34 Inurnors Narurat History Survey BULLETIN Vol. 26, Art. 1 
on apical tergites; penis lobes, fig. 66, with The nymph, fig. 59, was described by Ide 
lateral angles relatively blunt, slightly down- (1935a:113). 
curved; each cercus stained with gray- Known from central, eastern, and north- 
lavender near base, color paling to snow- eastern states and southeastern Canada. 
white toward apex. Most of the older published records of album 
60 62 
66 
Fig. 60.—Tortopus primus, male genitalia. Fig. 64.—Pentagenia vittigera, apex of fe- 
Fig. 61.—Potamanthus myops, male genitalia. male abdomen, ventral aspect. 
Fig. 62.—Pentagenia vittigera, male genitalia. Fig. 65.—Ephemera varia, male genitalia. 
Fig. 63.—Ephemera simulans, male genitalia. Fig. 66—Ephoron leukon, male genitalia. 
Fig. 67.—Ephoron album, male genitalia. 
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