EPHEMEKIN.E. 569 



Length of the body 4 lines ; of the setae 12 lines ; of the wings 9 

 lines. 



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



by Dr. Barnston. 

 c. Nova Scotia. From Lieut. Redman's collection. 



39. Baetis debilis. 



Ferruginea ; seta testacea?, cor pore longiores ; pedes testacei ; alee 

 sublimpidce, venis testaceis. 



Fern. — Ferruginous : abdomen darker than the thorax and 

 twice its length ; setae testaceous, longer than the body : legs pale 

 testaceous: wings nearly limpid; veins pale testaceous, distinct. 

 Length of the body 3 lines ; of the setae 4 lines ; of the wings 8£ 

 lines. 



a. Nova Scotia. From Lieut. Redman's collection. 



40. Baetis Canadensis. 



Testacea ; capitis vertex thoracisque discus ferruginei ; abdomen 

 piceo fasciatum ; pedes pallidi; femorum fasciis tarsisque 

 nigricantibus ; alee limpidce, costa apicali fusca. Var. ? 

 Flava ; caput supra piceum ; thorax antice piceo bivittatus, 

 apud discum ferrugineus ; abdomen ferrugineo fasciatum ; 

 setce fusco subayimdatce, corpore paullo plus duplo longiores ; 

 femora fasciis duabus nigricantibus ; ala anticoe costa apicali 

 sub flava. 



Mule. — Pale testaceous : head ferruginous above: disk of the 

 thorax ferruginous : abdomen rather less than twice the length of 

 the thorax ; borders of the segments piceous : legs pale testaceous ; 

 bands of the femora and tarsi blackish : wings limpid ; veins black, 

 very distinct : fore border of the fore-wings brown along one-third 

 of the length from the tip. Length of the body 3 lines ; of the 

 wings 8 lines. 



a, Canada. Presented by Dr. Barnston. 



