CRAYFISHES. 421 



54. Cambarus immunis. 



Cambarus immunis Hagen, Mem. M. C. Z., 1870, 2, p. 71. 



Cambarus signifer Herrick, 10th Ann. Rept. Geol. Surv. Minn., 1882, p. 253. 

 Type locality: — Grass Lake, Richfield, Hennepin Co., Minn. Cotype, M. C. Z., 

 No. 3,515, (2 d^ f. I., 1 9). 



Type locality: — Lawn Ridge, 111. Types, M. C. Z., No. 188; paratypes, 

 M. C. Z., No. 3,355 (Belleville, Saint Clair Co., 111.); Mus. Hist. Nat. Paris 

 (Lawn Ridge, 111., Id'). 



54a. Cambarus immunis spinirostris. 



Cambarus immunis spinirostris Faxon, Proc. Amer. Acad., 1884, 20, p. 146. 



Type locality: — Creek running into the east side of Redfoot Lake, near 

 Idlewild Hotel, Obion Co., Tennessee. Cotypes, U. S. N. M., No. 4,655; M. C. Z., 

 No. 3,562. 



55. Cambarus validus. 



Cambarus validus Faxon, supra, p. 382. 



Type locality: — Huntsville, Madison Co., Ala. Type, M. C. Z., No. 301 



(1 cf f. I.). 



56. Cambarus palmeri. 



Cambarus palmeri Faxon, Proc. Acad., 1884, 20, p. 124. 



Type locality: — Creek running into the east side of Redfoot Lake, near 

 Idlewild Hotel, Obion Co., Tenn. Cotypes, U. S. N. M., No. 4,872; M. C. Z., 

 No. 3,564. 



56a. Cambarus palmeri longimanus. 



Cambarus palmeri longimanus Faxon, Proc. LT. S. Nat. Mus., Feb. 17, 1898, 

 20, p. 655. 



Type locality: — Red River, Arthur City, Lamar Co., Texas. Types, 

 M. C. Z., No. 7,390; paratypes, M. C. Z., No. 4,361, 4,362, (Goodland, and 

 Kiamichi, Indian Terr, [now Oklahoma]) ; U. S. N. M., No. 19,684 (Arthur, 

 Tex., Indian Terr.); Mus. Zool. Torino. 



57. Cambarus difficilis. 



Cambarus difficilis Faxon, Proc. U. S. Nat. Mus., Feb. 17, 1898, 20, p. 656. 



Type locality: — Creek tributary to a southern branch of the Canadian 

 River, McAlester, Pittsburg Co., Oklahoma. Types, M. C. Z., No. 4,359; 

 paratypes, U. S. N. M., No. 19,687; Mus. Zool. Torino. 



