CINOSTERNUM. 13 
1. Shell with three keels. 
A. Sternum with anotch behind . . ..... . . . OC. sonoriense, p. 18. 
B. Sternum not notched behind. 
1. Jaws spotted. 
a. Axillary and inguinal scutes separate. . . + - ; C. cruentatum, p. 18. 
b. Axillary and inguinal scutes joining each other . . C. triliratum, p. 14. 
2. Jaws uniform yellowish. . 2. - - ee ee es G albogulare, p. 14. 
TI. Shell with one keel or none. 
A. Sternum with a notch behind. 
1. Jaws spotted 2 6-6 ee ee ee es C. hirtipes, p. 15. 
2. Jaws yellow 2... - ee 8 ee ee eee C. integrum, p. 16. 
B. Sternum without a notch. 
1. Jaws spotted . 2 6 ee ee ee ee es C. effeldti, p. 16. 
2, Jaws uniformly coloured. 
a. A joint between posterior lobe and middle of 
sternum. . . 2. + 6+ © © © © © © 8 # 8 
b. A straight suture between posterior lobe and middle of 
sternum; axillary and inguinal scutes separate. . C. brevigulare, p. 17. 
c. A curved suture between posterior lobe and middle of 
C. leucostomum, p. 17. 
sternum ; axillary and inguinal scutes in contact . C. cobanum, p. 18. 
1. Cinosternum sonoriense. 
Kinosternum sonoriense, Leconte, Proc. Ac. N. Sc. Philad. 1854, p. 184. 
Thyrosternum sonoriense, Agass. Amer. Testud. p. 428, t. 5. figs. 8-11 (young). 
Hab. Mexico, Tucson, Sonora (Leconte), Guadalupe, Cafion Sonora (Agassiz). 
Shell with three keels, but the lateral are obsolete and scarcely to be traced, except 
on the two last costal scutes. Sternum emarginate behind. Head and neck black, 
above mottled and spotted with whitish, beneath whitish, varied in the same manner 
with dusky ; jaws horn-colour, varied with black. The anterior joint of the sternum 
ligamentous, the posterior sutural, the hind lobe not entirely closing the box of the 
shell. Gular plate large, equilaterally triangular. 
Of this species I have not seen any examples, and the characters are taken from 
Leconte’s description. His specimen was 4:4 inches long. Gray considered his K. 
punctatum, based upon a very young example from East Florida, to be identical with 
the Sonora species. But this is very doubtful, and unfortunately cannot be determined 
from the type specimen, which is in a very bad state of preservation. 
2. Cinosternum cruentatum. (Tabb. IX., X., XI.) 
Cinosternum cruentatum, A. Dum. Cat. Méth. Rept. p. 16; and Arch. Mus. vi. p. 238, t. 16. 
fig. 1,2; Dum. & Boe. Miss. Sc. Mex., Rept. p. 23; Bocourt, Journ. Zool. 1876, p. 398. 
Kinosternum mexicanum, Leconte, Proc. Ac. N. Se. Phil. 1854, p. 182. 
Swanka scorpoides, Gray, Suppl. Cat. Shield Rept. p. 67 (part.). 
