CRAYFISHES. 367 



simulans, but the smallest of the three is smaller in C. simulans than in C. gracilis 

 and lacks the horny texture ; in C. hagenianus the truncate end of the gonopods 

 bears but two teeth. 



In the second form of the male the gonopods are less j^erfectly finished at 

 the tips, the terminal teeth being blunter and membranous. The annulus 

 ventralis of the female C. hagenianus is much like the annulus of C. gracilis, 

 being produced on each side of the median line into a prominent tubercle, each 

 tubercle tending to denticulation. 



The specimens from Muldon, Miss., are peculiar in having a beard along 

 the internal border of the upper face of the hand in the males, as in Camharus 

 barbatus and Astacus gambelii. 



Colour of living specimens from Muldon, Miss.: — Male (Plate 1, fig. 2), 

 metacarapace violet-gray with round greenish spots on the branchial regions; 

 procarapace greenish, dashed with red anteriorly; abdomen light orange, with 

 two longitudinal rows of irregular olive spots; chelae and carpus olive, the 

 tubercles and granules green; fingers and antennae orange, beard whitish. 

 Female (Plate 1, fig. 1), metacarapace bluish; procarapace, abdomen, and 

 chelae tending to green at the expense of the orange tints. 



Few cases of colour differences correlated with sex have been noted among 

 Crustacea. See Andrews, Zool. Anz., Apr. 25, 1911, 37, p. 401. 



Cambarus versutus Hagen. 

 New locality: — Auburn, Lee Co., Alabama (M. C. Z.). 



Cambarus blandingii (Harlan). 



New localities: — Virginia: Cape Henry, Princess Anne Co. (U. S. N. M.). 

 North Carolina: Mattamuskeet Lake, Hyde Co. (U. S. N. M.); Reedy Fork, 

 Cape Fear River, Greensboro, Guilford Co. South Carolina: Charleston Co. 



(U. S. N. M.). 



Cambarus blandingii acutus (Girard). 



New localities: — Illinois: Greathouse Creek, Wabash Co. (U. S. N. M.). 

 Arkansas: Bruce Lake, Little Rock, Pulaski Co. (U. S. N. M.). Maryland: 

 Fulton Co. (U. S. N. M.). Mississippi: Rosedale, Bohvar Co. (U. S. N. M.). 

 Louisiana: Frierson, De Soto Co. (U. S. N. M.). Texas: Angelina River 



(U. S. N. M.). 



