OF ARTS AND SCIENCES. 139 



fourth pairs of legs in the male. The female specimen in the 

 Acad. Nat. Sci. Phila. (No. 170, Mr. Pease), fully described by 

 Ilagen, is probably correctly referred to this species by him, 

 although in the absence of male specimens there is some uncer- 

 tainty. I have seen but one specimen of C. Mexicanus, a male. 

 In this the chelae are more cylindrical, and are covered with 

 smaller, more closely set, granular- tubercles. In the collection 

 of Acad. Nat. Sci. Phila., I find another alcoholic female from 

 Jalapa, Mexico, which agrees well with Mr. Pease's specimen. 

 A mutilated female in the U. S. Nat. Mus. (No. 3288), collected 

 by Sumichrast at the Isthmus of Tehuantepec, seems also to 

 belong here. 

 15. Cambarus pellucidus. 



Astacus pellucidus, Tellkampf, Arch, Anat. Physiol, u. wis- 

 sensch. Med., 1844, p. 383. 



Astacus ( Cambarus) pellucidus, Erichson, op. cit., p. 95. 1846. 



Cambarus pellucidus, Girard, op. cit., p. 87. 1852. 

 • Cambarus pellucidus, Hagen, op. cit., p. 55, PI. I. figs. 68-71, 

 PL in. fig. 148, PI. VI. 1870. 



Orconectes pellucidus, Cope, Amer. Nat., VI. 410, 419. 1872. 

 — 3d and 4th Ann. Rep. Geolog. Surv. Ind., pp. 162, 173. 

 1872. 



Orconectes inermis, Cope, Amer. Nat., VI. 410, 419. 1872. — 

 3d and 4th Ann. Rep. Geolog. Surv. Ind., pp. 162, 173. 1872. 



Hab. Mammoth Cave and other caves in Edmonson Co., Ky., 

 VTyandot Cave, Ind., and cave in Bradford, Harrison Co., Ind. 



The Indiana specimens do not differ enough from the typical 

 form from Mammoth Cave to be considered a distinct species, as 

 Cope would have us believe. I have seen the same form from 

 Mammoth Cave. 



In the Berliner Entomologische Zeitschrift, XXVI. 12-14, 

 April, 1882, Gustav Joseph imperfectly describes under the 

 name Cambakus Stygics a blind Crayfish, very closely rented 

 to C. pellucidus, said to have come from the caves of Carniola ! 

 In the earliest notice of this startling discovery in 57th Jabres- 

 ber. Schles. Gesellsch. vaterliiud. Cultur, 1879, p. 202, Breslau, 

 1880, the new species is called Cambai-us ti/phlobius. In a paper 

 published in December, 1881, in Berliner Entomol. Zeitschr., 

 XXV., Joseph again mentions, without describing, the animal 

 under the names Cambarus ccecus (p. 237) and C. Stygius (pp. 

 241, 249). Until a more satisfactory account of this discovery 



