16S Bulletin Wisconsin Natural History Society [Yol. 13. No. 3 
Composthlypis americana americana (Linnaeus). Parula War- 
bler. 
Common only in the thicker portions of zone six. and only for 
a couple of days during the spring migration. 
Dendroica tigrina (Gmelin). Cape May Warbler. 
Never a very common species, though usually in evidence at 
about the height of the warbler migration — May 5. Usually 
remains high in the tangle of zone six. 
Dendroica aestiva aestiva (Gmelin). Yellow Warbler. 
Abundant during the spring migration, and common as a 
breeding species. Finds its optimun in zone six, but is also 
common in the hazel ( Corylus rostrata) ‘‘islands’’ of zone eight. 
Dendroica caerulescens caerulescens (Gmelin). Black-throated 
Blue Warbler. 
Common on both spring and fall migrations in the swamp, 
especially on zone six. Two males shot had fed largely on 
midges, together with some small lepidopterous insects. 
Dendroica coronata (Linnaeus). Myrtle Warbler. 
The first of the warblers to appear, being over five weeks 
ahead of the main warbler migration. Common in zone seven 
(outer), and six, in which it breeds. 
Dendroica magnolia (Wilson). Magnolia Warbler. 
Common in the outer border of zone seven, and in zone six 
during the migration, and also seen in some numbers in the fall. 
Dendroica pennsylvanica (Linnaeus). Chestnut-sided Warbler. 
Common in the sixth zone for a few days on the spring, migra- 
tion. Remains usually between eight and twelve feet above 
the ground. 
Dendroica castanea f Wilson). Bay-breasted Warbler. 
Distribution and habits almost identical with the preceding 
species. 
Dendroica striata (J. R. Forster). Black-poll Warbler. 
Common in both areas of zone seven; the last of the warblers 
to arrive, and ordinarily confines itself to the taller trees, espe- 
cially oaks, from whose rough bark it obtains an adequate sup- 
ply of insects. 
Dendroica fusca ( Muller). Blackburnian Warbler. 
Of very irregular occurrence: during the spring of 1914 not a 
single individual was found within the formation, while in 1915 
the woods were fairly alive with the species on both May 4 and 5. 
