2 CIRCULAR 6 4 3, U. S. DEPARTMENT OF AGRICULTURE 



several locations and their operation was continued during the flight 

 seasons of 1935-37. A record of the nightly catch was kept, the 

 species, number of moths captured, and the proportion of the sexes 

 being tabulated. The traps were put in operation early enough in 

 the spring so that the first flights could be observed, and they were 

 kept in operation until cold weather in the fall stopped all flight 

 activity. 



Observations were made in the following six localities: Cherryvale, 

 Garden City, Hays, and Manhattan in Kansas and Lincoln and 

 Scottsbluff in Nebraska (fig. 1). These localities ranged in elevation 



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KANSAS 

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Figure 1. — Location of the light traps. 



as follows: Cherryvale 800 feet, Garden City 2,800 feet, Hays 2,000 

 feet, Manhattan 1,100 feet, Lincoln 1,200 feet, and Scottsbluff 

 3,900 feet. 



TRAPS 



With the exception of the one used at Manhattan, the traps were 

 of similar type and were designed by the senior writer. They con- 

 sisted of an inverted galvanized-iron cone, 2 feet in diameter, with a 

 roof of the same material. The lamp (fig. 2, B) was suspended in 

 the center just above the rim, and a fruit jar was attached to the bot- 

 tom of the cone for receiving the catch. The killing agent, calcium 

 cyanide, was put in a small sack and placed in the fruit jar. The 

 cyanide was renewed daily. 



The trap used at Manhattan (fig. 2, A) was designed by R. C. 

 Smith, of the Kansas Agricultural Experiment Station. Except for 

 a more shallow cone, and the use of glass buffers about the lamp, this 

 trap was the same as those at the other localities. Five-hundred- 

 watt clear lamps were used at Manhattan and Lincoln and 200-watt 

 inside-frosted lamps elsewhere. 



The locations of the traps were probably not ideal, but the availa- 

 bility of electric outlets was the deciding factor in the selection of 

 sites. These were as follows: 



(1) At Cherryvale the location was unsatisfactory. It was on a flour mill 

 that was illuminated nearly every night and near a transformer station that 

 was always brilliantly lighted. The competition of these other lights greatly 

 affected the catches, and the results from this trap are not considered of much 

 value. 



