OF WASIIINdTOft. 213 



Specimens from Washington, D. C. , and Falls Church, Va., 

 at lights. 



Readily known by small size and uniformly yellow wings. 

 Leptocella exquisita Walker. 



Common from June to August. This species is variable in size. 

 Leptocella uwarowii Kolenati. 



Not as common as the preceding. 

 Leptocella albida Walker. 



Less common than others, July. 

 Trisenodes ignita Walker. 



Very abundant all summer. 

 CEcetina avara Banks. 



Quite common along the Potomac river, in June and Sep 

 tember. 

 GEcetina parvula Banks. 



Moderately common, at light, Washington, D. C., and Falls 

 Church, Va., July. 

 CEcetina guttata Banks. 



Three specimens from Plummer's Island, Md., July ; three 

 in National collection, 4th and lyth July, and 25th August. 

 CEcetina incerta Walker. 



Very abundant, June to September. 

 CEcetina fumosa Banks. 



Quite common, June to August, Washington, D. C., High 

 Island and Plummer's Island, Md. 

 CEcetina pavida Hagen. 



Several specimens from Plummer's Island, Md., August. 

 CEcetina flaveolata Hagen. 



A few from Falls Church, Va., at light, July and August. 

 Described from Washington. 



Family HYDROPSY 

 Macronema zebratum Hagen. 



Common along the Potomac, in July and August. 

 Macronema transversa^Walker. 



From Cabin John Bridge, Md., 3oth May. 

 Polycentropus robusta Walker. 



Washington, D. C., at light, June and July. 

 Polycentropus confusus Hagen. 



Along the Potomac river, May to September. 



