ZOOLOGY REPTILES. 19 



of tail, exclusive of rattles, 2^ inches ; total length, 2 feet 4 inches. Of a larger specimen : 

 length of head, 1| inch ; greatest breadth, 1| inch ; length of body, 2 feet 9 inches ; of tail, 

 exclusive of rattle, 3 inches ; total length, 3 feet 1^ inch. 



Habitat. — Country intermediate between Kun river and Tahon ; also, borders of El Paso 

 creek. 



General Eemarks. — The smaller specimen described and figured in Sitgreaves' report appears 

 to be identical with the confiuentus of Say. C. Lecontei differs from the confluenlus of Say, as 

 characterized by Professors Baird and Girard, in having but two rows of scales between the 

 suborbital series and the supralabials instead of four ; in the fewer number of scales between 

 the nostrils, (4 instead of 6) ; in the less number of dorsal rows ; in the rostral plate being 

 without a margin of white, &c. The stripe from the superciliaries, which is not very distinct, 

 appears to pass over the third and fourth rows of scales above the supralabials in confiuentus 

 the second. 



