SYNOPSES AND DESCRIPTIONS. 77- 



to more black than yellow. Chin and throat yellowish. Tail generally 

 lighter below. A brown band across the prefrontals through the eye to 

 the angle of the mouth ; a similar band behind the eye on the frontal and 

 supraciliaries, separated from the former by a narrow band of light color. 

 A broader band of brown from each paiietal backward to the neck, and 

 between them on the median line of head and neck a short longitudinal 

 bar. Mississippi Valley to the Atlantic. 



var. nasicus, pi. VI, fig. 6. 



Hetbeodon nasicus Baird & Girard, 1853, Cat. N. A. Serp., pp. 61, 157. 



Rostral more produced and bent; prefrontals more dissected; head 

 bands shorter and broader; belly with large quadrate blotches of dark 

 color to nearly uniform black. Scales in 23 rows. Ventrals 135 — 150. 

 Anal bifid. Subcaudals 34 — 50. Arkansas, Texas, New Mexico, Cali- 

 fornia. 



Var. KENNERLYI. 



Heterodon kennerlyi Kennicolt, I860, Pr. Ac. N. Sc, Phil., 336. 



Head broad, short anteriorly. 



Pattern of colors as in simus, spots smaller, more numerous, dorsal 

 sometimes divided into two alternating series a portion of the length. 

 Belly black, irregularly spotted with white. Oculars, loreal, internasals, 

 azygos, prefrontals, and sometimes, the frontal, more or less cut into small 

 plates. In a specimen before me there are 21 plates in front of supracilia- 

 ries and frontal on the top of the head. Scales in 23 rows, outer broader, 

 smooth, balance keeled. Ventrals 118. Anal bifid. Subcaudals 35 pairs. 

 Mexico. 



Cemophora. 



Cope, 1860. 



Body elongate, subcylindrical ; head rather indistinct ; tail short, conical. 

 Eye small, pupil round. Posterior maxillary teeth longer, smooth. Ros- 

 tral swollen, not keeled. Nasal in two parts, nostril between. Loreal 

 rarely absent. Scales smooth, in 17 — 19 rows. Anal entire. Subcaudals 

 in two rows. 



