NEW RATTLESNAKE FROM- ARIZONA. 857 



without involving them. The scales below this band are 

 vinaceous cream. There are two small seal brown spots 

 on the occiput. The geneials and gulars are yellow 

 tinged with vinaceous laterally. The rest of the head is 

 unicolor. Along each side of the back is a series of from 

 54 to 60 small brown blotches. Anteriorly these have, a 

 tendency to alternate, but posteriorly they unite with one 

 another to form cross-bars. There are seven similar 

 brown bars on the tail. The dorsal blotches are seal 

 brown, palest centrally, and are edged with very pale 

 brown or white. They are about one and one-half scales 

 long, and from two to three rows of scales wide. They 

 are separated from the other blotches on the same side of 

 the back by about one and one -half scales, and from 

 those of the opposite side by the width of one scale. 

 There are two or three rows of smaller alternating brown 

 spots on the sides. The gastrosteges, except anteriorly, 

 are dark slate. The edges of the gastrosteges and of the 

 scales of the first row are whitish. The tip of the tail is 

 bright salmon or flesh-color. 



Length to rattle, 447 mm. 



Length of tail, 41 mm. 



Segments in rattle, 7 + 



One of the five specimens has ten supralabials on one 

 side of the head. 



348 mm. 



341 mm 



29 mm. 



32 mm 



6 



3 + 



