46 BULLETIN 746, U. S. DEPARTMENT OF AGRICULTTTBE. 
been broken. The traps were operated during July. August, and Sep- 
tember, with the following results: 
Clear glass 58 males. 2 females. 
Mottled 26 males. 
Green IS males. 
Bine =, 15 males. 
Red _. 
Total males 117 
Total females 2 
Neither of the females which were attracted to the clear light con- 
tained eggs. 
The lights were arranged so that they were about 6 feet from a field 
of sugar cane. Observations were made to determine whether the 
number of canes infested by the moth borer had been lowered by the 
proximity of the lights, but this was not found to be the case, the 
infestation being as high as usual. 
In 1916 more experiments were conducted, larger traps made on 
the same principle as those previously employed being fitted with 
glasses of standardized colors prepared for railroad semaphore lights. 
The colors used were purple, blue. red. green, brown, and clear. The 
electric globes were of the same type as those used in 1915. The lights 
were operated on 54 days from May 9 to September 4. the results 
being as follows : 
Purple 5 males. 4 females. 
Bine 5 males. 
Red 
Green 6 males. 
Brown 1 male. 
Clear 44 males. 2 females. 
Total males 61 
Total females 6 
Experiments were conducted also on three night- in September 
with a 750-watt light taken into a cane field and operated by means 
of a long extension wire. This was suggested by Mr. E. E. Barber. 
It was observed that the moths would rise and then settle on the 
plants again, not continuing to fly around the light. Two males and 
five females were caught. There was some doubt as to whether two 
of the females had deposited their eggs, but the remaining three were 
certainly gravid. 
The operation of lights was also observed on a certain Louisiana 
plantation on a much larger scale, gasoline torches being pulled 
about over the plantation. One was equipped with a gasoline engine 
and other apparatus which caused a powerful suction of air back 
of the light, the insects being sucked into an inner chamber. The 
other arrangement was a train drawn on the plantation railway. 
