BAETIS. 47 



are possessed by me, perhaps the true B. verticis: is it not B.fla- 

 veola Pick? 



8. B. canadensis ! 



Baetis canadensis Walk. Catal. 569, 40. 



Testaceous ; vertex and disk of the thorax ferruginous ; abdo- 

 men with the margins of the segments piceous ; feet pale, femora 

 fuscous, incisures of the tarsi black ; wings hyaline, costal margin 

 at the apex fuscous, veins black. (From Mr. Walker's description.) 



Length of body 6 millim. Alar expanse 16 millim. 



Hob. Canada (Barnston); Trenton Falls (Osten Sacken). 



I have seen mutilated male and female imagines from Trenton 

 Falls; are they the true B. canadensis Walker? A larger female, 

 expanding 30 millimetres, is pale yellow, wings hyaline, veins yel- 

 low; the head and abdomen are wanting. In London I noted 

 nothing about Mr. Walker's species, except that it was " allied to 

 B.flaveola;" the variety there described is perhaps a female. 



9. B. ignava. 



Baetis ignava Hagen. Baetis'? subimago, Walk. Catal. 571, 45. 



Rufous; eyes broad, very prominent ; thorax rufous ; abdomen 

 pale, reddish-gray; setae thick; feet rufous; wings gray, opaque, 

 the anterior ones narrow at base, veins bordered with fuscous. 



Alar expanse about 25 millim. 



Hob. Newfoundland. 



Certainly a female subimago : the species is very doubtful ; 

 Walker assigns Madrid as the locality. I found the typical speci- 

 men labelled Newfoundland. 



10. B. fuscata. 



Baetis fuscata Walk. Catal. 570, 41. 



9 Imago. Piceous, beneath ferruginous ; antennae black ; 

 sides of the thorax spotted with yellow ; feet ferruginous, ante- 

 rior ones piceous ; wings hyaline, veins pale. 



9 Subimago. Obscure testaceous, setae much paler, longer 

 than the body; wings gray, opaque. (From Mr. Walker's descrip- 

 tion.) 



Length of body 4 — 5 millim. Alar expanse 12 — 16 millim. 



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

 ston.) 



