NOTES ON" THE GENUS KINOSTERNON STEJNEGER 459 



Paratypes.— U.S.N. M. Nos. 13910 9, 13911 9, 13913 9, same data 

 as holotype; U.S.N. M. No. 6556 cf , Yucatan, Progrcso, A. Schott, 

 collector; Philadelphia Acad. No. 94, Yucatan, A. SchoU, collector. 



Dimensions of holotype. — Length of carapace, 104 mm., width 68 

 mm. ; length of plastron 97 mm. 



Remarks. — -Two species of the genus Kinosternon occur in Yucatan, 

 viz, the present representative of K. cruentatum and the other K. 

 creaseri described a few years ago by Dr. Norman Hartweg (Occas. 

 Pap. Mus. Zool. Univ. Michigan, No. 277, Jan. 2, 1934, p. 1) from 

 specimens collected at Chichen Itza. Unfortunately he does not 

 describe the dorsal keels and the width of the central laminae, but as 

 he compares his specimens with K. berendtianum and as I have before 

 me two specimens also from Chichen Itza, with broad central laminae, 

 I have no reason to doubt that they belong to K. creaseri and that 

 consequently two species are represented in the state of Yucatan. 



Only six specimens, three males and three females, are available for 

 the evaluation of this form, but they display such unusual uniformity 

 that there is little doubt as to the justification of its nomenclatorial 

 recognition. Moreover, the two specimens from the north coast of 

 Yucatan agree so well with the Cozumel Island specimens that the 

 latter can have no claim to be regarded as a purely insular race. The 

 relationship to K. cruentatum is unmistakable, and while the differences 

 separating them are of significant magnitude, there is enough overlap 

 to make the application of a trinominal advisable. 



. S. GOVERNMENT PRINTING OFFJCE: 194 



