948 



EEPORT OP NATIONAL MUSEUM, 1898. 



third and fourth. Inferior labials seven, fourth largest. Geneials one 

 pair, very short. Scales in seventeen longitudinal rows, nearly square. 

 Gastrosteges one hundred and thirty, one anal 5 urosteges twenty-eight. 

 Measurements. — Total length, 188 mm. ; tail, 23 mm. 



Color above brownish gray, 

 crossed by thirty-one irregular 

 transverse brown bands. These 

 are from one to three scales wide 

 on the back and extend to the 

 gastrosteges. Anteriorly they 

 exhibit a tendency to divide into 

 a dorsal and two lateral series of 

 spots. Eight transverse spots 

 on the tail. First spot on the 

 neck large, produced medially to 

 the occipitals. A brown band 

 extends from one angle of the 

 mouth to the other across the 

 occipitals, involving the tip of 

 the vertical. Another brown band begins upon the upper borders of 

 the lower labial shields, passes through the eye, and crosses the ante- 

 rior j)art of superciliaries and vertical and posterior parts of postfroii- 

 tals and rostral. Dirty yellow beneath and upon the first row of scales. 

 This serpent resembles at first sight a diminutive Heterodon. 



Fig. 241. 



Gyalopium canum Cope. 



X 1.3. 



Sonthern Arizona. 



Cat. NO.S879, U.S.N.M. 



Gyalopium canum Cope. 



CHILOMENISCUS Cope. 



Chilomeniscus Cope, Proc. Acad. Nat. Sci. Phila., 18(50, p. 339; 1861, p. 302; Pioc. 

 U. S. Nat. Mu8., XIV, 1892, p. 593.— Boulenger, Cat. Snakes Brit. Mus., 

 II, 1894, p. 272; Bull. U. S. Nat. Mus., No. 32, 1881, p. 53. 



Bergenia Steindachner, Voyage of the Novara, Y, 1876, p. 92. 



Form stout, body cylindrical, the head not distinct. Muzzle rounded, 

 very prominent, and much depressed. Eostral plate large, with an 

 extensive superior surface, and presenting an obtuse angle between 

 the prefrontals; the inferior surface greater than the superior, owing 

 to the backward position of the mandible. Head shields broad, nor- 

 mal, except in the confluence of the prefrontals with the nasals. 

 Loreal none. One preocular, two post oculars. Scales smooth. Tail 

 short, the urosteges and anal plate divided. Teeth equal, or the 

 posterior a little stouter. Palatine and i)terygoid teeth present. 



