BIRDS IN RELATION TO THE ALFALFA WEEVIL. 
51 
progressed probably would be manifest. The largest amount eaten 
by any was by a nestling 3 or 4 days old, which had 13 larvae and 
14 adults in its stomach. Orthoptera (grasshoppers and crickets) 
continued to increase and in this series of stomachs comprised nearly 
a quarter (24.71 per cent) of the total contents, being eaten by 20 
of the 35 birds. Ground beetles, Hemiptera, Lepidoptera, and 
Hymenoptera, made up the bulk of the remainder. The vegetable 
food, practically all grain, amounted to 58.20 per cent. 
MAY 1-15 
MAY 16-31 
JUNE 1-15 
JUNE 16-30 
JULY .1-15 
EXPLANATION 
JULY 16—31 
GRASS- 
CAT£RWZ.LA#S G&4/M 
cm 
M/SC£LLAM£OVS 
Fig. 2. — Diagram showing the food of young English sparrows during semimonthly periods 
in May, June, and July. 
The diagram presented in figure 2 and the following tabulation 
represent each of the six semimonthly periods from the first of May 
to the end of July, and the proportions of the various food elements 
may easily be seen by comparing the various sectors of the different 
circles : 
Semimonthly periods. 
Alfalfa 
weevils. 
Grass- 
hoppers. 
Caterpil- 
lars. 
Grain. 
Miscella- 
Mayl-15., 
May 16-31. 
June 1-15. 
June 16-30 
July 1-15.. 
July 16-31. 
14.00 
36.12 
26.75 
18.25 
.77 
9.20 
0.94 
.66 
1.03 
16.30 
35.23 
24.71 
4.19 
18.36 
11.30 
19.64 
8.82 
1.86 
65.62 
25.05 
38.84 
36.64 
51.83 
58.20 
15.25 
19.81 
22.08 
9.17 
3.35 
6.03 
