astacid^:. 85 



apex, with sharply recurved margins; lamina of the antennco broad, 

 with a little apical external spine. Hands narrow, nearly cylindrical, 

 densely scabrous; the fingers a little shorter than the hands, thin; 

 carpus longer than broad, scabrous, without spines on the inner side 

 and beneath. Postabdomen nearly as broad as the thorax. The third 

 pair of legs in the male hooked. Long. corp. nearly 2 inch. Mexico." 

 — Erichson. 



I have not seen this species. The hands resemble in shape those of 

 C. JSfebrascensis. 



C. Montezumce Saussure, Kevue et Magas. Zool., T. 9, p. 102, and Mem. 

 Soc. Phys. Geneve, T. 14, PI. II. fig. 22, p. 459, from the marshes of the 

 valley of Mexico, Chapultepec, seems to be the young of C. Mexicamis. 

 It is always difficult to identify or to separate species by the descrip- 

 tions, but I cannot find any difference in the description given by Mr. 

 DeSaussure. It is said that the males of C. Montezumce have hooks on 

 the second and the third pair of legs, and I have seen the same aberra- 

 tion in some species of this group. 



30. Cambarus Cubensis Erichson. 



Canibarus Cubensis Erichson, Wiegmann, Arcliiv, T. 12, p. 100, n. 21. 



" Chelis granulatis, gracilibus, subcylindricis, carpis muticis, rostro 

 lato, apice acuminato. 



" Very similar to C. Mexicamis. Thorax punctulated ; cretas visible, a 

 little divergent behind ; rostrum nearly flat, broad, sharply notched on 

 each side in front. Lamina of the antennaB very broad, nearly truncated 

 before in front, with a little apical external spine. Hands shorter, nar- 

 row, nearly cylindrical, delicately scabrous ; fingers slender ; carpus 

 scabrous, with sharp spines on the inner side ; postabdomen nearly 

 as broad as the thorax. The third pair of legs in the male hooked. 

 Long, corn. 2.3 inch. Cuba." — Erichson. 



I have not seen any species or specimen from Cuba. Perhaps this 

 species belongs to the first group. The words in Erichson's description, 

 literally " rostrum on each side notched in a sharp spine," translated by 

 me " sharply notched," are doubtful. C. consobrinus Saussure, from the 

 same locality, has the rostrum with anteapical spines. I know nothing 

 more about these two species. 



C. consobrinus Saussure, Revue et Magas. Zool., T. 9, p. 101, and Mem. 

 Soc. Phys. Geneve, T. 14, PL II. fig. 21, p. 458, from the marshes in 

 the interior parts of Cuba, cannot be separated from C. Cubensis by the 

 description. Apparently Mr. DeSaussure has seen the two forms of the 

 male ; this supposition would explain his remarks concerning the differ- 

 ences in the hands. But not having seen any specimens from Cuba, I 

 am unable to give a definite judgment. 



