1889. ] Faxon, Summer Birds of Berkshire County, Mass. 103 
found it again in the latter part of the following month. Mr. William 
Brewster * detected it in a white spruce and larch swamp in Anticosti, 
July 11, 1881, and he informs me that at Lake Umbagog he has generally 
observed it during the breeding season in larch swamps, but sometimes 
on mountain sides—always among coniferous trees. Dr. C. H. Mer- 
riamf states that in the Adirondack region, where it breeds, it generally 
prefers hard-wood areas, and Mr. J. A. Allen{ reports it as not uncom- 
mon toward the middle of July, near Denison, Iowa, ‘‘in low groves of 
bur- and other oaks.” 
51. Compsothlypis americana. BLUE YELLOW-BACKED WARBLER.— 
Very rare. I identified only one specimen, high up on the wall of the 
Hopper, about 2000 feet above the sea-level. ; 
52. Dendroica estiva. YELLOW WARBLER. Seen only near the vil- 
lage of North Adams. But it must be borne in mind that I spent very 
little time in the lower country of Northern Berkshire. 
53- Dendroica cerulescens. BLACK-THROATED BLUE WARBLER.— 
Quite common on the mountains up to at least 3000 feet. Prefers woods 
with a good share of deciduous trees, maple, birch, beech, oak, etc. 
Among the innumerable specimens seen, but two were females. 
54. Dendroicacoronata. YELLOW-RUMPED WARBLER.—NOt rare in the 
black spruces on Graylock from about 2800 feet to summit. One with a 
quick ear for the song might count on finding three or four specimens dur- 
ing a day spent on the mountain. I believe the only other record of this 
bird in Massachusetts during the breeding period is Winchendon, Wor- 
cester County (Brewster, Awk, V, 391, Oct., 1888). 
55. Dendroica maculosa. BLACK-AND-YELLOW WARBLER.—Common. 
Noted from about 1000 to 2200 feet. Prefers somewhat open country with 
a second growth of spruce. Hence, although belonging to the Canadian 
fauna more strictly than the Canadian Warbler, it is not so common at 
high levels as the latter. 
56. Dendroica pensylvanica. CHESTNUT-SIDED WARBLER.—Common 
in the mountain valleys, and extending well up on the sides of the 
mountains. 
57- Dendroica blackburnie. BLACKBURNIAN WARBLER.—Commorn on 
the Saddle-Back range from the Notch nearly to the summit of Graylock. 
On the Graylock carriage road D. blackburnie and D. virens are the 
commonest of the Warblers. 
58. Dendroica virens. BLACK-THROATED GREEN WARBLER.—Com- 
mon. Distribution similar to that of D. blackburnie. 
59. Seiurus aurocapillus. GOoLDEN-CkOWNED THRUSH. —- Common. 
Found nearly to the summit of Graylock. 
60. Geothlypis philadelphia. Mourninc WARBLER. — Common. 
‘Noted ataltitudes from 1000 to 3500 feet, one pair at least being established 
* Proc. Boston Soc. Nat. Hist., XX, 370. 
+ Bull. Nuttall Orn. Club, VI, 227. 
{ Mem, Boston Soc, Nat. Hist,, I, 494. 
