Voi.xxxvn 



1919 J Obeeholser, Notes on North American Birds. 407 



Acanthopneuste borealis kennicotti (Baird). 



The Kennicott Willow Warbler, Acanthopneuste borealis kenni- 

 cotti, originally described by Professor Baird 1 and subsequently 

 revived by Mr. Ridgway, 2 has for some unaccountable reason not 

 been currently recognized. It is undoubtedly a good subspecies, 

 differing from Acanthopneuste borealis borealis in its much smaller 

 size, particularly of wing, tail, and bill, and in its somewhat less 

 yellowish, more grayish upper parts, particularly at the spring 

 and summer seasons. It should, therefore, be restored to a place 

 in our North American list. It breeds in middle and western Alaska 

 and migrates to parts of southeastern Asia. 



Salpinctes obsoletus guadeloupensis Ridgway. 



The Guadalupe Rock Wren, Salpinctes guadeloupensis Ridgway, 

 was originally described as a subspecies of Salpinctes obsoletus, 

 but is commonly considered a distinct species. Mr. Ridgway has, 

 however, within recent years 3 again reduced it to a subspecies of 

 Salpinctes obsoletus, though this seems to have been ignored by 

 present day writers. The study of a series of some 190 specimens 

 of Salpinctes obsoletus and 25 of Salpinctes guadeloupensis unques- 

 tionably substantiates Mr. Ridgway 's opinion in regard to their 

 subspecific relationship. All the measurements of these two birds 

 fully inosculate, as may be readily seen from the detailed figures 

 that Mr. Ridgway has given. 4 In color the two birds look very 

 different at first sight, but there not infrequently occur examples 

 •that completely bridge over the differences in coloration. In fact, 

 the most deeply colored specimens of Salpinctes obsoletus obsoletus are 

 really darker than the lightest examples of Salpinctes guadeloupensis. 

 Moreover, Salpinctes obsoletus neglectus, which is an undoubted sub- 

 species of Salpinctes obsoletus, is, in the shade of the upper surface, 



1 Phyllopneusle kennicotti Baird, Trans. Chicago Acad. Sci., I, 1869, p. 313, pi. 30, fig. 2. 

 (St. Michael, Alaska). 



2 Bull. U. S. Nat. Mus., No. 50, part III, 1904, p. 696. 



3 Bull. U. S. Nat. Mus., No. 50, part III, 1904, p. 650. 



4 Bull. U. S. Nat. Mus., No. 50, part III, 1904, pp. 645, 646, 650. 



