184 BULLETIN 203, UNITED STATES NATIONAL MUSEUM 



eggs were in it, and would probably have been hatched by the Warbler 

 with her own." 



As evidence of the late migration of this subspecies, Eobie W. Tufts 

 writes to me from Nova Scotia : "The latest date of departure which 

 appears to be normal is October 7, 1936, though they generally leave 

 during the second week of September. On November 25, 1929, a 

 female was collected by me at Wolf ville. The bird was searching for 

 food very actively and its general behavior was decidedly abnormal. 

 The bird's body showed slight traces of emaciation." Birds that have 

 been recorded in Massachusetts as late as September 30, long after our 

 local breeding birds have left, were probably of this subspecies. 



DENDROICA PETECHIA KUBIGINOSA (Pallas) 



ALASKA YELLOW WARBLER 



HABITS 



This subspecies was formerly supposed to range throughout most 

 of Alaska, but its breeding range is now understood to be restricted 

 to the coast region of southern Alaska and British Columbia, from 

 Kodiak Island (the type locality) southward to Vancouver Island. 

 It migrates through California to Mexico and Central America, and 

 probably spends the winter in South America. In El Salvador, ac- 

 cording to Dickey and van Kossem (1938), "this race was found only 

 as a fairly common spring migrant through the upper levels of the 

 Arid Lower Tropical. As with D. p. aestiva the winter range un- 

 doubtedly lies farther to the south. It is notable that ruhiginosa 

 occurs at somewhat higher elevation than the other three forms and 

 was not found at all in the 'tierra caliente.' " This race has been 

 reported in Kansas and in central Texas, but these birds may have 

 been amnicola^ which somewhat resembles ruhiginosa and which had 

 not been accepted at that time. 



Ridgway (1902) describes the Alaska yellow warbler as "similar to 

 D. ae. aestiva^ but slightly smaller and much duller in color. Adult 

 male darker and duller olive-green above, the pileum concolor with 

 the back or else becoming slightly more yellowish on forehead (very 

 rarely distinctly yellowish on forehead and fore part of crown) ; 

 wing-edgings less conspicuous, mostly yellowish olive-green, some- 

 times inclining to yellow on greater coverts. Adult female darker 

 and duller olive-greenish above, duller yellow below." He might have 

 added that the chestnut streaks on the breast are narrower than in 

 aestiva. 



Nothing seems to have been published on the nest and eggs of the 

 Alaska yellow warbler, nor on its habits, all of which probably do 

 not differ materially from those of the species elsewhere in similar 

 environment. 



