no. 2078. REPTILES OF NORTHWESTERN NEVADA— RICHARDSON. 419 



intermingled with lighter, and are darker laterally and ventrally. 

 The following table will give the range of variation in adults. Meas- 

 urements of four Arizona specimens are given for comparison: 



Fort 

 Lowell 



and 

 Tempe, 

 Arizona, 

 4 males. 



Vicinity of Pyramid 

 Lake, Nevada. 



Ten 

 males. 



One 

 female. 



16.1 



18.1 

 20.3 



18 



20.8 



24.9 



75 



94 



107 



104.9 

 124.4 

 141.5 



34.5 

 39.6 

 44.5 



51.9 

 59.1 

 65 



23.2 

 26.4 



28 



11 



11+ 



13 



32 



33+ 



35 





16 





17 





82.2 





109 





34.9 





52.9 





24 



12 



13 



33 





Head, length: 



Minimum 



Average 



Maximum 



Head, width: 



Minimum 



Average 



Maximum 



Length from snout to anus: 



Minimum 



Average 



Maximum 



Length of tail: 



Minimum 



Average 



Maximum 



Length of fore leg, including claw: 



Minimum 



Average 



Maximum 



Length of hind leg, including claw: 



Minimum 



Average 



Maximum 



Length of longest toe, including claw: 



Minimum 



Average 



Maximum 



Femoral pores: 



Minimum 



Average 



Maximum 



Dorsal scales from interparietal to point above posterior surface of thighs: 



Minimum 



Average 



Maximum 



20 



20.8 

 22.5 



23.5 

 24.5 

 26.8 



104.5 

 113.2 

 119.5 



139 



150.2 



157 



45 



46.9 



51.4 



68 



71.6 



76 



28 



30.6 



32.5 



12 



13+ 



15 



31 

 32 

 34 



Habits. — At Derby Sceloporus magister was found in two distinct 

 habitats, in and about bushes near the river where it was found most 

 abundantly, and on rocky hillsides. At Wadsworth it was taken 

 in bushes not far from the river. In the vicinity of Pyramid Lake 

 it was observed in bushes along the river, on tufa cliffs near the lake, 

 or on volcanic rocks in the near by hills, also along the lake shore, but 

 never very far out on the desert. 



As it runs from bush to bush Sceloporus magister lifts its tail above 

 the level of its body in much the same manner as Cdllisaurus, a trait 

 which facilitates rapid movement over the sand. It is occasionally 

 seen basking on rocks in company with the smaller Sceloporus 

 biseriatus. This lizard is an adept climber and ascends to the tops 

 of tall bushes with great ease. 



SCELOPORUS GRACIOSUS Baird and Girard. 



Locality. — The collection contains specimens of this small Scelo- 

 porus from Tallac, California, and from Carson City, Palisade, and 

 Deoth, Nevada. The only other records from the Lahontan Basin with 



