55. LTTOKHTNCniJS. 417 



4. Lytorhynchus decurtatus. 



Phimotliyra deciirtata, Cope, Proc. Ac. Philad. 18G8, p. 310. 

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

 Phyllorliynclms decui'tatus, Stejneger, Proc. U.S. Nat. Mm. xiii. 

 1890, p. 154. 



Head short and somewhat 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 praj- and three 

 postoculars ; eye separated from the labials by suboculars ; two 

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



Phyllorhynchus browni, Stejneger, Proc. U.S. Nat. Mus. xiii. 1890, 

 p. 16-2, 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 

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

 oculars ; temporals small, 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. i> 2 fi 



