537 



Piceous : abdomen more than twice the length of the thorax : 

 setae pale piceous, pubescent, longer than the body : legs dull 

 tawny ; fore-legs darker : wings grayish ; veins black, clouded ex- 

 cept towards the tips and along the hind border with brown, which 

 forms in the disk a spot at one-third of the length, another at two- 

 thirds of the length, and an interrupted band between them. 

 Length of the body 5 lines ; of the setae 6 lines ; of the wings 14 

 lines. 



a. River St. Lawrence. Presented by the Entomological Club. 



6. EPHEMERA COLOMBLE. 



Fulva ; antenna fuscce ; thorax testaceo notatus ; abdomen luteum, 

 nigro fas datum et bivittatum; setae fuscce, corpore duplo Ion- 

 giores ; pedesfulvi; alee albidce, venis testaceis. 



Subimago. Tawny : antennae brown : thorax with some tes- 

 taceous marks: abdomen luteous, about twice the length of the 

 thorax, with two black stripes, and with a black band on the hind 

 border of each segment: setae brown, about twice the length of the 

 body : legs tawny : wings whitish ; veins testaceous. Length of 

 the body 4 lines ; of the seta? 9 lines ; of the wings 16 lines. 



a. Columbia. From Dr. Cuming's collection. 



7. EPHEMERA DECOBA. 



Picea; antennce nigrce, basi fulvce ; abdomen ferrugineo varium ; 

 setce testacece, fusco fasciatce, corpore multo longiores ; pedes 

 testacei, antici picei ; alee hyalince, fusco maculatce et apud 



Piceous: antennae black, tawny at the base: abdomen rather 

 more than twice the length of the thorax, partly ferruginous on the 

 disk and about the borders of the segments : seta3 testaceous with 

 brown bands on the sutures of the joints, much longer than the 

 body : legs pale testaceous ; fore-legs piceous : wings hyaline ; veins 

 black, and with the exception of those at the tips and along the 

 hind border deeply clouded with brown which forms a few spots in 

 each disk. Length of the body 5| lines; of the setae 12? lines; of 

 the wings 13 lines. 



a. Canada. Presented by Dr. Barnston. 



3 A 



