E. Mullan, 4-V1I-64, (N), AVN and WCP; LATAH Co.: (+ 1). Moscow, 8-VII-61, (A), R. E. Stecker, Goose Cr. at Summit, 20-VII-65, ADAMS Co.: (UI); (+ 1). (N), SDS-and ERL, (I). VALLEY Co.: Rock Flat Cr. on Ida. Hwy. #15, 2 mi. N. McCall, 24-111-65, (N), AVN; (+ 3). LEMHI Co.: Beagle Cr. nr. Yellowjacket R.S., 15 mi. SW. Cobalt, Salmon Natl. For., 28-VII-64, (N), CRWand IRT; Allen and North Fork Salmon Riv., 17 mi. N. North Fork (In: BLAINE Co.: Murdock Cr., 9 Edmunds, 1962:177); (+ 22). mL N. Ketchum, 24-VII-64, (N), SLJ, PSL, and FDI; Big Wood FREMONT CO.: Riv. (In: Ibid.); (+1). Targhee Cr. at jct. Ida. Hwy. #2P?{; at Henrys Lake, 20-VI-64, (N), SLJ and JWR. Subgenus Ephemerella Walsh, Of twenty-six to this E. aurivillii subgenus, North American four species, . (Bengtsson), . s.s. species presently assigned alIeni inermis Jensen and Eaton, and Edmunds, . lnfrequens |