CROTALOPHORUS. 15 



The color underneatli is blackish brown intermingled with yellowish. 

 Racine, Wise. 150. 21. + !. 25. 29^ 2f. Dr. Hoy. 



Grosse Isle, Mich. 136. 31. 25. 19f. 2^^ Rev. Chas. Fox. 

 Warren Co., Ohio. 141. 29. 25. 28|. 3f. Dr. J. P. Kirtlaud. 



4. CrolalopSaoi'MS Edwaa-nlsii, B. & G. — Twenty-three rows of 

 dorsal scales ; first and second lateral row smooth. Vertical plate subpen- 

 tagonal, tapering posteriorly. Lateral rows of blotches proportionally very 

 small. 



The ground-color is yellowish brown with three lateral series of 

 deep chestnut-brown blotches. Two elongated brown blotches ex- 

 tend from the supercilliaries backward. A narrow band of chestnut 

 brawn, fi'om the posterior frontal plates, passes over the eyes to the 

 neck, under which a yellowish stripe extends from the nostril to the 

 angle of the mouth. The snout and upper jaw are brown with two 

 yellow fillets diverging from the pit. The lower jaw and chin are 

 mottled with brown and yellow. There are about forty-two dorsal 

 brown and irregular blotches margined with deep black and encircled 

 ■with a yellow fillet, from the head to the tip of the tail — the 34th 

 opposite the anus — the last three passing to the sides of the tail 

 but do not meet below. Subcircular on the posterior half of the 

 body, the blotches on the anterior half are longer transversely than 

 longitudinally; emarginated anteriorly only. 



The blotches of the two lateral series are proportionally small. 

 The blotches of the upper series are more or less obsolete and alter- 

 nate with the dorsal ones. Those of the second lateral series are the 

 smallest and alternate also, being of as deep a color as the dorsal 

 ones, but do not extend beyond the anus, occupying the second, third, 

 and fourth rows of scales. The first and lower series afi'ect the first 

 and second rows, and only one scale. The belly is of a light straw 

 color, dotted and sprinkled irregularly with brown. 



Scales elliptical, subtruncated posteriorly, constituting twenty-three 

 rows, strongly carinated, except the two lateral rows, which are 

 smooth. 



Head, when seen from above, subelliptical ; vertical plate propor- 

 tionally more elongated than in C. terrjeminus. 



Tamaulipas. 143. 28.+3. 23. 17^.2^. Dr. Edwards. 



S.Banh of Rio Grande. lb%. 14:. 23. 11. 1|. Gen. Churchill. 

 Sonora. ' 145.26. 23. 8*. li. Col.J.D.Graham. 



