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., 
Noxeoto; (Zico i. 1. 1 9). 
Type locality: — Lawn Ridge, Ill. Types, M. C. Z., No. 188; paratypes, 
M. C. Z., No. 3,355 (Belleville, Saint Clair Co., Ill.); Mus. Hist. Nat. Paris 
(Lawn Ridge, Ill., 1 @). 
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 
(iL Gil tic Le) )e 
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, Proce. U. 8. 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. 4,861, 4,362, (Goodland, and 
Kiamichi, Indian Terr. [mow Oklahoma]); U. 8. 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. 
