204 ENTOMOLOGICAL SOCIETY 



Peripsocus madidus Hagen. 



On the ground, among dead leaves, etc., at Falls Church, Va., 

 and on rocks at Glencarlyn, Va., September and October. 

 Peripsocus permadidus Walsh. 



A few only, found with the preceding. 

 Ptilopsocus annulicornis Banks. 



One specimen on chestnut bark, 8th June, Falls Church, Va. 

 Elipsocus canadensis Provancher. 



One specimen from Falls Church, Va., i6th July. 

 Csecilius aurantiacus Hagen. 



Common on the leaves of various trees from July to September. 

 Caecilius pinicola Banks. 



Falls Church and Glencarlyn, Va.. July to September. This 

 species lives in pine trees. 

 Csecilius rufus Walsh. 



Falls Church, Va., in dead leaves, September and October. 

 Pterodela pedicularia Liang. 



Abundant on fresh wood, in old furniture, about houses, on 

 wood piles, etc., from July to October. 

 Amphientomum hageni Packard. 



On bark of living and dead trees, old rails, etc., Falls Church, 

 Va., and Washington, D. C., from July to October. 

 Troctes divinatoria Fabricius. 



About houses, common everywhere. 

 Troctes bicolor Banks. 



Running over dry boards, Falls Church, Va., in June. 

 Troctes niger Banks* 



Beneath dead and decaying logs in woods at Falls Church, Va., 

 in June. 

 Dorypteryx pallida Aaron. 



Found about old books and desks, from May to October. This 

 is our only jumping species. 



Suborder PLECOPTERA. 

 Family PERLID^E. 

 Pteronarcys regalis Newman. 



One male', 2d May, Falls Church, Va. ; another from Plum- 

 mer's Island, Md. , 2oth April. 

 Acroneuria arenosa Pictet. 

 A. arida Hagen. 



One of our most common species, found in June and July. 



