| OCR Text |
Show 230 and Timpano5a guish the Needham. male imagos species occurring and following keys mature to thought or Keys The to the 1 occur Subgenera Male of nymphs the distin to subgenera and Idaho.l in and serve Species Imagos Cerci one-fourth to three-fourths as long median terminal filament sg. Caudatella, 6 Cerci and median terminal filament aube qua I in length 2 as ••• ••••••••••.••••••••••••••••• 2(1) Terminal six times segment of genital forceps as long as broad (Fig. 156) sg. Attenuatella, . •• •••••••••••••••••• marsarita Terminal segment of genital forceps less than four times as long as broad (Figs. 158-168) 3(2) 3 •••••••••.••••••••.•.•••••••••• of erminal segment genital forceps twice as long as broad and margin of second segment of forceps distinctly incurved or strongly bowed more than inner (Figs. 158-162) •.•••..•.•.•.•••. sg. 9 Drunella, Terminal segment of genital forceps lss than twice as long as broad and inner margin of second segment of forceps neither incurved nor strongly bowed (Figs. 163-168) 4(3) Penes with spines , IThe alIeni are 4 •••..••.•.•.•..•••...•......•.. (Figs. 163-166) ••••••.•••••••••••••••• male imagos of E. presently unknown. sg. ••.. Ephemerella s.s., 15 verruca, and E. male imagos-of also unknown, the subimagos orestes, E. Although-the undsi and E. cascadia are of these species-are herein described. |
