EPHEMERA. 39 



ous, pubescent, longer than the body ; wings subcinereous, the 

 anterior ones maculated and subfasciated with fuscous, the apex 

 and posterior margin not maculated ; veins cloudy. (From Mr. 

 Walker's description.) 



Length of body 12 millim. Alar expanse 31 millim. Setas 14 

 millim. 



Hah. St. Lawrence River. 



Is it not a female subimago? I have seen the specimen described 

 and noted "that it was allied to E. vulgata, but smaller." 



3. E. hebes. 



Ephemera hebes "Walk. Catal. 538, 8. 9 Subimago. 



Piceous; antennae black; feet testaceous, anterior ones fuscous; 

 setae fusco-testaceous ; wings cinereous, veins black. (From Mr. 

 Walker's description.) 



Length of body 9 millim. Alar expanse 22 millim. 



ffab. St. Johns, Newfoundland. 



The specimen described is in the British Museum. 



4. E. natata ! 



Palingenia natata Walk.! Catal. 551, 13. 9 Subimago. 



Fusco-testaceous ; antennce black ; abdomen interruptedly bi- 

 vittated with fuscous ; setae pilose, fulvous, banded with fuscous, 

 a little shorter than the body ; feet testaceous, tibiae and tarsi fus- 

 cous; wings subcinereous, veins black and black-banded, excepf 

 at the apex and posterior margin ; the anterior ones with three or 

 four discoidal fuscous spots. 



Length of body 15 millim. Alar expanse 38 millim. Setae 15 

 millim. 



Hah. St. Martin's Falls, Albany River, Hudson's Bay (Barn- 

 ston) ; Chicago (Osten Sacken). 



5. E. pudica! 



Ephemera ? pudica Hagen ! J Subimago. 



Luteous ; thorax spotted with fuscous ; abdomen with the pos- 

 terior margin, exteriorly, of the middle dorsal segments black; feet 

 luteous, the knees and a ring upon the middle of the femora fus- 

 cous ; wings grayish-hyaline, longitudinal veins yellow, transverse 

 ones fuscous, banded with gray ; transverse discoidal veins a little 

 irregular. 



