104 University of California Publications in Zoology 



12). Anterior iliac process: (A) large; (B) small. 



74. Osteoderms (PI. 1): (A) absent; (B) present. 



NONSKELETAL CHARACTERS 



75. Heart (Zug, 1971): (A) does not extend posterior to the transverse axillary plane; 

 (B) extends posterior to the transverse axillary plane. 



76. Subclavian arteries (Zug, 1971; present study): (A) covered ventrally by the 

 posterior end of the M. rectus capitis anterior; (B) not covered by the M. rectus capitis 

 anterior. 



11. Dorsal aorta (Zug, 1971): (A) right and left systemic arches unite to form the 

 dorsal aorta above the heart; (B) origin of dorsal aorta posterior to heart. 



78. Coeliac artery (Zug, 1971): (A) arises from the dorsal aorta anterior to and 

 separate from the two mesenteric arteries; (B) arises posterior to the mesenteries, between 

 the mesenteries, or continuous with one or the other of the mesenteries. 



79. Colic wall (Iverson, 1980): (A) forms one or more transverse valves; (B) forms 

 numerous irregular transverse folds. 



80. Colic valves (Iverson, 1980): (A) all valves semilunar; (B) one or more valves 

 circular (semilunar valves may be present or absent). 



81. Rostral scale: (A) median and azygous; (B) subdivided by a median suture. 



82. Scutellation of snout region: (A) consists of many small scales subequal in size to 

 those of superorbital and temporal regions; (B) consists of relatively few large scales. 



83. Dorsal head scales: (A) flat or slightly convex; (B) pointed and conical. 



84. Superciliary scales (Etheridge and de Queiroz, 1988): (A) quadrangular and non- 

 overlapping; (B) intermediate; (C) elongate and strongly overlapping. 



85. Subocular scales (Etheridge and de Queiroz, 1988): (A) all subequal in size; (B) 

 one or two suboculars moderately elongate; (C) one subocular very long, the rest shorter. 



86. Anterior auricular scales: (A) all relatively small or one row slighriy enlarged; (B) 

 one row of scales anterior to tympanum pointed and gready enlarged, extending posteriorly 

 over tympanum. 



87. Gular fold: (A) conspicuous; (B) weakly developed. 



88. Dewlap: (A) small or absent; (B) present and large. 



89. Gular crest: (A) absent; (B) present. 



90. Middorsal scale row: (A) present; (B) absent. 



91. Pedal subdigital scales I (Fig. 45): (A) anterior keels larger than posterior ones, 

 scales asymmetrical; (B) anterior and posterior keels approximately equal in size, scales 

 roughly symmetrical with respect to the long axis of the toe. 



92. Pedal subdigital scales II (Fig. 45): (A) individual scales entirely separate; (B) 

 scales with greatly enlarged anterior keels fused anteriorly at bases. 



93. Toes: (A) unwebbed; (B) partially webbed. 



