82 HERPETOLOGY OF MICHIGAN. 



g^ Dorsal scale rows never less than 21- 



23-21-19-11. JS^atrix sipedoii, p. 95. 



g-. Dorsal scale rows never more than 



19-17. 



li^ A light lateral stripe on the 1st 



and 2nd roAvs, no dorsal 



hlotches. Reg hia leheris, p. 98. 



h^. No light lateral stripes, dorsal 



blotches present 



Clonophls kirtlancU, p. 100. 

 C-. Dorsal scales not keeled. 



d^. A single nasal plate pierced by the nostril. 



Liopeltis vernalis, p. 102. 



d". Two nasal plates, the nostril between them. 



e^. A vellow collar. Uniformlv blackish above, 



Diadophis punctatiis, p. 104. 



e-. Xo vellow collar, adults uniformly sreen to 



blackish above, young spotted. 



Bascanion constrictor, p. 107. 



b". Anal plate entire. 



c^. Dorsal scales smooth. Dorsal blotches present. No 



fiiv\i)QH. . . .Lampropeltls doJlatus triangutus, p. 110. 



C-. Dorsal scales keeled, a dorsal and two lateral (one on 



either side), light stripes ThamnopMs. 



d^. Tail generally more than .27 of the total length, 



Thamnophis saiiritus, p. 113. 



d". Tail Generally less than .27 of the total lencjth. 

 e^. Lateral stripe on the 2nd and 3rd rows. 



Labials generally 7/10 



ThaiiuiopJiis sirtaUs, p. 119. 



e-. Lateral stripe on the 2nd, 3rd, 4th rows an- 

 teriorly." Labials generally 6/8 



Thanniophis hutleri, p. 116. 



a-. A pit between the eyes and nostril. Tail (in all but very young 



individuals) terminating in a rattle 



^^istrurus catenatus, p. 124. 



