CAMBAEUS. 51 



Cambarus Aztecus, as described and figured by Saussure, has a shorter. 

 Ilaitcr hand, and carpus spinous on internal border.* Von Martens (Arch. 

 Naturgesch.j XXXY1II. Jahrg., I. 131) would separate it from ('. Mexicanus. 

 Dr. Eagen has kindly given me the following note on the types of Saussure 

 in the Berlin Museum, which he examined in September, 1870. 



"The first form of the male and the female, from Mexico, seem to be 

 0. Mexican iis Erichs., with nearly cylindrical hands. The second form, with 

 more flattened hands, belongs alone, then, to Saussure's C. As/ecus. In the 

 second form the antennal scale is more broadly truncate in front, and the 

 rostrum is a little different, but these differences are not striking enough to 

 preclude the identity." 



A sketch of the first form male appendages, made from one of these 

 types by Dr. Hagen, shows them to be of the same form as in the specimen 

 I have described above. 



The female specimens noticed on page 39 under C. Wiegmanni have a 

 shorter and broader chela and carpus, the granules on the internal margin 

 of the carpus assuming the character of spinules. As there are no male 

 specimens among them, I am not sure that they are not the female of 

 C. Aztecus Saus. ; but this point, as well as the identity of C. Aztecus and 

 ('. Mexicanus, I must leave unsettled for lack of material. 



Saussure's locality for C Aztecus is, • Les ruisseaux du Mexique. — Pris 

 a Tomatlan, dans les Terres-Chaucles." According to Von Martens (Arch. 

 Naturgesch., XXXVIII. Jahrg., I. 130) there are specimens in the Berlin 

 Zoological Museum from Puebla. 



18. Cambarus Cubensis. 



Plate II. fig. 1, Plate VIII. figs. 5, 5, 5 a. 5 a'. 



Astacus {Cambarus) Cubensis, Erii bson, Arch. Naturgesch., Ml. Jahrg., L. 100, 1846. 



us consobrinus, Sai ssi be, Rev. el Mag. de Zool., 2« Se>., IX 101, L857. — Mem. Soc. I'hys. Hist. 

 Nat. Geneve, \l\. 157, PI [II. fig 21, 1858. 

 Giimbarus Cubensis, Bagi s, III. Cat. Mus. Comp. Zool., No. III. p. 85, 1870. (Alter Ericbson.) 

 Cambarus Cubensis, Von Mabtens, Arch. Naturgesch., WW III. Jahrg., I. 129, 1872. 

 Cambarus Cubensis, Faxon, Proc. Amer. Acad, Arts and Sci., \ \ II-'. L884 



Male, form I. — Rostrum triangular, moderately excavated, acumen short, 

 acute, small lateral teeth at base of acumen. Anterior end of post-orbital 



* "Cambarus Aztecus. Rostre court, arrondi an boul Carenes laterales obtuses, ne se temiinaiil pas 



en une dpiue. Carapace ponctudi gram It coti a a portion anterieure, mais sans epines au bord 



i oblique. Mains me'diocres ou petites, i primdes, fortemenl granuleu es el i icailleu es ; carpes 



ecailleux, arrays de petiti \k\ i n d'dpines. Pattes de la troisieme paire, chcz 



[e male, armies, a leur base, d'une apophyse rudimeutaire. Long . 2 pouces. Mexique." Sai ssi rj 



