48 NEUROPTERA OP NORTH AMERICA. 



11. B. invarla. 



Baetis invaria Walk. Catal. 568, 37. 



J* Imago. Pale ferruginous, beneath fulvous; antennae black, 

 at base ferruginous ; feet testaceous ; wings hyaline, transverse 

 veins pale- whitish. (From Mr. Walker's description.) 



Length of body 5 — 6 raillim. Alar expanse 14 — 18 mniim. 



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

 ston). Perhaps the male of the preceding species? 



12. B. annulata. 



Baetis annulata Walk. Catal. 567, 34. 



J* Imago. Ferruginous, beneath testaceous ; antenn® fus- 

 cous, base ferruginous ; thorax with two testaceous stripes ; ab- 

 dominal segments with a testaceous, triangular spot each side ; 

 setiE whitish, the incisures black; feet whitish, banded with black; 

 wings hyaline, veins black. (From Mr. Walker's description ) 



Length of body 10 millim. Alar expanse 26 millim. 



Ifab. Trenton Falls, New York. 



The mutilated specimens from Trenton Falls, cited under B. 

 canadensis, may belong here, only they are of smaller size. 



13. B, vicaria! 



Baetis vicaria Walk. Catal. 565, 30. 



Imago. Ferruginous ; antennas black ; sides of the thorax 

 marked with yellow ; segments of the abdomen banded with fus- 

 cous ; setae pale testaceous, subannulated, more than twice the 

 length of the body ; feet testaceous, femora with two black bands, 

 anterior feet obscurer, wings hyaline, anterior ones with the costal 

 and discoidal veins brownish-black, costal margin at the apex 

 dusky, obscurer farther in. Imago and subimago, male and female. 



Length of body 12 millim. Alar expanse 30 millim. Setoe 20 

 —30 millim. 



Hab. St. Lawrence River ; Chicago ; Washington ; Savannah 

 (Osten Sacken). Is it distinct from B. canadensis? 



14. B. femorata. 



Baetis femorata Say, Godman's West. Quart. Rep. II, 162, 1. 



J*. Fuscous, abdomen beneath whitish, setae double the length 

 of the body; femora with a middle and apical reddish-brown band ; 



