SYNOPSES AND DESCRIPTIONS, 113 
Hab. North Carolina to Texas, and through varicties to California and 
Mexico, 
var. SCUTULATUS. 
Cavpisona scuTuLatTa Kenn., 1861, Pr. Ac. N. Se., Phil., 207. 
Rattle and rostral plates as in C. lucifer. Dorsal rows 25; superior 
labials 16; 3—4 rows of inteorbital scales, bounded in front by two shields. 
Yellow stripe from eyebrow above rictus oris. Yellowish-brown, with a 
dorsal series of truncate, brown, yellow-edged rhombs; tail black-ringed. 
(Kenn.) Arizona. 
Colors resembling somewhat those of C, adamanteus. About thirty dor- 
sal rhombs. Rostral higher than wide, upper angle acute, Internasals and 
prefrontals regular, without small scales or plates around them, A pair of 
plates between the front portions of the supraciliaries and a pair of smaller 
ones behind them. Anterior portion of the nasal twice the size of the 
posterior. Two small loreals, one above the other. One or two rows of 
scales between the labials and suborbitals. Scales in 25 series. Ventrals 
172+21, Taken by Dr. Edw, Palmer near San Luis Potosi, Mexico. 
var. ATROX. 
Croratus atrox Baird & Girard, 1853, Cat Serp., pp. 5 and 156. 
Marked by bleached colors, shortening of the rhombs in the dorsal series 
and increase in their number and tendency posteriorly to fuse with the 
lateral spots. Sometimes the anterior infralabials are divided, forming a 
small pair of submentals behind the mental. Labials 14—19. Seales in 
25—27 rows (25—29), outer two or three smooth. Ventrals 179—186+ 
29—24, one to several of the subcaudals paired. Hab. Texas to Mexico. 
CROTALUS MOLOSSUS. 
Croraus MoLossus Baird & Girard, 1853, Cat. Serp., 10. 
Two internasals. Four prefrontals. A pair between the supraciliaries 
in contact with each other and the prefrontals. Labials 18. Infralabials 
17. Scales in 29 rows. 
Yellowish. With a dorsal series of rhombs similar to those of (. ada- 
manteus, with the outer angle produced down the side as a vertical bar, 
centers light, confluent anteriorly. Ventrals 187+25. New Mexico. 
Mem.—you. u—8. 
