8 DH Bev AUD UB O Ne) Bie ee ae 
most common species is shown in TABLE 5 and compared with the 
abundance and ranked position of last year. A concentration of Bona- 
parte’s Gulls in Lake Michigan was responsible for their total being so 
high. Chimney Swift numbers were obviously down and this change 
should be watched more closely. 
In order to show the relative abundance of various permanent resi- 
dents, summer residents and migrants at different latitudes in Illinois, 
we will continue to use the four AREAS of the state, as divided last 
year, and depicted in FIGURE 1. TABLE 6 shows the number of coun- 
ties and party-hours for each AREA. The actual counties within each 
AREA are shown graphically in FIGURE 1 and listed in TABLE 7. The 
relative abundance of selected species (same as those last year) per ten- 
party-hours (approximately one day of observation) is shown in FIG- 
URE 2. The number in parenthesis following the species name is the 
statewide average number of birds per ten-party-hours. 
Most observers and compilers submitted proper information this 
year, but a few people still have trouble computing party-miles and 
party-hours [The biggest problem came from the inclusion of hours by 
observers at bird feeders. This problem will hopefully be resolved by 
next spring. All but three county compilers used the official checklists 
provided and therefore included all the necessary data. Inadequate data 
is denoted by a question mark (?) in the tables. Next year, the official 
checklist must be used if we are to have the data computerized. 
The total county statistics appear in TABLE 7 (Col. 2 indicates the 
AREA in which each county lies; Col. 4, the total number of species; Col. 
5, the total number of birds reported; Col. 6 and 7, number of observers 
and parties, respectively; Col. 8, time of observations (in the 24-hour 
system ); Col. 9 and 10, the number of miles walked or driven, and hours 
walked and driven, respectively; Col. 11, name of county compiler. 
TABLE 8 shows comparisons of the first three statewide counts. 
TABLE 6 
Coverage Within the Four AREAS 
Possible No. No. Counties No. Ave. No. P.H.* 
AREA of Counties Participating ep ahees per County 
1 23 115287) ee AY 19.5 
2 28 201 LEG) eae D5 28.8 
3 Oa MA LGR ayy n= VASE 34.0 
4 24 23 (95.8%) 1284+ 55.8 
Total 102 770 (75a ee Bae 36.9 
* P.H. = Party Hours 
+ The Party Hours for Boone, Henderson, and Livingston 
counties have not been included. 
