429 
On the much smaller area of southern Illinois surveyed October 
21 to November 16 (acreage for central Illinois 4623.7, for southern 
Illinois 1763.42), but 56 species were listed (3979 birds) the following 
13 of which were needed to include 85% of the whole number. 
NUMBERS OF THE More ABUNDANT Brirps or SourTHERN ILLINOIS, FALL or 1906 
(OcroBerR 31 To NoveMBER 16) 85% List 
Bronzed grackle 862 Prairie horned lark 104 
Slate-colored junco 624 Goldfinch 97 
Robin 393 Song sparrow 85 
Crow 380 Bluebird 84 
Quail . 365 English sparrow 73 
White-throated sparrow 156 ~=Pipit 68 
Meadowlark 128 
English sparrows, it will be seen; contributed less than 2% to the 
total. The 15 more abundant species averaged 263 each, and the re- 
maining 43 species 13 each. The above list differs from that of central 
Illinois for September and October by the dropping of seven species 
and the addition of the song sparrow, and in the order of abundance of 
the numbers of birds the several species common to the lists, of course, 
differ widely. The most notable difference is in the numbers of the 
English sparrow, which drops from the head of the list in central Illi- 
nois to the next to the last place on that for southern Illinois. The junco, 
robin, and quail were especially more abundant southward, but the gen- 
éral composition of the two lists is fairly similar. 
Fart Birps IN Hapirats 
The relation of birds to special features of their environment during 
the migration period, characterized as this is by a breaking of the ties 
which have held the birds to their local habitats during summer or winter, 
is necessarily of relatively little moment except as it may tend to show 
a persistence of features of their habitat choices which even the aban- 
donment of their previous homes in a search for new situations can not 
wholly dissolve. It may be, also, that the exigencies of migration in- 
volve different demands and hence different habitat resorts from those 
of a settled and relatively solitary life. 
Certainly our tabulation of the numbers of birds per square mile 
in the several habitats of central Illinois in autumn gives color to this 
latter supposition. Among all the situations offered by the open fields, 
the pasture contained more than twice as many birds to the mile as any 
other, notwithstanding the fact that its total area was next to the largest 
on the list. Only corn surpassed it in area, and pastures contained two 
and a half times as many birds to the mile as corn. 
