55. ITTOEHTNOHUS. 417 



4. Lytorhynclms decurtatus. 



Phimotliyra decurtata, Cope, Proc. Ac. Philad. 1868, p. 310. 

 Salvadora decurtata, Oarm. N. Am. Rept. p. 39 (1883). 

 Phyllorliynchus decurtatus, Stefnegei; Proc. U.S. Nat. Mm. xiii. 

 1890, p. 154. 



Head short and soruewhat arched ; rostral angularly bent, with 

 straight horizontal edge, detached on the sides, the upper portion 

 triangular and completely separating the internasals ; frontal longer 

 than broad ; two or three superposed loreals ; three prse- and three 

 postoculars ; eye separated from the labials by subooulars ; two 

 anterior temporals ; six upper labials ; a single pair of ohin-shields. 

 Scales smooth, in 19 rows. Ventrals 172-177 ; anal entire ; sub- 

 caudals 26-27. Light grey above ; a dorsal series of about thirty 

 parallelogrammic brown blotches ; a lateral series of small spots ; 

 labials and lower parts uniform white. 



Total length 350 millim. ; tail 29. 



Lower California. 



5. Lytorhynchus brownii. 



PhyUorhynchus browni, Stejneger, Proc. U.S. Nat. Mm. xiii. 1890, 

 p. 152, fig. 



Snout moderately long; rostral angularly bent, with straight 

 horizontal edge, detached on the sides, the upper portion triangular 

 and completely separating the internasals ; frontal a little longer 

 than broad, as long as the parietals ; three superposed loreals ; three 

 prse- and four postoculars ; eye separated from the labials by sub- 

 oculars ; temporals smaU, scale-like ; six upper labials ; a single 

 pair of chin-shields. Scales in 19 rows, on the anterior third of 

 the body nearly smooth, but becoming gradually more distinctly 

 keeled posteriorly. Ventrals 159 ; anal entire ; subcaudals 31. 

 Whitish above, with about fifteen saddle-shaped brownish blotches 

 on back and tail ; no lateral spots ; a dark transverse line on the 

 head, passing through the eyes and across the interorbital region ; 

 lower surface uniform white. 



Total length 325 millim.^ tail 42. 



Arizona. 



'VOL. t, '2 is 



