By James Ray Dixon

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Prefrontal scales in contact, separating rostral from frontal scale; colorpattern of narrow transverse brown bands on a grayish ground color: head also banded:adults ~sually less than IZ inches (30 cm) in length but may reach 15 inches (38 cm) ......... WESTERN NOOK-NOSEDSNAKE G~alopio~ canu~ Prefrontal scales not in contact, rostral contacts frontal; body with small and usually obscure transverse brownish bands or blotches; ground color grayish brown to pale brown; head seldom has bands; adults usually less than 1 2 inches (30cm), but may reach 19inches (48cm) .............................

Dorsal scale rows equal in size; supranasals separating nasals from internasals ........ DESERT SIDE-BLOTCHED LIZARD Uta stans~uriunas t e j ~ e ~ e r i Three or more dorsal scale rows much larger than others: no scales betweennasals and internasals ...................................................... TREE LIZARD" Urosaurusornatus Tree Lizard Central dorsal row of keeled scales less than one-half size of largest dorsal scales: large scales in even rows .............................. EASTERN TREE LIZARD Urosaurus ornutus or~atus Central dorsal rowof keeled scales morethan one-half sizeof largest dorsal scales; large scales in uneven rows ...........................

34 Black bands on neck number one or two ........................ CHIHUAHUAN COLLARED LIZARD ~ r o t u p ~ ~collaris t u s fuscus 34. Head width equal to or greater than distance between ear and nostril ................. LONG-NOSED LEOPARD LIZARD G a ~ ~ e lwislizeni iu wislize~ 35. Dorsal scale rows equal in size; supranasals separating nasals from internasals ........ DESERT SIDE-BLOTCHED LIZARD Uta stans~uriunas t e j ~ e ~ e r i Three or more dorsal scale rows much larger than others: no scales betweennasals and internasals ......................................................

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