348 



REPORT OF NATIONAL MUSEUM, 1898. 



four-fifths tbe length of cephalic i>lates. Scales on back very large, 

 broader than long, all distinctly carinate semicircular or subrhomboidal 

 behind, with a free spine and three or four lateral denticulations. 

 Lower ones distinctly notched. Those on inside of tibia smooth. 

 Scales on middle of back decidedly larger than those on rump, but 

 smaller than those on tail; not conspicuously larger than those on 

 sides. About forty oblique series from head to tail, or twenty-seven 

 from the series intersecting the lateral gular fold. Femoral pores 

 about sixteen. 



rig. 50. 



SCELOPORUS TORQUATUS PEALE AND GREENE. 



X g. 



Cat. No. 71-22, U.S.N.M. 



Color dark green above, with a neutral black collar bordered before 

 and behind by light yellowish green, this anteriorly interrupted by 

 black. Middle of back and nape spotted with light greenish. Beneath 

 yellowish. Male with chin and sides of belly blue. 



The most difficult problems to settle in the genus Sceloporus are the 

 limits of the species S. torquatus and JS. undulatus. With considerable 

 material and the experience of Mr. Bocourt before me, I do not feel that 

 I can make more than a contribution to the qxiestion as regards the 

 8. torquatus. The collection of individuals I include under that name 



