52 PLANT-BUGS INJURIOUS TO COTTON BOLLS. 
Table XXIII. — Abundance of Pentatomids, Zaragoza B, July 25, 1905. 
Tabla. 
Number 
of plants 
in row. 
Percent- 
age of 
plants 
infested. 
Number of 
adults P. 
ligata per 
row. 
Number of 
adults P. 
sayi and 
Thyantasp. 
per row. 
Number of 
adult Pen- 
tatomids 
per 100 
plants. 
Number of 
nymphs P. 
ligata per 
row. a 
Egg- 
batches 
P. ligata. 
1 
310 
227 
247 
232 
254 
270 
314 
213 
209 
6.4 
1.3 
1.6 
2.1 
3.1 
3.3 
6.0 
6.1 
3.8 
30 
4 
4 
11 
10 
16 
43 
21 
25 
62 

c2 
c2 
cl 


b2 

10. 3 
1.8 
2.4 
5.6 
4.3 
5.9 
13.7 
9.6 
11.9 
112 
12 







1 
2 
1 






2 
3 
4 
5 
6... 
8 
9... 
Total 
Average. . 
2,276 
255 
164 
18.2 
9 
1 
65.5 
7.3 
12 2 
1.33 
4 
.44 
3.7 
a Small figures indicate the instars. b Thyanta sp. c Puifatoma sayi. 
Table XXIV. — Abundance of Pentatomids, Zaragoza B, August 1, 1905. 
Tabla. 
Number of 
plants in 
row. 
Percentage 
of plants 
infested. 
Number of 
adults of 
P. ligata 
per row. 
Number of 
adults 
(Table XXIII) 
P. sayi and 
Thyanta per 
row. 
Number of 
adult Pen- 
tatomids 
per 100 
plants. 
Number of 
nymphs 
P. ligata 
per row.a 
1 
301 
236 
265 
308 
303 
275 
371 
232 
170 
3.0 
2.1 
1.1 
1.0 
3.9 
1.1 
.5 
4.3 
1.1 
13 
6 
3 
3 
10 
3 
2 
18 
3 




2 




4.3 
2.5 
1.1 
1.0 
4.0 
1.1 
.5 
7.7 
1.8 
12 
1= 
13 
13 1 ^ 
2i 1* 


25 2 1 

2 . 
3 
4 
5 
6. . 
7. . 
8 
9 
Total 
Average. . 
2,461 
273.4 
61 
6.8* 
2 
0.2 
24.0 
2. 7 
33 1 
3. (') 0. 1 
2.0 
a Small figures indicate the instars. 
The observations in Zaragoza B were made partly as a check on 
those made in Ceceda A, tabla 14. In the latter block a large per- 
centage of the bolls had already been ruined and probably rendered 
less attractive as food for the bugs. There seemed to be a possibility 
that the decrease in numbers during the last 10 days of July was due 
to migration of the adults to other fields. In Zaragoza B, tablas 1-9, 
the cotton was in such condition on the average that it is improb- 
able that a scarcity of suitable food supply could have impelled a 
migration. The data, moreover, on the numbers of eggs and nymphs 
found in the different tablas give strong indications that the infesta- 
tion had progressed from tabla 1 toward 9 and that it had been, on the 
whole, recent. If the decrease in numbers of the adult conchuelas and 
other species of Pentatomids in Ceceda A, tabla 14, had been due to a 
migration, a similar decrease would have been unlikely to have 
occurred in the planta cotton in Zaragoza where the food supply was 
ample. The planta cotton in Ceceda A, tabla 16, separated from 
