the funnel and fell into the cage below. The long downspout was used only on 
certain traps so that the cage would be within reach of a man standing on the 
ground. 
The sides of the cage were made of 1/3-inch mesh screen, so that most of 
the small insects could escape. The bottom of the cage had a hole 5 inches in 
diameter covered with a sliding door for easy access. Some hornworm moths were 
killed or injured when caught, and all had badly battered wings if left too long 
in the trap, but most appeared to be in excellent condition early in the morning. 
The light traps used in 1961 were very similar, except that the cage was 
larger and made of finer mesh screen, and the traps were mounted closer to the 
ground. 
LOCATION AND DESIGN OF EXPERIMENTS 
There were four successive experiments, the first three in 1961 and the 
fourth in 1962. In the first experiment, 62 bait traps were placed in four 
concentric circles. The inner circle had a radius of one-fourth mile; the 
second, one-half; the third, three-fourths; and the outer, 1 mile. The area was 
3.14 square miles. Traps were located at approximately quarter-mile intervals on 
each circle regardless of vegetation or terrain, except that they could not be 
placed in fields of row crops or in pastures. At these locations the traps were 
placed on the nearest field border. 
The center of the experiment was about three-fourths mile northwest of 
Providence, N.C. In addition to the bait traps, two light traps similar to those 
previously described were located outside but near the bait-trap area. One was 
1.26 miles northeast of the center, the other 1.53 miles northwest. Another 
light trap of an older design was located at Oxford. 
In the second experiment, 14 light traps were placed in an area of approxi- 
mately 2 square miles. Most of the moths caught in these traps were marked and 
released near the center of this 2-square-mile area, and the remainder were 
released in the center of the bait-trap experiment, which was still in operation. 
The distance of the light traps from the first release point ranged from 0.18 to 
1.04 miles, except for trap 15, which was 2.43 miles distant. The second release 
point ranged from 1.52 to 2.69 miles from light traps 1 to 14 and was 1.33 miles 
from trap 15. 
In the third experiment, the same 14 light traps were located in a much 
larger area covering approximately 25 square miles. The center of this area, 
where the moths were released, was 6 miles west of Oxford. The traps were 0.89 
to 4.36 miles from this point. These traps were operated from August 19 to 
September 25. Six additional light traps were located 4 to 10 miles from the 
center on September 9. 
In 1962 the experimental area consisted of two tangent circles, each 12 
miles in diameter. The western circle had 6 light traps placed at about 1-mile 
intervals in each of four directions from the center outward, with a total of 
24 traps in 113 square miles. The eastern circle had 324 light traps in an area 
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