light dots in color pattern; with two dark bars posteriorly on each side, 

 extending diagonally on both dorsal and ventral areas; Ariz, to Texas 



Holbroo]{ia texana (Troschel) Zebra-tailed Lizard 

 Tail flattened only at base; tail with a median row of dark spots below; 

 no light dots in back pattern; no distinct dark bars on sides; Texas 



Holbroo\ia lacerata Cope White-bellied Lizard 



74. Dorsal scales each with a median, lengthwise keel; no blue tinge about 

 the two dark bars on each side of belly of males; Texas 



Holbroo}{ia propinqua B. 6? G. Rough-scaled Spotted Lizard 

 Scales of back not keeled, although often with keeled scales on legs and 

 tail; color characters various 75. 



75. Back with many small light spots that obscure the rows of dark blotches; 



supraoculars (large scales covering region of the eyeball) usually ad- 

 jacent to frontal plate; Ariz. 



Holhroo\ia elegans Bocourt Slender Spotted Lizard 

 (Holhroo\ia maculata ihermophxla Barbour) 

 Back usually with a pattern of dark blotches in lengthwise rows, as well 

 as scattered, small, light spots; with a row of tiny scales between the 

 supraoculars and the frontal 76. 



76. Tail usually well over length of head and body (to anus) ; Ariz. 



Ho\hroo\ia pulchra Schmidt Mountain Spotted Lizard 

 Tail seldom much, if any, over length of head and body 77. 



77. Usually with lengthwise light stripes between the rows of dark blotches; 



throat of male plain; no blue about dark bars on sides of belly; Wy- 

 oming and Nebraska to Texas and Ariz. 



HolhrooXia maculata maculata (Girard) Common Spotted 

 Lizard 

 Less distinctly light striped; throat of male pigmented; with blue color 

 about the dark bars on sides of belly; N. M. and Ariz. 

 Holhroo\m maculata approxwiaris (Baird) 

 Rio Grande Spotted Lizard 



78. Toes without spines; back usually grayish, with pale spots, and with 



dark spots or blotches in lengthwise rows; Nevada to Cal. and Ariz. 

 Calhsaurus draconoxdes Blainville Gridiron-tailed Lizard 

 (Includes C. ventralis (Hallowell) ) 

 Toes each with a row of short, spiny scales, separated by tiny scales from 

 the ventral toe plates; dorsal color usually in a regular black netv^'ork 

 enclosing small light areas, some of each of which may have a central 

 dark dot 79. 



79. With dark lines directed diagonally backwards on each side of throat, 



broadening and joining medianally to form dark, V-shaped or cres- 

 cent-shaped markings; Cal. 



Uma scoparia Cope Mohave Desert Lizard 

 Diagonal dark lines on throat fading out toward the mid-line 80. 



80. With a dark blotch on each side of the belly; Ariz, and Cal. 



Uma notata notata Baird Colorado Desert Lizard 

 Belly plain light colored; Cal., Riverside County 



Uma inornata Cope Riverside Desert Lizard 



375 



