37 

 tains Province. 



100. Hendricks, F. 1975. Biogeography, natural history and systema- 

 tics of Cnemidophorus tigris (Sauria; Teiidae) east of the Continental 

 Divide. PH.D. DISSERTATION, TEXAS A & M UNIVERSITY. 227 p. 



Scutellation and various aspects of color pattern are analyzed by 

 univariate and multivariate statistical techniques for populations from 

 the complete geographic extent of the range of this species in the area 

 of interest. A remarkably complete review of the literature on this 

 species is provided. This study confirms the ecological characteris- 

 tics documented for this species. _C. tigris is never found in habitats 

 with dense grass or shrubs, or on inclines exceeding 30°, and rarely on 

 those exceeding 15°. It is also unusual to find _C. tigris in areas not 

 dominated by creosote; where it is found elsewhere, the species fre- 

 quents mesquite hummocks in sandy terrain. Creosote communities occu- 

 pied are usually on gravelly to rocky well-drained terrain such as al- 

 luvial fans. It is never found at elevations exceeding 5000 feet and 

 is fairly uncommon above i+OOO feet. The range of _C. tigris is conse- 

 quently somewhat disjunct in the Basin and Range topographic province; 

 maps are provided of both. Three new subspecies are named; diagnoses, 

 descriptions and photographs of the types are provided. One, _C. t. re - 

 ticuloriens , occurs in the Pecos River drainage of New Mexico as well 

 as parts of west Texas and Mexico. _C. t. marmoratus occurs in the Rio 

 Grande drainage of New Mexico, the Tularosa Basin and westward to the 

 Continental Divide, as well as into west Texas and parts of adjacent 

 Mexico. These two subspecies belong to the same species cluster. It 

 is believed that the subspecies provide geographically and taxonomi- 

 cally identifiable entities while the species clusters more realisti- 

 cally indicate units of evolution. Glacial and interglacial sequences 

 during Pleistocene time are discussed as the most probable cause for 

 the fractionation and differentiation of C. tigris east of the Conti- 

 nental Divide today. Some quite tentative inferences about predation 

 and population structure are drawn based upon the museum specimens ex- 

 amined for this study. The latter do, however, conform to what has 

 been previously suggested by other workers. There is not a bimodal 

 pattern of emergence of hatchlings as could be inferred from previous 

 field work—that is, hatchlings begin to appear, a single numbers peak 

 is achieved and then emergence falls off. 



101. Holland, R. L. 1965. A comparative study of morphology and 

 plasma proteins of the blood in the lizard species Cnemidophorus tes - 

 selatus (Say) (Reptilia: Teiidae) from Colorado and New Mexico. M.A. 

 THESIS, UNIVERSITY OF COLORADO. 116 p. 



Electrophoresis of plasma and erythrocyte proteins were performed 

 on lizards from 3 populations: near Pueblo, Pueblo Co. and on the Pur- 

 gatoire River, Las Animas Co., Colorado, and near Caballo Dam, Sierra 



