274 NEUROPTERA OF NORTH AMERICA. 



" This species appears in vast numbers early in May, from the 

 "7th to the 9th of that month, on the Ohio River. Having a 

 " white appearance when flying, they might be compared to flakes 

 " of snow in a moderate fall of that meteor." (Say.) 



May it not belong to Brachycentrus? Can it be B. fuh'ginosus? 



2. D. laterale. 



Phryganea lateralis Say, Western Quart. Rep. 1823, II, p. 161, 3. 



Black, above with cinereous hair, beneath with plumbeous hair; 

 antennae and mouth pale ; feet whitish ; abdomen black, with a 

 lateral pale stripe, and the apices of the segments pale ; appendages 

 white ; wings whitish, the anterior ones spotted with fuscous, a 

 common spot on the middle of the inner margin, and several near 

 the tip somewhat arranged into a band, the costal one of which is 

 larger ; posterior wings white, immaculate. (From the descrip- 

 tion of Say.) 



Length to tip of wings 10 millim. Alar expanse 18 millim. 

 Hab. " Shippingsport, Kentucky, Ohio River; they appeared 

 " in very great numbers at the banks of the Ohio on the 21st of 

 " May; judging from the small space of about half a mile on the 

 " Indiana side of the river, where I had the opportunity to see 

 " them, their number could have been but little inferior to that of 

 " P. numerosa, which occurred a few days before, but of which a 

 " specimen was now rarely to be seen." (Say.) 

 May it not belong to Brachycentrust 



HYDROPTILA DALUIAS. 

 Spurs of the male arranged 0, 3, 4 ; female 0, 2, 4. 



1. H. tenebrosa. 



Hydroptila tenebrosa Walk. Catal. 134, 11. 



Blackish ; antennae fuscous, the basal article larger, ovate ; feet 

 testaceous; wings blackish-gray, ciliated, with black veins. (From 

 the description of Walker.) 



Length to tip of wings 4 millim. Alar expanse 6 millim. 



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

 ston). 



