MORMONIA — DASYSTOMA. 213 



2. S. griseus ! 



Silo griseus Hagen ! 



Brownish-gray, with fuscous hair; antennae brownish-gray, the 

 apex subannulated with lurid ; head, and thorax above, rufescent; 

 feet pale, the posterior ones and the spurs fuscous ; anterior wings 

 narrow, brownish-gray, hairy, with long cilia; posterior wings 

 cinereous. Male. 



Length to tip of wings 6 millira. Alar expanse 11 millini. 



Hab. Trenton Falls (Osteu Sacken). 



MORMONIA Stephens. 



Spurs arranged 2, 4, 4; antennas with the basal joint long, 

 thick, very hirsute. 



1. M. togata! 



Mormonia togata Hagen ! 



Brownish-gray; with luteous hair; antennae pilose, pale yellow, 

 annulated with fuscous, the basal article long, brownish-gray, 

 hairy; palpi and feet pale; abdomen fuscous; anterior wings nar- 

 row, fuscous, with luteous hair, veins fuscous, with fuscous pile; 

 posterior wings cinereous. Female. 



Length to tip of wings 9 millim. Alar expanse 16 millim. 



Hab. Washington; St. Lawrence River, Canada (Osten Sacken). 



DASYSTOMA Rambur. 

 Spurs arranged 2, 2, 2. 



1. D. numerosum. 



Phryganea numerosa Say, Western Quart. Rep. 1823, II, p. IGO, 2. 



Black, with cinereous hair; antennae as long as the body, pale 

 fuscous, the basal article black, hairy; palpi pale fuscous; head 

 short, black, densely covered with cinereous hair; thorax black, 

 with cinereous hair ; feet pale fuscous ; abdomen black, the apices 

 of the segments pale rufous, lateral line rufous ; wings whitish- 

 brown, immaculate, veins fuscous. (From the description of 

 Say.) 



Length to tip of wings 12 millim. Alar expanse 23 millim. 

 18 



