CROCODILIANS, LIZARDS, AND SNAKES. 



823 



white interspaces faintly "powdered" with brown on the sides; hinder 

 supralabials with the i)osterior margin dark brown; lower surface uni- 

 form white. 



This species diflfers in many important jjoints from the previously 

 described Ph. decurtatus, from Lower California. It is of stouter build, 

 with a proportionately longer tail ; the dorsal scales are decidedly keeled 

 on the posterior two-thirds of the body, while in Ph. decurtatus they 

 are all smooth; the number of gasterosteges is larger and the urosteges 

 fewer; in Ph. decurtatus the rostral seems to be thicker, and the shields 

 on the sides of the face are fewer; finally, the coloration is very differ- 

 ent, Ph. hrownl having only fifteen dorsal blotches and no lateral spots, 

 against double the number of dorsal blotches and very j)ronounced 

 lateral spots in Ph. decurtatus. 



Phyllorhynchiis irowni Stejneger. 



PHYLLORHYNCHUS DECURTATUS Cope. 



Phyllorhynchiis decurtatus Stejneger, Proc. U. S. Nat. Mus., XIII, 1890, p. 154. 

 Fhimothyra decurtata Cope, Proc. Acad. Nat. Sci. Phila., 1868, p. 310; P)Ull. U. S. 



Nat. Mus., No. 1 (1875), pp. 38, 92.— Yarrow, Bull. U. S. Nat. Mus., No. 24 



(1885), pp. 15,99. 

 Salvadora decurtata Garman, N, Am. Serp. (1883), pp. 39,145; Bull. Essex Inst., 



XVI, 1884, p. 25.— Cope, Bull. IT. S. Nat. Mus., No. 32 (1887), p. 72.— BocouRT, 



Miss. Sci. Mex., Kept., Pt. 11 (1888), p. 663. 

 Lytorhynchus decurtatus Boulenger, Cat. Snakes Brit. Mus., 1, 1893, p. 417. 



Scales smooth throughout, in nineteen rows; 2-3 loreals; labials six 

 and nine; gastrosteges 172-177, anal entire; urosteges 26-27, divided; 



Fig. 186. 



Phyllokhynchus decurtatus Cope. 



X 1.5. 



La Paz, Lower California. 



Cat. No. 12i;3'', U.S.N.M. 



tail about one-eleventh of total length ; upper surface with about thirty 

 " am phicd'olus" brown blotches on back and tail, alternating with a 

 more or less double series of smaller spots of same color on the sides. 



