152 
scattered through the open fields, at a distance from the food plants 
of the beetles, the ratio of males to females was precisely twice as 
great during the last half of the period as during the first. Slinger- 
land's data, already referred to, do not support the supposition of 
a relatively early death of the males. It seems likely, consequently, 
that females may require repeated fertilization, especially as the 
eggs are laid gradually, a few at a time. 
Coi,I,KCTIONS OF LaCHNOSTERNA FROM TrEES, UrBANA, 1906. 
Itnplicital 
Fusca 1 
Gibbosa 1 
Rug-osa 1 
Ilicis 1 
Hirticula 
Inversa 
Tristis 
o 
!0 
4) 
1} 
4) 
OJ 
D 
4) 
H 
2 
a; 
o 
rt 
2 
s 
2 
a 
s 
2 
5 
B 
fa 
2 
ci 
B 
<u 
15 
s 
fa 
May 14 
59 
90 
3 
1 
May 15 
V4 
95 
8 
2 
May 16 
27 
52 
5 
3 
May 17 
1U9 
2UU 
1 
May 21 
24 
23 
1 
May 22 ... . 
May 23 
19 
25 
10 
1 
193 
239 
7 
7 
8 
2 
3 
14 
5 
2 
1 
May 24 
25 
26 
2 
5 
1 
2 
2 
May 25 
31 
35 
May 26 
104 
135 
5 
4 
4 
1 
13 
9 
3 
1 
1 
1 
May 30 
4 
25 
b 
5 
1 
2 
May 31 
June 1 
50 
108 
17 
2 
28 
24 
45 
21 
6 
.5 
24 
125 
4 
3 
12 
6 
3 
1 
June 2 
45 
129 
8 
8 
12 
4 
June 4 
14 
96 
19 
14 
5 
16 
3 
1 
June 5. . , . . 
6 
54 
1 
24 
24 
12 
20 
1 
3 
June 6 
4 
36 
15 
2 
3 
8 
12 
3 
6 
3 
June 7 
1 
9 
20 
16 
4 
17 
12 
5 
7 
7 
June 9 
o 
41 
14 
16 
15 
8 
6 
4 
June 15 
4 
27 
7 
13 
21 
39 
8 
12 
June 16 
17 
13 
17 
4 
1 
1 
2 
June 18 
12 
76 
13 
37 
16 
2 
3 
1 
June 21 
16 
7 
22 
1 
June 22 
3 
3 
4 
1 
June 25 
1 
June 28 
1 
1 
Totals 
Males 
834 
29 
79 
66 
196 
136 
3 
14 
Females.. 
1683 
17 
23 
134 
145 
106 
3 
11 
