| OCR Text |
Show to in Idaho. occur Ephemerella (Attenuatella) margarita Needham (Figure 156) Ephemerella Needham from collected (1927b) describd Edmunds, several localities the associated species from nymphs this in and Utah, McDunnough from Alberta. imagos (1961b) provide descriptions and Edmunds and Allen • (1931c) correctly mature 1927b:114; Needham, mararita 1961b:16 of the Allen and adults nymphs. Taxonomy and Biology known to the species is This occur in Idaho given in the keys. identified by the short ters and In from dimorphism; 7.5-9.0 nymphs and size are display mm. and a ymphs more of and moss covered from in color rocks (2-3 mm.) 5.5-7.0 color easily that are distinct display mm. than are The male the females pattern. streams and are charac- ranging in body length species usually and nymphs also nymphs females darker rivers the filaments males striking this moderately flowing silt the usually much addition, The the subgenus easily distinguished by caudal distinctly curved ventrad. sexual is the of only representative occur uncommonly in along the margins among gravel. They have been |
