568 EPHEMERIN/E. 



Male. Piceous, testaceous beneath: head yellow about the 

 eyes: antennae black : thorax with a yellow stripe which has a lu- 

 teous tinge on the metathorax: abdomen hardly twice the length of 

 the thorax, with a broad yellow stripe which contains some piceous 

 marks : legs testaceous ; a broad ferruginous band on each femur ; 

 tarsi ferruginous towards the tips : fore-legs long : wings quite lim- 

 pid : veins black ; transverse veins very numerous and strongly 

 marked : fore border of the fore-wings dark brown, with a yellow 

 streak in the front towards the base. Length of the body 5 lines ; 

 of the wings 1 1 lines. 



a. Java. From Mr. Argent's collection. 



37. BAETIS INVARIA, Mas. 



Ferruginea, subtus fulva ; antennae nigrce, basi ferruginece ; pedes 

 testacei, antici longi ; alee limpidce, venis testaceis transversis 

 albidis. 



Male. Pale ferruginous, tawny beneath : antennae black, fer- 

 ruginous at the base: abdomen hardly twice the length of the 

 thorax : legs testaceous ; fore-legs long : wings limpid ; veins pale 

 testaceous, indistinct; transverse veins whitish, very indistinct. 

 Length of the body 2^ 3 lines ; of the wings 7 9 lines. 



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

 by Dr. Barnston. 



38. BAETIS ruse A. 



Picea, subtus ferruginea ; abdomen ferrugineum, subtus fulvum ; 

 seta testacece, fusco subannulatce, corpore plus duplo longiores; 

 pedes testacei, antici fusci ; alee hyalince, venis testaceis, anticce 

 costa apicali fusca. 



Piceous, ferruginous beneath : antennae black : abdomen ferru- 

 ginous, tawny benealh, hardly twice the length of the thorax : seta? 

 dull testaceous, more than twice the length of the body, with pale 

 brownish bands on tbe sutures of the joints: legs testaceous; fore- 

 legs brown : wings hyaline ; veins testaceous ; fore border of the 

 fore-wings pale brown for one-third of the length from the tip. 



