14. GERRHONOTUS 443 



miles south from Mt. Sanhedrin), Sonoma (seven miles 

 west from Cazadero, Monte Rio, Guerneville, Freestone, 

 Duncan Mills, Kidd Creek, Healdsburg, Skaggs Springs, 

 Camp Meeker), Marin (Inverness, Mill Valley, Sausalito, 

 Phoenix Gulch, Angel Island, Lagunitas, Rock Spring, 

 Tamalpais, Lagunitas Creek), Alameda (Redwood Can- 

 yon), San Francisco (Presidio, Golden Gate Park, Lake 

 Merced, San Miguel Hills), San Mateo (Searsville, Pes- 

 cadero, Pescadero Creek, Mussel Rock, San Pedro Point, 

 Mo Nuevo Island), Santa Clara (Palo Alto), Santa Cruz 

 (Boulder Creek, Big Trees, Glenwood, Soquel), and Mon- 

 terey (Pacific Grove, Cypress Point, Carmel) counties. 



Remarks. Specimens from the northern portion of the 

 range of this species seem to differ in coloration from those 

 taken south of San Francisco Bay. There is so much indi- 

 vidual variation that the difference is difficult to describe. 

 It may be said to consist in an approach, in the northern 

 specimens, to the types of coloration of G. principis and G. 

 falmeri. It is hard to decide what valuation should be put 

 on these differences. While they might be considered evi- 

 dence of intergradation between the three species, no such 

 intergradation is apparent in scale characters. It might be 

 best to divide G. cceruleus into two subspecies, but I hesi- 

 tate to do this for the reason that individual variation is so 

 great as to make most difficult any definite expression of the 

 average geographical difference. 



Habits. These slow-moving lizards may easily be 

 caught on the sand hills of San Francisco, where they are 

 very common. They are insect-eaters, feeding chiefly upon 

 beetles. Females usually show little resentment when han- 

 dled, but males often become very angry and will hiss and 

 bite fiercely, although unable to draw blood. A captive 

 male would hiss and jump at my fingers whenever the door 

 of his cage was opened. The skin is renewed, sometimes at 



