BRANSON : SNAKES OF KANSAS. 357 



COLUBRID-ffi 



PITYOPHIS HOLBROOK. 



Pityophis Holbrook, N. Amer. Herpetology, IV, 1842, p. 7; Baird and Girard, 

 Cat. N. Amer. Kept., Pt. I, Serp., 1853, p. 64. 



Churchilla Baird and Girard, Reptiles in Stansbury's Expl. Great Salt Lake, 

 1852, p. 350. 



Maxillary teeth equal. Rostral high, recurved. Loreal pres- 

 ent. One preocular (occ. two). Three to six prefrontals. Two 

 nasals. Head broad behind. Size large. Body spotted. 



Sey to species. 



Rostral prominent; head bands distinct; headlong; spots small and numerous. 



P. cateni/er. 

 Rostral more prominent ; no head band ; head short; spots few and large. 



P. nielanoleucus. 

 Pityophis catenifer Blainville. 



Bull Snake, Western Pine Snake. 



Coluber catenifer Blainville, Nouv. Ann. Mus. Hist. Nat., LV, 1835, p. 290. 



KEY TO SUBSPECIES OF CATENIFER. 



Rostral very high, recurved P. catenifer sayi. 



Rostral lower, less curved. . P. catenifer bellona. 



Rostral low and broad P. catenifer catenifer. 



Pityophis catenifer sayi Schlegel. 



Bull Snake. 



Coluber sayi Schlegel, Ess. Phs. Serp., II, 157, 1837. 



Pityophis sayi Baird and Girard, Cat. N. Amer. Rept., Pt. I, Serp., 1853, 

 p. 151. 



Pityophis mexicanus Dumeril and Bibron, Erp. Gen., VII, 1854, p. 236. 



Pityophis sayi sayi Cope, Check-list N. Amer. Batr. Rept., 1875, p. 39. 



Dorsal scales in twenty-seven to thirty-three rows ; all keeled 

 excepting first five to ten rows. Occipitals broken up into 

 many small plates posteriorly, Superciliaries broad behind, 

 narrow in front. Prefrontals 3-7. Internasals rounded in 

 front. Rostral very high, strongly curved. Two nasals — an- 

 terior larger; nare mostly in posterior. Loreal trapezoidal. 

 Oculars 1-3 (occ. 2-3). Superior labials 8-10; seventh and 

 eighth largest, fifth entering orbit. Inferior labials 10-13, 



