Brewster Warbler in (Jhio. 69 



yellow on the underparts. The black eye stripe is narrow. 

 Of the two specimens collected one has no yellow on the 

 back, except the yellowish white wing bands, and just a 

 trace of yellow on the breast, the other one has evident 

 yellow in the middle of the back and on the breast. 



All four of these birds were singing males with no appar- 

 ent family ties. If they mate and remain in the region to 

 nest a report will be made later. 



In habits of feeding and singing, these four individuals re- 

 semble the Blue-wing more than the Golden-wing, but are 

 found in the same parts of the woods. It may be significant 

 that they have been found only in the two woods in which 

 the Golden-wing was found last season. While no careful 

 iior systematic search was made for nesting Golden-wings, 

 none were found in the course of regular class study, while 

 the Blue-wings were much in evidence in the same woods. 



The presence of one individual of this rare hybrid would 

 not excite any great wonder, since it is likely to occur wher- 

 ever the Golden-wing may breed, but the presence of four, 

 and probably more, individuals seems to demand some ex- 

 planation. The only light I am able to throw upon it is 

 that in the woods where three of the four were found we 

 last year found what we then supposed to be a pair of typ- 

 ical Golden-wings nesting, but as no nest could be found, 

 and the pair soon deserted the region, they were supposed 

 to have gone elsewhere. In the light of the present experi- 

 ■ences I am strongly inclined to the opinion that the female 

 of this pair was of the Brewster form, since she lacked the 

 black throat and was strongly tinted with yellow above and 

 below. It may well be that this pair succeeded in raising a 

 brood in this woods, and that the birds which returned are 

 their offspring; else why so many.' 



