CROCODILIANS, LIZARDS, AND SNAKES. 



855 



margius of the fourth and fifth upper labials; lower labials twelve, 

 seventh largest. Postgeneials narrow, separated by three scales, divided 

 transversely so as to differ little from gular scuta. Dorsal rows of 

 scales twenty-seven, long* and lozenge shaped; five median dorsal rows 

 slightly carinated. General color above (alcoholic) warm grayisli-ash, 

 beneath yellowish; behind occii)itals two converging oblong brown 

 blotches, and posterior to 

 these a series of narrow trans- 

 verse brown blotches, eighty 

 in number, becoming obsolete 

 near caudal extremity; these 

 blotches are six scales in 

 width. Laterally, below, 

 there is a correspondingseries 

 af irregular blotches on both 

 sides, almost obsolete. Along- 

 upper border of abdominal 

 scutelhe, on both sides, are 

 strongly marked small black 

 blotches at intervals of two, 

 sometimes three scales. An- 

 terior portion of abdominal 

 scutelLne black, maculated; on 



Fig. 198. 



Coluber bairdii Yarrow. 



X 1.3. 



Fort Davis, Texas. 



Cat. No. 10403, U.S.N.M. 



head a black baud begins at anterior margin of superciliary and 

 extends nearly across and to nearly the entire widrh of the postfrontal; 

 upper labial margined with blackish-brown posteriorly, lower labials 

 also; a blotched line of blackish-brown extends from posterior lower 

 angle of orbit to angle of mouth; under surface of jaw yellowish white. 



Cat. No. 10403; urosteges, 99 ; scales, 27; total length, 382 mm. ; tail, 91 mm. 



The nine superior labials and divided postgeneials distinguish this 

 species readily from all other ISI^orth American forms. The coloration 

 is also entirely peculiar.^ 



COLUBER MUTABILIS Cope. 



Coluber mutaUlis Cope, Proc. Am. Phil. Soc, 1884, p. 175. 



Coluber triaspia Cope, Proc. Am. Phil. Soc, 1879, p. 271 ; not of Cope, Proc. Acad. 



Nat. Sci. Phila., 1886, p. 128.— Boulenger, Cat. Snakes Brit. Mus.. II. 1894, 



p. 37. 

 Natrix mutabilia Cope, Bull. U. S. Nat. Mus., No. 32, 1887, p. 71. 



Scales in 31-3 rows; one loreal; eight upper labials; three rows of 

 temporal scuta; dorsal and lateral spots smaller and separated; three 



