610 ZOOLOGY— REPTILES AND BATRAOHIANS OF ARIZONA. 



11-13, inferior 12-13. Dorsal rows, 21; the scales slightly carinated; each 

 scale along the middle of back with a tubercular swelling toward the center. 

 Crown tubercular. Entire head and upper parts of alight yellowish, with a 

 dorsal series of small indistinct blotches, below which are several irregular 

 rows of isolated brown dots ; a narrow brown stripe from orbit back over 

 angle of mouth. — (Kcnnicott.) 



The singular development of the supraorbital plate into a hom-like 

 process, contact of prenasal with rostral, and turgidity of the dorsal and 

 coronal scales, may be considered sufficient grounds for the establishment 

 of a section of the genus, as above indicated. 



This rather small species is found with C. tigris in the arid region of 

 the Gila and Colorado, where it is common. In the position of the nostrils, 

 it appears related to Aploaspis, Cope, type C. lepida, Kenn. (Proc. Phila. 

 Acad., 1SG1, 206). This last species, described from Western Texas, will 

 probably yet be found to inhabit Arizona. 



40. Crotalus edwardsi (Bd. & Gir.) Cope. 



Crotalophorus edwardsii, Bd. & Gir., Cat. N. A. Rept, 1S53, 15. — Dum. & Bibr., 

 Erp. Gen., vii, 1853.— Bd., P. R, R. Rep., x, 1859, pi. 24, f. 8 (no text).— Id., 

 U. S. & Mex. Bound. Surv., ii, pt. ii, 1859, Reptiles, 15, pi. 5, f. 1. 



Crotalus edwardsii, Cope, Mitchell's Res., 1801, 125. 



Caudisona edwardsii, Cope, Check-List, 1875, 34. 



Twenty-three rows of dorsal scales ; two first rows smooth. Verti- 

 cal plate subpentagonal, tapering to an acute point posteriorly. Color 

 light yellowish-brown, with chestnut blotches, lighter than in C. tergeminus 

 or C. consors. Lateral blotches proportionally small. Yellowish line from 

 nostril to angle of mouth as in C. consors; no vertebral reddish line. — 

 (Baird.) 



This species, with which I did not myself meet, occurs on the southern 

 border of the Territory. Specimens have been described from Sonora on 

 the Mexican boundary line; Tamaulipas, Mexico; and Brownsville, Texas. 



< 'rotalus miliarius is a species probably to be added to the fauna of 

 Arizona. 



