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 perfectly 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 Cambarus 
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:— Vircinta: Cape Henry, Princess Anne Co. (U.S. N. M.). 
Nort Carona: Mattamuskeet Lake, Hyde Co. (U.S. N. M.); Reedy Fork, 
Cape Fear River, Greensboro, Guilford Co. SourH Caroxina: Charleston Co. 
(U.S. N. M.). 
CAMBARUS BLANDINGII AcuUTUS (Girard). 
New localities:— Inurno1s: Greathouse Creek, Wabash Co. (U.S. N. M.). 
ArKANSAS: Bruce Lake, Little Rock, Pulaski Co. (U.S. N. M.). Marynanp: 
Fulton Co. (U.S. N. M.). Musstssrppr: Rosedale, Bolivar Co. (U.S. N. M.). 
LovursiaNa: Frierson, De Soto Co. (U. S. N. M.). Trxas: Angelina River 
(U. S. N. M.). 
