146 
Journal of the Mitchell Society [ December 
37. Head large, broader than the neck. |Anal plate divided. 
Spotted Racer. Rat Snake {Coluber guttatus) . 
Head small, not broader than neck. Anal plate undi- 
vided. Milk Snake {Ophibolus doliatus triangulus ). 
38. Head large, broader than neck. Anal plate divided. 39. 
Head small, not broader than neck. Anal undivided. 
Brown King Snake {Ophibolus rhomb omaculatus ) . 
39. ^Scales in 25 or 27 rows. 40. 
Scales in 19 rows. 41. 
40. Underparts yellowish. Striped Chicken Snake , young. 
Underparts slaty black behind, whitish in front. Chicken 
Snake, young. 
41. §Upper lip plates 7 on each side. Black Snake, young . 
Upper lip plates 8 on each side. Coachwhip, young. 
42. Snout recurved and keeled. 43. 
Snout not recurved and keeled. 44. 
43. Small plate just behind snout plate with several small 
scales round it. Snout more strongly recurved and 
keeled. Hognosed Snake {Heterodon simus). 
Small plate just behind snout plate without any small 
scales round it. Snout less strongly keeled and recurved. 
Spreading Adder (H. platyrhinus) . 
44. Anal plate undivided. Ground color whitish with 
dark spots on back. Bull Snake {Pityophis melanoleu- 
cugs). 
Anal plate divided. 45. 
tAnal plate is the plate immediately in front of the vent, which in most 
of our forms is divided longitudinally into two pieces, but in some it is 
undivided. 
iRows of scales are counted diagonally beginning with the row just above 
the belly plates and are usually uneven in number. 
§Tlie upper labials or lip plates are the plates along the edge of the 
upper lips, excluding the plate at tip of snout. 
