1915] 
Cahn: Ecology of Wingra Springs Region 
.71 
Polioptila caerulae caerulea (Linnaeus). Gnatcatcher. 
Two individuals were seen in the woods, and the species must 
be considered as rather uncommon in the formation. 
Hylocichla mustelina (Gmelin). Wood Thrush. 
A common summer resident and breeding species in zone 
seven, rarely even appearing at the outer border of the zone. 
Prefers maple as the nesting tree, as six out of seven nests found 
were in small trees of this kind. 
Hylocichla fuscescens fuscescens (Stephens). Veery. 
A rather rare migrant in. zone seven; usually silent during its 
brief stay, and there are but two records of it. 
Hylocichla aliciae aliciae (Baird). Gray-cheeked Thrush. 
A common migrant both in spring and fall along the border 
of zone seven. 
Hylocichla ustulata swainsoni (Tschusi) . Olive-backed Thrush. 
Not quite as common as the preceding species, but still not un- 
common in the outer area of the same zone. Seems to prefer 
the outer edge of the woods a little more than the gray-cheeked 
species. 
Hylocichla guttata pallasi (Cabanis). Hermit Thrush. 
Abundant in the early spring and in the fall on the migrations. 
A .bird typically of the woods, but which is not adverse to appear- 
ing on occasion in zone six. 
Planesticus migratorius migratorius (Linnaeus). Robin. 
Of rather wide and diverse distribution, being found in zones 
five to eight inclusive, but reaching its optimum in the border 
area of the woods. Robins are not found in the Madison region 
during the winter as a rule, but the species winters regularly, 
apparently, within the formation under discussion. During the 
winter the . species is to be found in the immediate vicinity 
of the springs, and the birds have been seen picking the aquatic 
forms (amphipods, isopods, etc.) from the stones in the running 
water. As the species was to be found in no other locality during 
the winter, it may be assumed for lack of more definite informa- 
tion, that the open water has much to do with the presence of 
the species in the region during the winter. 
Sialia sialis sialis (Linnaeus). Bluebird. 
Common in zone eight, and occasionally seen in zone six. 
In the former zone the species breeds wherever suitable facilities 
are found. 
