OF WASHINGTON. 205 



Perla fumosa Banks. 



One pair, Washington, in July at light. 

 Perla xanthenes Newman. 



Washington, at light, 4th July. 

 Perla postica Walker. 



Falls Church, Va., several specimens collected on the 29th of 

 April. 

 Perla americana Banks. 



Falls Church, Va., several specimens collected in June ; also 

 taken at Plummer's Island, Md., in May. 

 Perla annulipes Hagen. 



Described from Washington, but I have not taken it here. 

 Perla tristis Hagen. 



Recorded from Washington by Hagen ; I have not seen it 

 from here. 

 Pseudoperla occipitalis Pictet. 



Very common. I have taken it at light, and by sweeping the 

 vegetation near streams, in June and July. 

 Perlinella placida Hagen. 



Very commonly taken by sweeping and at light, from June 

 until August. 

 Chloroperla transmarina Newman. 



Two from Plummer's Island, Md., 22d April (Currie). 

 Isopteryx cydippe Newman. 



Commonly collected in June and July by sweeping near 

 streams. 

 Capnia pygmaea Burmeister. 



Common along the Potomac river in February and March. 

 Capnia necydaloides Pictet. 



Found with the preceding species. 

 Tseniopteryx fasciata Burmeister. 



Along the Potomac from February to April. 

 Tseniopteryx frigida Hagen. 



Several specimens from Plummer's Island, Md., 24th Febru 

 ary (Currie). 

 Tseniopteryx maura Pictet. 



Recorded by Hagen, but not seen here by the writer.. 

 Nemoura venosa Banks. 



A few specimens at light, Washington, D. C., and Falls 

 Church, Va., in June. 



