CROCODILIANS, LIZARDS, AND SNAKES. 



941 



to a narrow but obtuse angle. Loreal minute, with an acute apex for- 

 ward. First temporal longer than deep; it is as deep as long in C. e. 

 iso::oims. Gastrosteges, one hundred and forty-four; uiosteges, forty; 

 the latter vary from fifty to fifty- three in the C. c. i.sozonus. The 

 ground color is similar to that of the C. episcopus, an<l there are black 

 crossbars which are less numerous and narrower tlian in the C. e. 

 i.sozonus. There are twenty-two on the body and some obsolete specks 

 on the tail. Lower surfaces everywhere immaculate. The crossbars 

 appear as spots on the fourth and fifth rows of scales, and are better 

 defined between these rows, and are one and a half to two scales wide. 

 In G. e. isozoiius the black bands are three and four scales wide and are 

 equidistant, and those of the tail are distinct on both superior and 

 inferior surfaces. 



Measurements. — Total length, 238 mm.; tail, 4t mm. 



Chionavtis epiacopns inozonus Cope. 



Catalogue 

 No. 



2109 

 8179 



11417 

 8601 



14813 

 15530 

 157U3 

 15715 

 19352 



Number 

 of speci- 

 mens. 



Localitv. 



Sonora, Mexico 

 Utah , 



Fort Whipple, Arizona. 

 Fort Mohave, Arizona . . 

 Utah 



When 

 collected. 



From whom received. 



Nature of 

 specimen. 



Col. J. D.Graham, U.S.A. Alcoholic. 



Exp. W. of 100th M. 



Dr. E.Coues, U.S.A. 



Dr. O. Loew 



A.L.Siler 



Fort Verde, Arizona Dr. E. A. Mearns. 



Prescott, Arizona 



do 



Mexican boundary line. 



W. L. Carpenter . 



do 



Dr. E. A. Mearns. 



Alcoholic 



type. 

 Alcoholic. 



do. 

 Alcoholic 



type. 

 Alcoholic. 



do. 



do. 



do. 



do. 



Catalogue! ^J'l^l^T 



Locality. 



Gainesville, Texas 



From whom received. 



G. H. Ragsdale. 



CHIONACTIS OCCIPITALIS Hallowell. 



Chionavtis occipitale Cope, Proc. Aciul. Nat. Sci. I'hila., 18()t), p. 310; Proc. U.S. 



Nat. Mus., XIV, 1892, p. (505. 

 Bhinosioma occipitale IIaiamwkia., Proc. Acad. Nat. Sci. Phihi., 18r)4, p. 95. 

 Lamproaoma occipitale H.\li,()\vi:ll, Proc. Acad. Nat. Sci. Phila., \K\C), ]>. olO. — 



Baird, U. S. Mex. Bound. Survey, 1859, p. 21, pi. xxi, lig. 1. 

 Contra occipitalis Boulkngeu, Cat. Snakes Brit. Mus., II, 1894, jt. 266. 



Head small, of same breadth posteriorly as neck, depressed in front; 

 snout rounded; rostral plate large, excavated below, presenting a tri- 

 angular shape above and in front, where it forms the extremity of the 

 muzzle; internasals smaller than the i)refrontals, their inner margins 

 much shorter than their external, which are in contact with the upper 

 margins of the nasal plates; the prefrontals are more or less pentangu- 

 lar in shape, the posterior margin of each in contact with the anterior 

 margin of the anteocular, the supraocular, and the half of the frontal 



