DESCRIPTION OF A NEW SPECIES OF SNAKE FROM 

 CLARION ISLAND, WEST COAST OF MEXICO. 



B}^ Leonharu Stejneger, 



Caralor, Dirision of Reptiles and Bulnichians. 



When exploring- the islands ott and around Lower California in the 

 spring- of IS'JT, Mr, A. W. Anthon}" also visited Clarion Island, the 

 most westerly of the Revilla Gigedo g-roup, a small island situated 

 about 40*) miles southwest from Cape St. Lucas, Lower California. In 

 addition to the f^t(f described from the same localit}" he collected quite a 

 series of a new species of Baseanion, which I take pleasure in naming 

 in honor of its discoverer. 



BASCANION ANTHONYI, new species. 



Diarinofih. — Scales in IT rows; ventrals, lS(3-204; caudals, 97-112; 

 frontal, at a line between centers of eyes, much narrower than supra- 

 ocular; supralabials 8, fourth and fifth entering eye; a subocular; inter- 

 parietal suture much shorter than distance from tip of snout to frontal; 

 color above walnut brown, more or less uniform, and with scattered 

 black spots. 



Type.~Q:Vii. No. 24390, U.S.N.M., Clarion Island. A. W. Anthony, 

 collector. 



Ilahltat. — Clarion Island, Revilla Gigedo group, west coast of 

 Mexico. 



DcHcrlptlon of type specimen. — Adult male: Snout rather prominent, 

 the tip extending considerably beyond the lower mandible; part of 

 rostral visible above nearly equals the length of internasal suture, 

 which is about one-half the length of the interprefrontal suture; fron- 

 tal separated from preoculars, long and narrow, its greatest width 

 anteriorly equaling that of the supraoculars; its width, at a line 

 between the centers of the eyes much narrower than the width of the 

 supraoculars at the same line; its length equals its distance from the 

 tip of snout and is longer than parietals; supraoculars large, broadly in 



Proceedings U. S. National Museum, Vol. XXIII— No. 1231. 



715 



