REPTILES FROM So. CALIF. AND L. CALIF. MEEK 19 



ten rows between their anterior angles ; first three rows of scales with- 

 out keels. 



Color light olive brown, more or less irregularly blotched with 

 white; dorsal region crossed by nineteen lighter bands, each one scale 

 length in width and narrowly margined with black; dorsal transverse 

 bars about nine scale lengths apart ; no transverse bands on tail ; ven- 

 tral surface much speckled and mottled with black, becoming darker 

 posteriorly; small black dots on sides, these most numerous near ven- 

 tral region; supraocular light ash color; a large ashy blotch on 

 occiput more or less reticulated posteriorly with darker; snout and 

 region between supraoculars olive brown; a distinct white line one 

 scale wide from upper edge of prenasal above pit to upper edge of 

 seventh supralabial, passing obliquely downward to tenth supra- 

 labial and backward covering the last four supralabials ; a white line 

 on lower half of first five supralabials, passing downward and back- 

 ward on lower jaw to white on throat; the space between these bands 

 brown; rostral with white median line. 



In general, this species bears some resemblance to Crotalus lepidus 

 Kennicott. It differs in being light brown instead of greenish gray, 

 and in having shorter transverse dorsal bars, which are much lighter 

 than the ground color, instead of black cross bars, which are so 

 characteristic of C. lepidus. 



Named for Professor F. C. Willard, of Tombstone, Arizona, its 

 discoverer. 



