196 
NUMBERS OF PRINCIPAL BIRDS 
oF NORTHERN ILLINOIS, 
SUMMERS OF 1907 AND 1909 
(15 SPECIES) 
(84.4 PER CENT. OF ALL THE BIRDS SEEN) 
HME MSH ISPALLOW: selciacieiaicitetaer tere semen 2993 
Bronzed exracklews cracls nto scree syererse aca roe 1970 
WS ODO ey oe tae is sda ala ietrnie aces tanatemusveretet one 743 
Mead Owilanict me ivsjeeeicrerarcievete cetera eieieine ire 536 
Prairie, Horned! Wark: (etic isecueleve seine 451 
Red-winged blackbird ................. 417 
TOKEN Liavane ovecagensanvs ouehcamtont vegsvoe enneretatere era 350 
RODE Tiers oie at stops, sgens: 3 sa nlateay ear aes eel erect eats 276 
American golofineh) <i.).)s cin cise «nite 257 
Mourning, ove a icctis is aiceecsiere c sieinntelere 206 
(ChONiG “oe eapoSennpob UDO Loto rho pti t 197 
Barn Jswallows sciceuctastes gisvattenoes ie ores 160 
VESPER ISPATTOW <cctere clare cusiecoromceuateetens 151 
Grasshopper sparrow .........-...s.e- 151 
DickCigsel.i< Mates steveriereicise oie ordre sceetce 149 
MOtal’: $5 siaettad veitiere ts te cls eraieistaemairete 9007 
author in 1907 to 1912 when he was state entomologist of Illinois. In 
an article on the subject published in the Twenty-ninth Report of that 
office* is a tabulation of the distribution by sections of the state of 
114,493 specimens of thirty-four species of May-beetles (Phyllophaga), 
from which it appears that, with these insects also, the number of domi- 
nant species is greatest in southern IIlinois, where 8 out of 30 species 
make up 85 per cent. of the total number taken; smallest in central 
Illinois, where 3 of 28 species made up 81.7 per cent., and 4 species 
made 91 per cent.; and intermediate to these in the northern part of 
the state, where 5 of 21 species made up 85 per cent. of the whole 
number taken. The average number of each dominant species differs, 
of course, in the same direction. In southern Illinois the eight most 
abundant May-beetles were represented by an average number of 2959 
specimens each and the remaining 22 by only 103 each. In central IIli- 
nois the corresponding numbers were 17,952 each for the four common- 
est species and 291 each for the 24 others, and in northern Illinois they 
were 2619 each for five of the species and 112 each for the remaining 21. 
THE MosT ABUNDANT SPECIES OF THE WHOLE STATE 
By uniting into one the three preceding lists and filling in the 
numbers of each species in all the columns for the sections of the state, 
we make up the following table, in which it is easy to distinguish the 
eleven principal species for the whole state. This comprises all whose 
numbers are larger than 500, and the twenty-nine species of this table 
* A General Survey of the May-beetles (Phyllophaga) of Illinois, by S. A. Forbes, 
State Entomologist, p. 23-70. 
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