258 



PROCEEDINGS OF THE NATIONAL MUSEUM 



The very high lamellae count of C. velox apparently is unrelated to 

 scansorial ability, for this teiid rarely climbs. Instead, might the 

 lamellae count be correlated with a longer toe, as Hecht (1952, p. 116) 

 has suggested in other lizards? The number of lamellae cannot be 

 used as an index of relative climbing ability here; its inapplicability 



90 



E 80|- 



X 



:z 



UJ 



> 



I 



O 



C/) 



60 



50 



40 



=,,,,0, 



10 



15 



20 



25 



30 



35 



LAMELLAE 



Figure 4. — Relationship of the number of fourth-toe lamellae to snout-vent length in 

 adults of some Zuni lizards. (Outside limits of the plotted points are joined to form 

 polygons representing each species. Means are indicated by position of the symbols.) 



I Phrynosoma douglassi 

 A Eumeces multwirgatus 

 A Sceloporus undulatus 



X Sceloporus graciosus 

 9 Urosaurus ornatus 

 O Cnemidophorus velox 



with respect to the observed inbergeneric differences is apparent 

 (fig. 4). Ecological separation is indicated, however; C. velox in- 

 habits areas of greater insolation than the other nonclimbing species 

 (table 2). Its congeners maintain much higher body temperatures 

 than the other genera studied (Bogert, 1949; Fitch, 1956b). 



