G50 PROCEEDINGS OE THE NATIONAL MUSEUM. 



defined and spiniform, as in specimens from Cumberland Gap. 1 G. b. 

 longirostris has been previously known from Blountsville and Cumber- 

 land Gap, Tennessee, and the Clinch Eiver, West Virginia. 



CAMBARUS LONGULUS Girard. 



Cumberland Gap, Tazewell, Greeneville, and Knoxville, Tennessee 

 (Coll. U.S.N.M.). 



CAMBARUS LATIMANUS (Le Conte). 



Atalla, Etowah County, Alabama (Coll. U.S.N.M.). One male, Form 

 II, three females. The sides of the rostrum are more nearly parallel 

 than in Le Conte's types of G. latimanus. 



CAMBARUS DIOGENES Girard. 



Columbus and Lockbourne, Franklin County, Ohio (Coll. Mus. Comp. 

 Zool.). Minnesota River at Fort Snelling, Minnesota (Coll. U.S.N.M.). 

 Spring Creek at Delhi, Delaware County, Iowa; Belmond, Wright 

 County, Iowa; Paragould, Greene County, Arkansas; Fayetteville, 

 Washington County, Arkansas (Coll. S. E. Meek). 



The specimen (male, Form II) from Belmond, Iowa, differs from the 

 typical G. diogenes in having a long rostrum, with a narrower, more 

 tapering acumen. 



Mr. W. P. Hay has recorded this species from the following new 

 localities in Indiana: Irvington, Marion County; Greencastle, Putnam 

 County; North Salem, Hendricks Couuty. 



CAMBARUS ARGILLICOLA Faxon. 



Bay Saint Louis, Hancock County, Mississippi; Brazoria and Vic- 

 toria, Texas (Coll. U.S.N'.M.). Irvington, Bloomington, and Wheatland, 

 Indiana (teste W. P. Hay). According to Mr. Hay, G. argillicola, like 

 G. diogenes, builds mud "chimneys" over its burrows. 



CAMBARUS EXTRANEUS Hagen. 



Five specimens from the Big Cahawba Eiver, Alabama (Coll. U.S.N.M.), 

 combine characters belonging to G. extraneus and to G. girardianus in 

 such a way as to render it necessary to reduce the latter form to the 

 rank of a subspecies. In these intermediate specimens, the areola is 

 long as in G. girardianus; there are two spines on the upper border of 

 the merus as in G. extraneus, while the posterior wall of the orbit has 

 an outline midway between these two forms. 



CAMBARUS EXTRANEUS GIRARDIANUS Faxon. 

 Cambarus girardianus Faxon, Proc. Amer. Acad. Arts and Sci., XX, p. 117, 1884. 

 Two males of the second form from Eastanaula Creek, near Athens, 

 Tennessee (Coll. U.S.N.M.). 



1 Rev. AstacidiK, p. 64. 



