NORTHERN OLIVE WARBLER 153 



of Cape San Lucas. * * * On February 5, 1924, I saw another of these little 

 warblers, within a few feet of me ; but my gun was not at hand, so I had to be 

 content with a sight record. The locality was inland, at El Oro, on the east 

 side of the Victoria Mountains, about thirty miles from Todos Santos. The 

 next occurrence, like the first, was at Todos Santos, where, on July 23, 1924, I 

 secured an adult female which is now in my collection at the Los Angeles County 

 Museum, Los Angeles. The taking of these two birds, in the winter and sum- 

 mer of two successive years, would indicate that the species is of more or less 

 regular occurrence in the Cape Region of Lower California. The capture of a 

 specimen in July suggests the possibility of breeding at the point of record. 



Nothing more seems to have been heard of the species since. And 

 we know nothing of its habits. 



DISTRIBUTION 



Range. — Socorro Island and the Cape region of Baja California. 



Breeding range. — The Socorro warbler is known to breed only on 

 Socorro Island, where it is resident. It has been found in the breed- 

 ing season near Todos Santos, Baja California. 



This warbler has been found in winter in two localities (Todos 

 Santos and El Oro) in Baja California, and appears to be resident in 

 small numbers. 



PEUCEDRAMUS TAENIATUS ARIZONAE Miller and Griscom 



NORTHERN OLIVE WARBLER 



Plate 23 



HABITS 



The olive warbler was long classed as a species of Dendroica^ with 

 Peucedramus regarded as a subgenus, but it is now properly placed in 

 a genus by itself, for as Dr. Chapman (1907) points out it differs from 

 Dendroica chiefly "in its slenderer, more rounded bill, proportionately 

 longer wings (about 1.00 inch longer than the tail) and decidedly 

 forked tail, the central tail feathers being more than .25 inches shorter 

 than the other ones. In general color and pattern of coloration 

 Peucedramus is markedly unlike Dendroica, from all the species of 

 which the male differs in requiring two years to acquire adult plum- 

 age." 



For a still longer time it was supposed to be a homogeneous species, 

 until Miller and Griscom (1925) made a study of it and divided the 

 species into five subspecies, mostly Mexican and Central American. 

 In giving this bird the name P. t. arisonae, they state that it is entirely 

 different in coloration from the type race ; "upperj)arts plain mouse- 

 gray, in spring plumage almost never tinged with olivaceous, even on 

 the upper tail-coverts, appearing lighter and grayer than typical 



