EPHEMERIWE. 565 



30. Baetis vicabia, Mas. 



Ferruginea ; antenna nigra ; thoracis latera flavo notata ; abdo- 

 men fusco fasciatum ; seta testaccce, subannulatce, corpore 

 plus duplo longiores ; pedes lestacei, femoribus nigro bifasci- 

 atis ; alee hgaliiue, antica? venis costalibus et discalibus fusco 

 nebulosis. 



Male. — Ferruginous : antenuce black : thorax with pale yellow 

 marks on each side: abdomen hardly twice the length of the tho- 

 rax ; a brown band on each segment : setse dull testaceous, darker 

 on the sutures of the joints, more than twice the length of the body : 

 legs testaceous, slender ; a broad brown band on the middle, and a 

 narrower one on the tip of each femur: fore-legs longer and darker: 

 wings hyaline ; veins of the fore-wings brown, indistinctly clouded 

 along the fore border, and in the disk : fore border pale brown for 

 one- third of the length from the tip. Length of the body 6 lines ; 

 of the setee 15 lines; of the wings 15 lines. 



a. North America? Presented by the Entomological Club. 



31. Baetis basalis, Mas. 



Nigro-picea, long a, gracilis ; abdomen testaceo fasciatum ; setce 

 albida?, nigro annulate, corpore fere duplo longiores ; ala 

 anticce limpida, venis costalibus fusco nebulosis, posticcr fusca; 

 apice limpida>. 



Pitchy black, long, slender: abdomen with dull testaceous 

 bands on the sutures of the segments, more than twice the length of 

 the thorax: tentacula whitish : setas whitish with blackish hands 

 on the sutures of the joints, nearly twice the length of the body : 

 fore-wings limpid ; veins brown, clouded along the fore border with 

 black, which forms a spot about the middle of the costa: hind- 

 wings brown, limpid towards the tips. Length of the body 6 lines ; 

 of the setee 11 lines; of the wings 14 lines. 



a. Lake Winipeg. Presented by Sir John Richardson. 



3 c 3 



