1898.] NATURAL SCIENCES OF PHILADELPHIA. 65 



Brief characterizations of these five species may prove useful : — 



Gerrhonotus principis. 



Lower temporal scales smooth ; dorsal and caudal scales weakly- 

 keeled ; dorsals in fourteen (or 14§) longitudinal rows; dark ventral 

 lines between the longitudinal rows of scales, or absent ; azygous 

 prefontal of moderate size or small; interoccipitals two or three 

 (or 1) ; back without complete dark cross-bands. 



Gerrhonotus burnettii. 



Lower temporal scales smooth ; dorsal and caudal scales strongly 

 keeled; dorsals in sixteen (rarely 15J or 18) longitudinal rows; 

 dark ventral lines between the longitudinal rows of scales, or 

 absent; azygous prefontal usually small or of moderate size; inter- 

 occipitals two to four (rarely 1) ; dorsal color bands usually broken 

 and closer than in G. scincicauda. 



Gerrhonotus palmeri. 



Temporal scales keeled ; dorsal and caudal scales strongly keeled ; 

 dorsals in sixteen longitudinal rows ; dark ventral lines absent (or 

 between the longitudinal rows of scales) ; azygous prefrontal large ; 

 interoccipital normally single ; back without complete dark cross' 

 bands. 



Gerrhonotus multicarinatus. 



Lower temporal scales smooth ; dorsal and caudal scales weakly 

 keeled; dorsals in sixteen (rarely 14 or 14H) longitudinal rows; 

 dark lines along the middle of each of the longitudinal rows of 

 ventral scales ; azygous prefrontal large ; interoccipital normally 

 single ; back with or without complete dark cross-bars. 



Gerrhonotus scincicauda. 



Lower temporal scales smooth ; dorsal and caudal scales strongly 

 keeled; dorsals in fourteen (rarely 12| or 14|) longitudinal rows; 

 dark lines along the middle of each of the longitudinal rows of 

 ventral scales (very rarely absent) ; azygous prefrontal large (rarely 

 moderate-sized); interoccipital usually single; back usually with 

 complete dark cross-bands. 



Principis (B. & G.) finds its home in the Puget Fauna of western 

 Washington and Oregon, and perhaps occurs in the mountains 

 of northern California. G. burnettii Gray occupies a narrow strip 

 along the coast of California from Monterey to Mendocino County. 

 G. palmeri (Stejneger) is native to the western slope of the Sierra 



