ASTACID^E. 101 



17. Florida. — Two species: C.fallax and C. Lecontei. 



The only locality given is Pensacola, on the northwestern border, near 

 Alabama. Our knowledge of Florida also is very scanty. Lewis li. 

 Gribbes quotes C. affinis from Florida, but bis determinations are not at 

 all trustworthy. 



18. Alabama. — Five species: C. acid us, C. Lecontei, C. venutus, C. 

 immanis, C. advena. 



C. immums lives in Huntsville, on the northern border ; all the other 

 species occur at Mobile, in the southwestern limits of the State. Nearly 

 the whole State remains unexplored. 



19. Mississippi. — Four species: C. aeidus, C. obesus, C. Lecontei, 

 C. huirifrr. The first from the Mobile River, Kemper County, the mid- 

 dle of the eastern border of the State; C. obesus from Monticello ; the 

 two others from Root Pond, a locality unknown to me. 



20. Louisiana. — Three species : C. acufus, C. ClarM, C. obesus. 



The species are from the southeastern border from New Orleans, one 

 also from the northeastern border, from Milliken's Bend; all from the 

 Mississippi. Nearly the whole State remains to be explored. 



21. Tennessee. — One species: G. placidus, from Lebanon, nearly in 

 the middle of the State. 



22. Kentucky. — Three species : C.pellucidus, C. juvenilis, C.Bartomi. 

 Besides the celebrated species from the Mammoth Cave, C. pellucidus, 



the others are from Little Hickman and Hickman's Landing, near the 

 Kentucky River, in the middle of the State. 



23. Indiana. — Two species: C. acutus, C. propinquus. 



Only one of the ninety-two counties gives a species; this is from 

 Delphi, on the Wabash River, in the middle of the State. 



24. Ohio. — Four species: C. virilis, C. rustims, C. Bartonii, C. obesus. 



Only in the southwestern part of the State, from Cincinnati and Co- 

 lumbia, and a little farther, from Dayton, Miami River. Montgomery 

 County, are species noticed. C. obesus is from Kellev Island, Lake 

 Erie. We know of species from only two of the eighty-eight counties. 



25. MICHIGAN. — None. I am told that fresh-water crabs occur in 

 Lake St. Clair; species are also noticed from Lake Superior. 



26. Wisconsin. — C. virilis, from the Sugar River. I am told that 

 fresh-water crabs are found near Milwaukee. 



27. Minnesota. — None. Professor Agassiz has found a species of 

 Co mhii rus at Minnehaha Falls, above St. Paul. I have not seen the 

 specimen. 



28. Iowa. — One species : C. virilis is found in the Mississippi at 

 Davenport and Burlington, along the southeastern border. The State 

 is unexplored. 



29. Illinois. — Seven species: C. acutus var. A., C. troglodytes, C. 

 virilis. C. placidus, C. propinquus, V. imiuunis, C. obesus. 



