22 A KEVISION OF THE ASTACID./E. 



are the same in all essential regards, and specimens intermediate in the form 

 of the hands, rostrum, and antennal scale are frequently met with. 



Two dry male specimens in the Museum of the Academy of Natural Sci- 

 ences of Philadelphia, from Kemper Co., Miss., labelled " G. acntissimiis ? " are 

 probably types of the species described under that name by Girard. They 

 appear to be young specimens of C. acutus. 



The specimens of C. Blandingii, var. ucuta, received from the Western 

 States differ somewhat from those of the Southern States, as pointed out 

 by Hagen on page 36 of the Monograph of the North American Astacidse. 

 They form a sub-variety designated by the letter A. 



Dr. Hagen considers Le Conte's A. Blandingii to be his C. Lecontei. No 

 type of Le Conte's species is known, but the description and habitat (middle 

 regions of Georgia and Carolina) fit Blandingii better than Lecontei. 



Gibbes and Girard seem to have confounded this species with C. troglo- 

 dytes. There is a specimen of G. troglodytes in the Museum of Comparative 

 Zoology, sent by Gibbes with the label " Astacus Bkndingi Had.," and the 

 localities given by him,* viz. " the low country of South Carolina," and by 

 Girard, viz. " Summerville, S. C.," refer to G. troglodytes. 



From Montgomery, Ala., comes a form which agrees with G. Blandingii in 

 all respects except the male sexual appendages, which approach those of 

 G. Lecontei in the curvature of the two anterior apical teeth. The posterior 

 apical tooth is straight, as in G. Blandingii. In many of the larger specimens 

 there are three spines on each side of the telson. This may perhaps prove 

 to be a distinct species. 



Two female specimens in the Museum of Comparative Zoology, from 

 Dallas, Texas, agree well with G. Blandlngii, but it is difficult to determine 

 them positively in the absence of male specimens. They were collected by 

 J. Boll, and are labelled " Burrowing Crabs." 



In specimens of var. aciifa, subvar. A, from the West, that have not lain 

 long in alcohol, the rostrum is red (in some specimens only a pair of red 

 blotches at the base), and there appears a good deal of red color on the 

 dorsal side of the abdominal segments and the basal segment of the telson 

 and Mummm-ls. Living specimens of C. Blandingii collected by me near 

 Trenton, N. J., arc of a dull greenish brown, whitish beneath and on the 

 lower part of the carapace, with a dark-greenish longitudinal stripe on each 



(in tlu- <Vrii,ol,,Lr, r al (VII,,. li,,ns ,,f the Cabiliets of Xulunil History in the United States. Proc 



\ \,l. ,, , ,, iii?--jui. 1850. 



