202 ENTOMOLOGICAL SOCIETY 



Suborder CORRODENTIA. 

 Family PSOCIDyE. 

 Psocus virginianus Banks. 



Inhabits the crevices of old fence-rails. Falls Church, Va., 

 from July to September. 



Psocus sparsus Hagen. 



From Falls Church, Va., and Plummer's Island, Md., July to 

 October. 



Psocus lugens Hagen. 



From Falls Church and Glencarlyn, Va., in August. 

 Psocus mcestus Hagen. 



Several from Falls Church, Va., in June. 

 Psocus atratus Aaron. . 



Several from trunk of tulip tree, Falls Church, Va., in July. 

 Psocus trifasciatus Provancher. 



P. speciosus Aaron. 



One from Falls Church, Va., in September. 

 Psocus hageni, n. n. 



P. contaminatus Hagen, 1861 (not Stephens, 1836). 



Rather common on tree-trunks, from July to September. 

 Psocus striatus Hagen. 



On old fences and old rails, often with P. purus. Falls 

 Church, Va., from July to September. 

 Psocus purus Walsh. 



On old fences and old rails. Falls Church, Va., in Septem 

 ber. 

 Psocus leidyi Aaron. 



On trunks of living trees ; also on lichens on rocks, Falls 

 Church, Va., and Washington, from July to September. One 

 of our most common species. 

 Psocus variabilis Aaron. 



Very common on maple-tree trunks, Washington, D. C., and 

 Falls Church, Va., in July and August. 

 Psocus pollutus Walsh. 



Two from Falls Church, Va., in October. 

 Psocus perplexus Walsh. 



* One specimen, probably this species, from Falls Church, Va., 

 25th June. 



