46 NEUROPTERA OF NORTH AMERICA. 



5. B. debilis. 



Baetis debilis Walker, Catal. 569, 39. 



Ferruginous; abdomen obscurer; setae testaceous, much longer 

 than the body ; feet pale testaceous ; wings subhyaline, veins tes- 

 taceous. 9. (From the description of Mr. Walker.) 



Length of body 6 millim. Alar expanse IT. Length of setae 

 8 millim. 



Hob. Nova Scotia (Redman). 



6. B. arida. 



Baetis arida Say, Jour. Acad. Philad. VIII, 42, 2. Walk. Catal. 562, 24. 



Reddish-brown ; head whitish, varied with ferruginous, vertex 

 each side, with a small black point ; eyes rufous, with a whitish 

 vitta; incisures of the abdomen much obscurer; setae and poste- 

 rior feet greenish-white; wings immaculate. (From the description 

 of Say.) 



Length of body 10 millim. 



Hob. Indiana (Say). A female imago, from "Washington, may 

 belong here ; the specimen is mutilated. 



7. B. verticis! 



Baetis verticis Say, Jour. Acad. Philad. VIII, 42, 3. Walk. Catal. 562, 25. 



Yellowish-white ; vertex ferruginous ; thorax with two ferru- 

 ginous vittas, which are confluent anteriorly, but obsolete poste- 

 riorly; setae a little longer than the body, the incisures black; feet 

 whitish, anterior femora at the apex ferruginous, apex of the 

 anterior tibia9 and incisures of the tarsi fuscous ; wings hyaline, 

 veins exclusive of the marginal ones, black. (From the description 

 of Say.) g Imago. 



Length of body 8 millim. Alar expanse 21 millim. Setae 24 

 millim. 



Hob. Indiana (Say) ; Maryland (TJhler). 



Two specimens from Maryland agree with the description, ex- 

 cept in the color of the veins of the wings; the marginal ones are 

 black, or rather fuscous. Is the description good ? It should be 

 observed that the species of Baetis are very difficult to separate, 

 and perhaps some species heretofore described may be only syno- 

 nyms of others. A further acquaintance is necessary. A male and 

 female from Dalton, Georgia (Osten Sacken), and Washington (id.) 



