1 



24 



UNITED STATES AND MEXICAN BOUNDARY. 



The vertebral stripe the most distinct; the lateral stripes obsolete on the fourth lateral row on each 

 side. The stripes are formed by scales with the bases black, and the tips of the ashy ground color; the 

 scales involved by the vertebral stripe have their tips even lighter than the ground color. Each dorsal 

 scale appears, on close examination, to be minutely mottled with blackish, and when the skin is stretched 

 the covered base of each scale is seen to be black. Head brownish ash, minutely mottled with blackish; 

 labials lighter. Abdomen uniform greyish white. — (Kexxicott.) 



2103. Valley of Mexico. Dr. T. Potts. 



105. RENA DULCIS, B. & G. 



Bena didcis, B. & G-. Catal. N. A. Serp. Jan. 



San Pedro to Comanche Springs. J. H. Clark. 





