618 NORTH AMERICAN SNAKES — COPE. 



and turned over on top of the muzzle. Two species are known, both 

 from the Sonoran region. They differ as follows: 



Scales keeled ou posterior two-thirds of body ; tail oue-eighth of total length ; about 

 fifteen dorsal and no lateral spots P. broivnii. 



Scales all smooth; tail shorter, about one-twelfth the length; about thirty dorsal 

 spots and one or two rows of lateral spots P. decurtatus 



Phyllorhynchus bro-wnii Stejneger. 



Proc. U. S. Nat. Mas., 1890, p. 152. 

 One specimen from Tucson, Ariz. 



Phyllorhynchus decurtatus Cope. 



Stejneger, Proc. U. S. Nat. Mas., 1890, p. 154. 



Phimoihyra decurtata Cope, Proc. Phila. Acad., 1868, p. :U0 ; Id., Bull. U. S. Nat. Mue., 

 No. 1, pp. 38, 92 (1875) ; Yarrow, Bull. U. S. Nat. Mns., No. 24, pp. 15, 99 (1885). 



Salvadura decurtata Garnian, N. Anier. Serp., pp. 39, 145 (1883); Id., Bull. Essex lust., 

 XVI, p. — ; List N. Auier. Rept. Batr., p. 25 (1884) ; Cope, Bull. U. S. Nat. Mus., 

 No. 32, p. 72 (1887) ; Bocourt, Miss. Scientif. Mex. Eep., 11 livr., p. 663 (1888). 



Lower California. 



DROMICUS Bibron. 



Histoire de 1' Isle de Cuba par de la Sagra, 1843, p. 225 ; DunK^ril et Bibron Erp. Gen., 

 VII, 1857, p. 646; Cope, Proc. Acad. Phila., 1862, p. 76. 



Posterior maxillary tooth longer than the others and separated from 

 them by a space ; palatine teeth present. Cephalic plates normal ; two 

 nasals and a loreal. Kostral not produced. Scales smooth, without 

 fossa?. Preanal plate divided. Tail elongate. Pupil round. 



This genus embraces a dozen species of medium and small size, from 

 the West India Islands, with one species from the southeastern United 

 States. Several species from Mexico are provisionally referred to this 

 genus. The large West Indian species, with double-scale fossiB, for- 

 merly referred to Dromicus, are Colubrina', related to Drymobius, and 

 form the genus Alsophis Cope. 



The North American species, D. JiavUatus Cojie, is one of the smaller 

 forms of the genus. 



Scales in seventeen rows; superior labials seven ; tail entering the length 3i times. 

 Yellowish brown, first two rows of scales yellow-edged; below, and labials white; 

 a brown band from nostril to last labial D. fiavilatua. 



Dromicus flavilatus Cope. 



Proc. Acad. Phila., 1871, p. 222; Check List N. Amer. Batr. Kept., 1875, p. 38; Proc. 

 Amer. Philos. Soc, 1878, p. 64 ; Proc. U. S. Nat. Mus., 1888, p. 386. 



From the coast of North Carolina to Florida, inclusive. 



SALVADORA Bd. and Gird. 



Cat. Serp. N. Amer., 1853, p. 104; Cope, Bull. U. S. Nat. Mus., 32, 1887, pp. 57, 72. 

 Phimotlujra Cope, Proc. Acad. Phila., 1860, 566; Check List, Batr. Rept. N. Amer., 

 1875, p. 38. 



Form elongate, head distinct from body. Cephalic plate normal, ex- 

 cept rostral shield, which is expanded laterally with more or less free 



