126 XJ. S. NATIONAL MUSEUM BULLETIN 212 



Range : Known in North America from Newfoundland, Nova Scotia, and 

 eastern United States. 



Genus TIVIULUS Chamberlin 



Tiviulus Chamberlin, 1941, Bull. Univ. Utah, biol. ser., vol. 6, No. 4, p. 17. 

 Generotype: Tiviulus expressus Chamberlin, by original designation. 

 Range: Washington. 

 Species: One. 



Tiviulus expressus Chamberlin 



Tiviulus expressus Chamberlin, 1941, Bull. Univ. Utah, biol. ser., vol. 6, 



No. 4, p. 17, figs. 27, 28. 

 Type: Collection of R. V. Chamberlin. 



Type Locauty: Arlington, Snohomish County, Washington. 

 Range : Known only from type locality. 



Family PAEROMOPIDAE Cook 



Paeromopidae Cook, 1895, Ann. New York Acad. Sci., vol. 9, p. 6. — 



Chamberlin, 1949, Chicago Acad. Sci. Nat. Hist. Misc. No. 52, p. 1. 

 Calif orniulidae Verhoeff, 1938, Zool. Anz., vol. 122, Nos. 5-6, p. 114. 



Genus AICON Chamberlin 



Aigon Chamberlin, 1949, Chicago Acad. Sci. Nat. Hist. Misc. No. 52, p. 1. 

 Generotype: Aigon rodocki Chamberlin, by original designation. 

 Range : Idaho, Montana. 

 Species: Two. 



Aigon parvior (Chamberlin) 



Klansolus parvior Chamberlin, 1940, Pomona Coll. Journ. Ent. and Zool., 



vol. 32, No. 4, p. 83. 

 Aigon parvior Chamberlin, 1949, Chicago Acad. Sci. Nat. Hist. Misc. 



No. 52, p. 1. 

 Type : Collection of R. V. Chamberlin. 

 Type Locality : Flathead Lake, Lake County, Montana. 

 Range: Known only from type locality. 



Aigon rodocki Chamberlin 



Aigon rodocki Chamberlin, 1949, Chicago Acad. Sci. Nat. Hist. Misc. 



No. 52, p. 2, figs. 1, 2. 

 Type : Collection of R. V. Chamberlin. 

 Type Locality : Sweetwater, Nez Perce County, Idaho. 

 Range: Known only from type locality. 



