15-2 



NEW GENUS OF COIiUBRINE SNAKE STEJNEGER. 



Tlie most conspicuous characters which separate Phyllorhynchus from 

 Salvador a may be tabulated as follows : 



Phyllorhynchus browni sp. no v. 



DiAaNOSis. — Scales distinctly keeled on the posterior two thirds of 

 the body, in 19 rows; 4 loreals; labials f ; gasterosteges 159; anal en- 

 tire; urosteges 31, divided; tail about one-eighth of total length; upper 

 surface with about ]5 saddle-shaped brownish blotches on back and tail 

 no lateral spots. 



Habitat. — Tucson, Arizona. 



Type.— JJ. S. N"at. Mus., Fo. 15719; Herbert Brown coll. 



f natural size. 

 Phyllorhynchus browni, U. S. Nat. Mas., No. 15719. 



Description of type specimen. — Rostral very prominent and broad, re- 

 curved on the top of the snout so as to separate the supranasals en- 

 tirely and the prefrontals partially, with free lateral edges which are 

 rather sharp and thin; lower side of rostral deeply concave; two pre- 

 frontals; frontal large, hexagonal, as broad as long; parietals scarcely 

 longer than frontal, their width equaling their length; at their posterior 

 border a broad but very short shield with a median groove in contin- 

 uation of the interparietal suture; nostril large, opening between the 

 two large nasals and overhung by the prominent lower edge of the 

 supranasal; the loreal proper high and narrow surmounted by a small 

 supraloreal which joins the supranasal, the upper preorbitals, and the 

 prefrontals, being a detached portion of the latter; between the loreal 

 proper and the supralabials two small subloreals; three preoculars, 

 upper largest and not in contact with the frontal ; two suboculars ; 

 four postoculars; three anterior temporals, upper largest; six supra- 

 labials, the two posterior largest (on the left side a narrow portion of . 

 the last is divided off anteriorly by a vertical suture not shown in the 



