425 
paign to Downs in McLean county, September 4 to 7, from Champaign 
Mississippi River, September 17 to October 17, and for short distances 
about Urbana, September 12 to 15 and October 23 to 26. In southern 
Illinois a single trip was made from Cairo northward to Pana. The area 
surveyed in these periods was 5,890.58 acres, of which 70 per cent. was 
in central Illinois. On this entire area 9,387 birds were recognized and 
counted (1020 to the square mile), 5.408 of them in central Illinois, 
and 3,979 in southern. The number per square mile in central Illinois 
was only two-thirds of that in southern (883 to 1467), a difference at 
least partially attributable, no doubt, to the later period of the southern 
observations and the concentration there of birds in the act of migration. 
The percents of permanent and winter resident species, taken to- 
gether, were in early November about three times as large in southern Illi- 
nois as in central in September and October, and those of the summer and 
migrant species were about three times as large in central Illinois as in 
southern. In numbers of native birds the permanent and winter residents 
together were nearly twice as abundant south as north, and the summer 
residents and migrants were about twice as abundant north as south. 
The great predominance of English sparrows in central Illinois, as 
compared with southern, obscures the contrast in the numbers of the 
table of all birds by its over-weight of permanent residents in the cen- 
tral section. 
. 
RESIDENCE CLASSIFICATION, FALL, CENTRAL ILLINOIS, AUGUST 28 
To OcroBErR 26, 1906 
NUMBERS AND PER CENTS, OF SPECIES 
Permanent Winter Summer Migrants All 
Numbers 21 6 aye 24 102 
Per cent. 20.6 5.9 50.0 23.0 100 
NUMBERS AND PER CENTS OF ALL BIRDS 
Permanent Winter Summer Migrants’ All 
Numbers 3367 270 2161 553 6351 
Per cent. 53.0 4.3 34.0 8.7 100 
t NUMBERS AND PER CENTS OF NATIVE BIRDS 
Permanent Winter Summer Migrants All 
Numbers P2Go ue os 270 2161 553. 4247 
Per cent. 29.7 6.4 50.9 13.0 100 
RESIDENCE CLASSIFICATION, Fatt, SOUTHERN ILLINOIS, OCTOBER 
31 To NOveMBER 16 
NUMBERS AND PER CENTS OF SPECIES 
Permanent Winter Summer Migrants All 
Numbers 32 9 8 56 
=< 
7 
Per cent. 57.2 16.1 14.2 12.5 100 
across the state by way of Decatur and Jacksonville to Quincy on the 
wo 
