DESCRIPTION OF A LITTLE-KNOWN RATTLESNAKE, 

 CROTALUS WILLARDI, FROM ARIZONA. 



By Frank A. Hartman, 



Of the Queen Anne High School, Seattle, Washington. 



About four years ago Dr. S. E. Meek described'* a new species of 

 rattlesnake as Crotalus willardi from a single specimen collected at 

 Tombstone, Arizona. During the University of Kansas Expedition 

 of 1907 a second specimen of this distinct and interesting species 



Figs. 1-4.— Crotalus willabdi. \\ x nat. size. 1, top of head; 2, side of head; 3, underside of 

 head; 4, head from front. No. 39896, U.S.N.M. 



was collected in the region of the Santa Rita Mountain, Arizona, and 

 has been donated to the United States National Museum. 



In view of the rarity of the species it has been considered desirable 

 to publish a somewhat detailed description of the latter specimen. 



CROTALUS WILLARDI Meek. 



Description. — Cat. No. 39896, U.S.N.M., Santa Rita Mountain, Ari- 

 zona (figs. 1-4). Head long; muzzle narrow, somewhat recurved; 

 rostral higher than wide; anterior nasal in contact with rostral; 

 upper preocular not divided vertically; internasals as long as wide 

 and turned up anteriorly into the canthus rostralis, which is very 

 prominent; seven or eight scales in a line between supraoculars; 

 two rows of scales between eye and supralabials; 14 supralabials on 



a Field Columb. Mus., Zool. Ser., vol. 7, No. 1, January, 1906, p. 18, pi. 3. 



Proceedings U. S. National Museum, Vol. 39— No. 1800. 



569 



