1190 



REPORT OF NATIONAL MUSEUM, 1898. 



keeled. Total number of rows twenty-three, the median very strongly 

 keeled, none rugose striate as iu C. adamanteus atrox. Crepitaculum 

 moderate, its segments diminishing in breadth toward its extremity. 

 Gastrosteges, one hundred and sixty-six. Urosteges, twenty-three sin- 

 gle, three pair double. 



Measurements. — Total length (including crepitaculum), 29 inches 9 

 lines; tail, 4 inches 3 lines. 



General color above light grayish brown, shaded with yellow; vertex 

 rugous, marked with a pair of small brown spots. A light band bor- 

 dered with dark crosses each superciliary plate; from the inner border 

 of the same plate begins a chestnut brown band, which diverges 

 from its fellow on the posterior part of the head, where it is either 

 interrupted or continuous Avith a broader one which nearly joins that 

 of the opposite side on the neck; here they are either interrupted, or 

 continuing, unite on the neck, and form the first spot. A brown baud 

 extends from the eye to the cauthus oris, involving the last labial i)late, 

 and is continued beyond, forming a spot on each side the throat. A 

 series of about thirty-three spots are longer than broad, emarginate 

 anteriorly and posteriorly; opposite to each is a black spot upon scales 

 of the first, second, and third rows. The dorsal spots become broader, 

 resembling transverse rhombs, with light borders outside the black; 

 the lateral angles become confluent with the lateral black spots, forming 

 vertical black bands on the sides. They finally assume the form of 

 transverse brown bands. The tail is crossed by five of these, upon a 

 brown ground. Beneath yellow; tips of many of the gastrosteges 

 blackish. Inhabits Lower California, whence specimens have been seut 

 to the Philadelphia Academy and Smithsonian Institution by Mr. John 

 Xautus. Type 46G3. Xautus collection. 



This species bears considerable resemblance to G. inolossus in its 

 style of coloration, and, like it, is a beautiful animal. The latter species 

 is scutellated upon the muzzle, as in C. durisstis, the rows of scales are 

 more numerous than in C enyo, and it is without the head stripes. 



Cat. Nos. Scales. 



5291 25. 



12623 25. 



Crotaltis enyo Cope. 



This species does not appear to range to the north of the Cape St. 

 Lucas zoological district. Mr. Van Deuburgh records six specimens 

 from San Jose del Cabo. 



