742 
Journal of Agricultural Research 
Vol. XXI, No. 10 
yi niile from nearest farmhouse. East, No. 3, in weeds 200 yards east of 
a farmhouse; No. 4, 100 yards from farmhouse and pens where much live 
stock is kept. South, No. 3, under tree by small grocery store at cross¬ 
roads; No. 4, in village of Elam near stores and house. The distances 
from the release point to the traps are given in Table IV. 
Tab rC IV .—Second dispersion test at Dallas, Tex. Species ami sex of marked flies 
recovered in rings of traps about point of liberation 
Trap No. 
Dis¬ 
tance 
from 
place 
of re¬ 
lease. 
Mu sea 
do- 
mestica. 
Chrys- 
omya 
inacel- 
laria. 
Phormia 
regina. 
Ojdiyra 
Icucos- 
i o 7 H a. 
Sarcofdi- 
oga. 
spp. 
Unde¬ 
ter¬ 
mined. 
Total. 
Grand 
total. 
Miles. 
d 
9 
d 
9 
d 
9 
d 
9 
d 
9 
d 
9 
d 
9 
1 W. 
1 .6 
0 
33 
10 
28 
0 
5 
0 
1 
0 
0 
0 
0 
10 
67 
77 
1 N. 
1.8 
0 
8 
3 
18 
0 
0 
0 
0 
0 
0 
0 
0 
3 
26 
29 
1 E . 
2.0 
0 
10 
8 
19 
0 
2 
0 
0 
0 
0 
0 
0 
8 
31 
39 
1 S. 
2. 0 
0 
4 
1 
3 
0 
0 
0 
1 
0 
0 
0 
0 
1 
8 
9 
Total. 
0 
55 
22 
68 
0 
7 
0 
2 
0 
0 
0 
0 
22 
132 
3 54 
3 w. : .. 
2.5 
0 
■ 2,1 
8 
18 
0 
2 
0 
0 
0 
0 
0 
T 
8 
41 
S2 
2 N. 
3.4 
0 
29 
9 
13 
0 
0 
0 
1 
0 
1 
0 
O 
9 
44 
53 
2 E... 
3 - 5 
0 
8 
1 
5 
0 
0 
0 
0 
0 
0 
0 
O 
I 
C 3 
34 
2 S. 
2.9 
0 
1 
1 
0 
0 
1 
0 
0 
0 
0 
0 
O 
I 
2 
3 
Total. 
0 
61 
19 
36 
0 
3 
0 
1 
0 
1 
0 
I 
10 
303 
122 
3 W. 
3 -o 
0 
5 
6 
25 
2 
10 
0 
2 
0 
1 
0 
O 
8 
43 
.5 3 
3 N . 
3-4 
0 
4 
4 
18 
0 
2 
0 
0 
0 
0 
O 
4 
23 
29 
3 E . 
4. 2 
0 
1 
1 
4 
0 
0 
0 
O 
0 
0 
0 
O 
1 
5 
6 
3 s. 
4.0 
0 
3 
2 
6 
0 
0 
0 
O 
0 
0 
0 
O 
2 
° 
IT 
Total. 
0 
T 3 
T.3 
53 
2 
T 2 
0 
3 
0 
T 
0 
O 
T < 
°V> 
07 
4 W. 
3 - 75 
0 
6 
O 
9 
0 
I 
0 
1 
0 
O 
0 
O 
O 
37 
37 
4 ^ . 
4.4 
0 
9 
.11 
35 
0 
O 
0 
0 
0 
O 
0 
O 
i r 
44 
55 
4 E. 
5 -o 
0 
2 
3 
5 
0 
O 
0 
0 
0 
O 
0 
O 
3 
7 
10 
4 S. 
5 -o 
0 
0 
0 
2 
0 
I 
0 
0 
0 
O 
0 
O 
0 
3 
3 
Total. 
0 
17 
14 
5 i 
0 
2 
0 
T 
0 
O 
0 
O 
M 
7 r 
85 
Grand total. ... 
0 
146 
68 
208 
2 
24 
0 
7 
0 
2 
0 
I 
7° 
388 
458 
a Ophyra aenescens Wicd. 
Since a single fly liberated at the beginning of the first test was recov¬ 
ered on July 11, it is barely possible that other marked specimens liber¬ 
ated at that time were recovered after July 12. In this discussion they 
would be considered as liberated in the second series. 
In this experiment the number of colored flies captured was very much 
less than the number caught in the first test beginning June 30. The 
total number of marked flies recovered in the different directions from 
the point of liberation was 458, as compared with 4,652 in the first test. 
It. is true that almost one-third more flies were liberated in the first test 
than in this one, but the proportion of those recovered is much smaller. 
It is also true that two of the rings of traps were much more distant from 
the point of liberation than in the first test; however, when we compare 
the catches in the two inner circles of traps in this test with the two outer 
ones in the first—positions which were the same in the two experiments— 
