316 BIRDS OF THE NEW YORK CITY REGION 



Lake, Morris County (Miller), Cranberry Lake (Griscom) and 

 Boonton (Carter); apparently absent along the Delaware River. 

 Elsewhere a strangely rare transient. 



ENGLEWOOD REGION. Rare transient; May 4 (Weber) 



to May 16, 1920 (Granger, Griscom, Janvrin); July 22, 1913 



(Weber) to September 4 (Weber). 



BREWSTER'S WARBLER (Vermivora leucobronchialis) 



LAWRENCE'S WARBLER (Vermivora lawrencei) 

 For many years the status of these two birds was in doubt, 

 but it is now generally accepted that they are fertile hybrids 

 of the two last species. Naturally they are much rarer birds 

 than their parents, and Lawrence's Warbler, the recessive, is 

 very much rarer than Brewster's. They are produced where 

 the ranges of the parents overlap, as in West Chester County 

 and parts of New Jersey, such as Boonton and the Wyanokie 

 hills. As a result our region is particularly favorable for 

 them, and the immediate vicinity of New York City is one of 

 the best places to find them as transients. The more extended 

 observation of recent years shows that either hybrid is likely 

 to be observed during the spring migration in most parts of 

 our territory, and both have been found breeding. There is 

 no longer any point in recording such transients, but breeding 

 birds should be carefully watched and their progeny 

 determined if possible. 



Long Island. As is to be expected both hybrids are very rare 

 transients, and neither has been found breeding. Brewster's has 

 been found twice, and Lawrence's four times. 



MASTIC. Brewster's Warbler, August 25, 1918; Lawrence's 

 Warbler, May 18 and June 13, 1920. 



New York State. Brewster's Warbler has been observed in the 

 breeding season at Ossining (Fisher), and a total of six specimens 

 taken. Lawrence's Warbler has been recorded from Rye and Staten 

 Island, and was found breeding in Bronx Park in 1903, and the 

 next May another returned but did not remain. In the last few 

 years I have received several reports of Lawrence's Warbler from 

 Van Cortlandt Park and Mount Vernon, and in June, 1922 it was 

 found breeding near Briarcliff Manor (Gerald H. Thayer). 



