ILLUSTRATIONS V 



Figure Page 



30. Geographic variation in number of supralabials in Pituophis melano- 



leucus melanoleucus 58 



31. Geographic variation in number of infralabials in Pituophis melanoleu- 



cus melanoleucus 58 



32. Geographic variation in number of dorsal spots in Pituophis melano- 



leucus melanoleucus 58 



33. Distribution map of the four subspecies of Pituophis melanoleucus and 



of the two subspecies of P. sayi 66 



34. The color pattern of Pituophis melanoleucus mugitus 70 



35. Geographic variation in number of dorsal spots on the tail in Pituo- 



phis melanoleucus mugitus 71 



36. Geographic variation in number of ventrals in Pituophis melanoleucus 



mugitus 71 



37. Geographic variation in number of caudals in Pituophis melanoleucus 



mugitus 71 



38. Geographic variation in number of supralabials in Pituophis melano- 



leucus mugitus 72 



39. Geographic variation in number of infralabials in Pituophis melanoleu- 



cus mugitus 72 



40. Geographic variation in ratio of tail length to total length in Pituophis 



melanoleucus mugitus 72 



41. The color pattern of Pituophis melanoleucus ruthveni 75 



42. The color pattern of Pituophis vertebralis 85 



43. Geographic variation in number of scale rows in Pituophis veretehralis . . 86 



44. Geographic variation in number of ventrals in Pituophis vertebralis 87 



45. Geographic variation in number of caudals in Pituophis vertebralis 88 



46. Geographic variation in number of supralabials in Pituophis verte- 



bralis 88 



47. Geographic variation in number of infralabials in Pituophis vertebralis. 89 



48. Geographic variation in ratio of tail length to total length in Pituophis 



vertebralis 89 



49. Geographic variation in total number of dorsal spots in Pituophis verte- 



bralis 90 



50. The color pattern of Pituophis sayi sayi and P. s. affinis 99 



51. Geographic variation in number of scale rows in Pituophis sayi sayi.. 100 



52. Geographic variation in number of ventrals in Pituophis sayi sayi 101 



53. Geographic variation in number of caudals in Pituophis sayi sayi 102 



54. Geographic variation in number of infralabials in Pituophis sayi sayi. 103 



55. Geographic variation in number of postoculars in Pituophis sayi sayi. 103 



56. Geographic variation in ratio of tail length to total length in Pituophis 



sayi sayi 104 



57. Geographic variation in total number of dorsal spots in Pituophis sayi 



sayi 105 



58. Geographic variation in number of scale rows in Pituophis sayi affinis. 127 



59. Geographic variation in number of ventrals in Pituophis sayi affinis-. 127 



60. Geographic variation in number of caudals in Pituophis sayi affinis 128 



61. Geographic variation in ratio of tail length to total length in Pituophis 



sayi affinis 129 



62. Geographic variation in total number of dorsal spots in Pituophis 



sayi affinis 129 



63. Distribution map of the two subspecies of Pituophis sayi, the three 



subspecies of P. catenifer, and P. vertebralis 132 



64. The color patterns of the three subspecies of Pituophis catenifer 144 



