364 CRAYFISHES. 



Messrs. Palmer and Riley, July 8, 1900. It may be an immature specimen of 

 one of the races of C. cuhensis, or possil^ly a nearly allied species. 



Since the above paragraph was written, and the specimen returned to the 

 United States National Museum, Dr. A. E. Ortmann ' has described as a new 

 species, Ccmibarus {Procamharus) alkinsoni, a crayfish collected by Dr. A. Atkin- 

 son in the tributaries of Rio de los Indios, Los Indios, Isle of Pines, May 25, 

 1910. It is closely related to C. cuhensis, from which it differs principally in the 

 much less dilated inner face of the copulatory organs of the male. 



Cambarus cubensis consobrinus Saussure. 



Cambarus consobrinus Sauss., Rev. ct M:ig. Zool., 1857, ser. 2, 9, p. 101; Mem. Hoc. Phys. Hist. Nat. 



Geneve, 1858, 14, p. 457, pi. 3, fig. 21. 

 Cambarus cubensis consobrinus Faxon, Bull. Mus. Comp. Zool., Oct. 1912, 54, p. 458. 



In this form of the Cuban Crayfish the rostrum is narrower than in tiie 

 typical C. cubensis, more deeply concave above, its margins more distinctly 

 raised and less convergent between the Isase and the pair of latei'al spines near the 

 distal end ; these lateral rostral spines, moreo\'er, are much better developed than 

 in the typical form, and the rostral acumen is longer; the post-orbital ridge is 

 more prominent, distinctly grooved along its outer face, and produced anteriorly 

 into an acute spine much more strongly emphasized than in the typical C cuhen- 

 sis; there is, too, an evident lateral spine on each side of the carapace, on the hind 

 border of the cervical groove, — a spine which is not present in C. cubensis cuben- 

 sis. The external sexual organs are alike in the two forms. 



Nine specimens of this crayfish (5 cf , 4 9 ), M. C. Z., No. 7,343, were secured 

 by Dr. Thomas Barbour from lads who were using them for fish-bait, at San 

 Antonio de los Banos, in the interior of the Province of Habana, Cuba, April, 

 1909. 



Cotypes of Saussure's Cambarus consobrinus are now dispersed among the 

 Museums of Geneva, Paris, Berlin, i^nd Washington. It is very likely that 

 Saussure's material included some of the typical form of C. cubensis; his descrip- 

 tion and figures, nevertheless, were grounded on the form with long rostral acu- 

 men, and distinct rostral and lateral thoracic spines; the type locality of conso- 

 brinus, moreover, as specified by Saussure, is the central part of the island. 



In the cotype in the U. S. National Museum (No. 20,684, ex Mus. Geneva), 



' A New Species of the Genus Cambarus from the Isle of Pines. Ann. Carnegie Mus., May 5, 1913, 

 8, p. 414-417. 



