26 PROCEEDINGS OF THE ACADEMY OP 



tinned towards the angles of the jaws, where yellow reticula- 

 tions appear above it. 



Measurements. M. 



Length of carapace (straight) 0.18 



" " " (overall) 23 



" " plastron 126 



" " " anterior lobe from hyo-hyposternal suture . . .056 

 " " " posterior lobe from same point 069 



Width " " at ano-femoral suture 018 



" " " anterior lobe at anterior abdominal suture . . .058 



" " bridge (least) 018 



" " head at tympana 051 



Length of " " (straight) . . . . . . .053 

 " " tail from anus 024 



Width of palm (greatest) 030 



" " sole " 035 



This species was found at Santa Efigenia, on the western side 

 of the Isthmus of Tehuantepec, Mexico, by Francis Sumichrast, 

 and sent b3^ him to the collections of the Smithsonian Institu- 

 tion. (Coll. No. 485.) I am indebted to the secretary, Prof. 

 Henry, for the opportunity of making an examination of it. 

 Prof. Sumichrast says of it in his notes, that it is rare, and out- 

 lives in muddy pools. In the young the dorsal crests are more 

 distinct. During life the anterior lobe of the sternum possesses 

 a slight mobility, which disappears on drying. 



CLAUDIUS PICTUS, Cope, sp. nov. 



Staurotypus salvinii, Bocourt, Miss. Sci. Mex. Rept. 22, tab. v., fig. 3, 

 1870; nee Grayii Proc. Z. S. Lond., 1864. 



This fine species has been identified by MM. Dume'ril and Bo- 

 court with the species described by Dr. Gray, as above cited; but 

 it appears to me to be very distinct and perhaps pertinent to 

 another genus. Dr. Gray describes the anterior lobe of the ster- 

 num in S. salvinii as narrowed like the posterior, while it is 

 broadly rounded in this animal. He also states that in his species 

 the tail has a median crest of compressed tubercles, as in Che- 

 lydra, with a lateral series on each side. In this species there are 

 four series of minute warts, as in the other Claudii, and in no 

 way resembling those of Chdijdra. This is evidently not Gray's 

 species, and it remains to compare it with the Claudii, and espe- 

 cially with C. severus. It diners from this tortoise in the cara- 



[June 25, 



