132 TANTILLA. 



5J. Tantilla gracilis, B. & G. — Anterior and postorbitals one each. 

 Color uniform greenish brown above, lighter beneath ; head darker. 



Vertical plate subhexagonal, much shorter than in T. coronata. 

 Postfrontals separated from 2d upper labial by the postnasal. Nostril 

 in the postmargin of the prenasal. Eyes very small and circular. 

 Superciliaries proportionally smaller and narrower than in T. coro- 

 nata. One anteorbital and one postorbital, both angular. Mouth 

 deeply cleft. Upper labials 6 ; 5th and 6th equally larger than the 

 rest; 3d and 4th beneath the eye, entering slightly into the orbit 

 anteriorly and posteriorly. Temporal shields two, narrow and elon- 

 gated. Body slender and subcylindrical, covered above with sub- 

 rhomboidal or elliptical and smooth scales, constituting 15 rows ; 

 outer row but slightly larger than the three or four succeeding rows. 

 Tail very slender. 



Ground-color uniform greenish brown, lighter beneath. Head 

 darker. 



Indianola. 129+1. 45. 15. 7i. If. Col. J. D. Graham. 

 " — — 15. « 



