1910] Grinnell—Birds: Alaska Expedition, 1908. 409 
Vermivora celata lutescens (Ridgway). Lutescent Warbler. 
This was conceded to be the commonest warbler of the region. 
It was found among alders at the head of Cordova Bay; on 
Hawkins Island; a few at the edges of the forest on Hinchin- 
brook Island; on Montague, Green, Hoodoo, and Knight islands ; 
along Port Nell Juan, where young as well as old birds were 
observed August 14; and finally at Valdez, where noted by Miss 
Alexander August 28. Of the series taken (nos. 1313-1329), 
all are breeding adults, except one (no. 1325); this is a female 
in full juvenal plumage, from Green Island, July 14. It is 
notable because of its extreme grayness, as compared with young 
of lutescens from California, the latter being decidedly greenish 
though dingy. Among the sixteen adults are three which also 
stand out conspicuously as gray birds. These are: Nos. 1315 
and 1318, both females, from head of Cordova Bay, June 11 and 
9; and no. 1323, male, from Northeast Bay, Hinchinbrook Isl- 
and, June 30. If I had only these four specimens, I would 
unhesitatingly refer the race from the Prince William Sound 
region to Vermivora celata celata, though not typical. But the 
remaining thirteen skins of the series are lutescens, either pre- 
cisely, or more nearly than anything else. My conclusion is 
that an infusion of celata blood is apparent in the series; in other 
words that birds from the Alaskan interior, where typical celata 
occurs exclusively (see Oberholser, Auk XXII, July, 1905, p. 
242), have recently invaded the coast belt at this point, and 
interbred with lutescens. The descendants are variously inter- 
mediate, and are therefore in the category of hybrids, and not 
intergradients. If all the birds from any one locality were 
uniform in their characters, and the series from the various 
localities aligned themselves as steps from one extreme to the 
other, I would choose to call them intergradients. But this is 
not the case, as typical lwtescens was taken at the same places 
(except on Green Island, where only the one juvenal was se- 
cured) as the celata-like individuals. 
