6 T HE A. U D.U BOONW BU Del hea 
Christmas) Census =iiay 
Tabulated by PAUL H. LOBIK 
AN ERROR IN THE TABLE: This year we must admit to an error in our 
tabulation of the Christmas Bird Census for Illinois. There simply was not 
enough room to print the total number of Mallards reported from two areas. 
The count for Mallards under “Princeton” should be 500,000, not 50,000; 
and under ‘‘Seaton” should be 155,600, not 15,560. Our table can expand 
no further. The total at the right of the table for “Mallards” should be 
657,637, not 67,597. Similarly, the complete ‘Total Individuals” at the end 
of the table should be 739,928, rather than 149,888. 
This gives us something serious to think about. After five years of tabu- 
lating our censuses, we find that the numbers of birds, with Mallards 
omitted, has leveled off at about 82,500. The number of species has gone 
down slightly (from 119 to 110). This variation in numbers is not espe- 
cially great, and the physical limits of our table definitely have been reached. 
Your Editor now feels that the tabulation is not worth continuing. It re- 
quires an excessive amount of time; no one else has come forward to do 
the job; the findings are no more than anyone could obtain from individual 
reports by a little digging. Hence we plan to drop the tabulation next year, 
and go back to the system of listing each report in detail. If you have any 
great objections to this, please write to the Editor. 
Once again, we note with regret that the Prairie Chicken is absent from 
our Census. So are the Goshawk, the Wilson’s Snipe, the Loon, the Green- 
winged Teal, and the Snow Bunting. We are pleased to see the Wood Duck 
back on the list, as well as the Brown Thrasher and ‘both species of Cross- 
bills. Probably the most unusual report was that of Gray (Hungarian) 
Partridges at White Pines State Park. 
As before, we have included separate reports from several areas which 
have been omitted from the table because of a lack of room. The counts for 
Clinton, Glen Ellyn, Jasper-Pulaski and Michigan City are given 
at the end of this write-up. As usual, the code names of the sum- 
maries that follow are the same as the names at the top of the table on 
pages 8 and 9. Please note that the order of listing of each species has been 
revised in accordance with the Fifth Edition of the Check-List of North 
American Birds, published in 1957 by the American Ornithologists’ Union. 
Also, common names of all birds have been revised to agree with the official 
A.O.U. nomenclature, except for a few in parentheses. Now for the reports: 
CODE: Arboretum, Lisle, DuPage County; entire 800 acres of Morton 
Arboretum, the Saganashkee Slough and forest preserve to its north, and 
Bemis Woods forest preserve (in Cook County) — same as last year. Semi- 
open area 15%; open fields and farm land 10%; oak woods 35%; pine and 
spruce stands 30%, river bottom 10%. Dee. 29; 7:30 a.m. to 4:30 p.m. 
Sunny first hour, overcast balance of day; temp. 20° to 28°; wind, North, 
about 3 m.p.h.; ground covered with snow, 1 inch to 4 inches deep, crusty 
from recent sleet storm. 29 observers in 6 parties. Total party-hours, 34 
(25 on foot, 9 by car). total party-miles, 58 (23 on foot, 35 by car). — 
Chicago Ornithological Society members and guests: Kenneth Anglemire, 
Bertha Bannert, Karl Bartel, L. C. Binford, Catherine Campbell, Charles 
