36 
Table YII— Continued. 
Neuroptera. 
Lamp. 
Chrysopa. 
Total. 
1 
2 
3 
1 
1 
1 
1 
Total for all.... 
2 
OrtJioptera. 
Lamp. Mantis. 
(Ecanthus. 
Locus tidse. 
Total. 
i 
1 1 
2 1 
3 1 2 
2 ! 
2 
5 
3 
2 
10 
Total for all 
The above results show that the direct benefit to cotton plants, so far 
as known, is very small. At the same time such beneficial insects as 
the Ichneumonids, predaceous beetles, and the Praying Mantis arede- 
stroyed, and if trapping be systematically followed up the loss may in- 
deed be considered greater than the gain. 
These experiments led to the belief that the lights used were not bril- 
liant enough for the intended purpose. Accordingly, an electric lamp 
was rented. The lamp is provided with a round burner and the flame 
produced is about 5 inches in circumference. When the chimney is 
placed over the flame the lamp is said to give a light equal to 100 can- 
dles. Experiments with this lamp in connection with the others were 
continued in the cotton fields during September. On the evening of the 
13th both kinds were placed out. The night proved to be a damp cold 
one, and the dew fell early in the evening. As a result no Boll Worm 
moths and but few insects of any kind were trapped. Of this small 
number the parasitic Hymenoptera and predaceous beetles were greatly 
in the majority. The insects caught were such as are easily attracted 
to lights, and were quite equally distributed between the three lamps 
(two beer-bottle ones and the other the electric lamp). A rainy season 
began at this time and coutinued so that no further experiments with 
lamps could be made until October 4. At this time the electric lamp 
was placed in a cotton field to determine what would be the nature of 
the catch. Heliothids had been seen flying about in the evening while 
making some other observations, but none were captured by the lamp 
at night. The other insects trapped were about the same in kind as 
those already tabulated for September 9, only that the quantity cap- 
tured by the electric latnp was about equal to that of all three of the 
others, and it had only been left burning until 10 o'clock. 
October 20 the lamps were again placed out, this time one in a patch 
of cowpeas and the other some distance away in a small patch of corn 
which had been planted, in July. During the day Boll Worm moths 
