2 University of Michigan 



teeth in general longer anteriorly, scaphiodont, but occasion- 

 ally the last few smaller, hence soinetimes kumatadont; head 

 distinct ; cephalic plates normal ; eye large, pupil round ; scales 

 smooth, in 17 or 15 rows, when 17, reduced to 13 or 12 by 

 the loss of both lateral and dorsal scale rows, when 15, usually 

 reduced to 12 or 11 by the same method, if reduced only to 

 13, fifth lateral row lost; anal plate divided; form elongate; 

 tail very long ; caudals in two series ; penis bilobed, sulcus 

 simple, spines 30-75. and in 2-5 longitudinal rows, calyces in 

 9-14 rows. 



Genus Coluber 



Diagnosis: ^Maxillary teeth solid, 13-16 in number, increas- 

 ing in size posteriorly, diastema usually present; dentary teeth 

 strong and stout, subecjual in general, longer anteriorly, but 

 last few at each end of series smaller; head distinct; cephalic 

 plates normal; eye large, pupil round; scales smooth, in 17 or 

 15 rows, when 17, always reduced to 15 by the loss of a lat- 

 eral row on each side of the body, when 15. no reduction; 

 anal plate divided ; form elongate ; caudals in two series ; penis 

 bilobed, sulcus simple, spines 90-135, and in 6-9 longitudinal 

 rows, calyces in 6-8 rows. 



Amekicax Species ok Coluber and jMasticophis 



Alasticophis (B. & G.) ruthveni Ortenlnirger 



anthonyi (Stej.) schoUi B. & G. 



aurigulus (Cope) scmilineatus (Cope) 



barbouri (Van Denburgh) taeniatus girardi (Stej. & Barb.) 



flagellum flagellum (Shaw) taeniatus taeniatus (Hallow.) 

 flagellum flavigularis (Hallow.) 



flagellum frenatus (Stej.) Coluber (L.) 



lateralis (Hallow.) constrictor constrictor (L.) 



lineatus (Bocourt) constrictor flaviventris (Say) 



mentovarius (Dumcril & Bibron) constrictor mormon (B. & G.) 



piceus (Cope) oaxaca (Jan) 



