114 DIADOPHIS. 



plate subpentagonal, less tapering posteriorly than in D. punctatus, 

 and subacute. Occipitals narrow and elongated. Frontals as in D. 

 jmncfafus. Superciliaries narrower, and nearly of the same width 

 throughout their length. Upper labials 7 ; 6th largest. Lower 

 labials 8 ; 5th largest. Scales rather short, subelliptical, consider- 

 ably larger on the sides than on the back, especially the outer row. 

 Color of the abdomen extending to the outer row of scales, the pos- 

 terior portion of which alone is black. Numerous small spots are 

 scattered all over the lower part of the body, from the head to near 

 the end of the tail. The upper surface and sides of head, as well as 

 the labials of both jaws and chin, are blackish brown. The abdomen, 

 in life, is in all probabilities purplish, judging of it from traces of 

 that color left beneath the tail of one of the specimens preserved in 

 alcohol. 



San Jose, Cal. 182+1. 59. 15. 12i 2 /g. Dr. J. L. Leconte. 

 « — '— 15. 9^ 2. " 



3. DiadoplliS tlocilis, B. & G. — Body above uniform ash-gray; 

 yellowish white heneath, spotted with black. A proportionally broad yel- 

 lowish white occipital ring, margined with a narrow black line. Dorsal 

 scales in 15 rows. 



Head narrower than in D. amabills. Vertical plate subpentago- 

 nal, elongated, sides nearly parallel to the point where it enters be- 

 tween the occipitals. Prefrontals and eyes proportionally much 

 smaller than in D. amahiUs. Body very slender, covered with pro- 

 portionally large scales. Head above blackish brown. Upper labials 

 and head beneath yellowish, mottled with black. Occipital ring yel- 

 lowish white, covering the length of three scales. The anterior black 

 margin passes to the black spots along the labials. Small black spots 

 are irregularly scattered all over the abdomen ; they form one series 

 on each side, along the exterior and posterior margin of the scutellte, 

 to the tip of the tail. All the scales are uniform ash-gray, but when 

 examined closely they appear punctured with minute black dots. 

 The bases of the scales are black when stretched apart. The tail 

 beneath is almost unicolor, exhibiting but very few dots. 



R. San Pedro of " 

 R. Grande, or \ 193+1.57.15. llf 2^. Col. J. D. Graham. 

 Devil's River. 



