564 ephemerinjE. 



legs whitish, rather stout ; a pale brownish band on the middle and 

 another at the tip of each femur: fore-legs long: wings limpid ; 

 veins tawny: fore border of the fore-wing with a slight tawny tinge 

 towards the tip. Length of the body 4 lines ; of the setae 12 lines ; 

 of the wings 12 lines. 



a. St. Martin's Falls, Albany River, Hudson's Bay. Presented by 

 Dr. Barnston. 



Ferruginea, testaceo varia ; abdominis discum piceum ; seta fuscoe, 

 testaceo annulata, corpore plus duplo longiores ; pedes testacei, 

 antici picei ; alee limpida, anticce ad costam fuscce, postica 

 fusco submarginata. 



Male. — Ferruginous, partly testaceous beneath : disk of the 

 head tawny in front: mesolhorax and metathorax testaceous: ab- 

 domen less than twice the length of the thorax ; disk above piceous : 

 seta? brown with distinct testaceous bands, more than twice the 

 length of the body: legs testaceous: lore-legs piceous: wings 

 limpid; veins black; transverse veins numerous and strongly 

 marked : fore border of the fore-wings brown : hind-wings slightly 

 tinged with brown along the hind border. Length of the body 9 

 lines; of the setae 23 lines; of the wings 20 lines. 



a. Canada. Presented by Dr. Barnston. 



29. Baetis rem ota. 



Picea, ferrugineo varia; seta testacecs, corpore multo longiores; 

 pedes testacei, antici picei longissimi ; ala limpida, anticce 

 longa, costa basi lurida apice fusca. 



Piceous, partly ferruginous on each side and beneath : seta? 

 dull testaceous, much longer than the body : legs testaceous, slen- 

 der : fore-legs piceous, very long : wings limpid ; veins black : 

 fore-wings long, with an indistinct tinge on the fore border, which 

 is lurid at the base and brown towards the tip. Length of the 

 wings 16 lines. 



a. New Zealand, Presented by Dr. Sinclair. 



