254 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 9 



?\SS3G^ 



The five stations (Fig. 11) in the southern third of the state were 

 located as follows: at Lancaster in the southwestern corner of the 



state, fifteen miles from the Missis- 

 sippi river and twenty-five miles from 

 the lUinois state line; at Dodgeville, 

 thirty miles east and slightly north of 

 Lancaster; at Madison, thirty-five 

 miles east and north of Dodgeville; 

 at Raraboo, forty miles northeast of 

 Dodgeville and thirty-five miles north- 

 west of Madison; and at Ripon, fifty 

 miles northeast of Baraboo. With the 

 exception of Madison, the stations 

 were situated in a line running north- 

 east from Lancaster, 120 miles to 

 Ripon. 



Generally speaking, Lancaster and 

 Dodgeville are located similarly in a 

 high rolling plateau region. Madison 

 is on a lower level of black soil to 

 the east of a hilly region. Baraboo is 

 in a distinct region north of the Wis- 

 consin river valley, featured by bold 

 granite hills and higher plateaus. 

 Ripon is in a lower rolling region of 

 black soil. The latter two stations 

 record slightly lower temperatures. 



The forty light traps were operated 



from the time of the first flights in 



early May until late in June, and 



succeeded in catching an approx- 



thirty-six thousand four hundred 



Fig. 10. Coleman Gasoline Arc 

 Lantern (300-400 candle power) 

 used in trapping experiments. [Cut 

 furnished by the Coleman Lamp Co., 

 Wichita, Kans.] 



imate total of one million 

 (1,036,400) beetles. 



Some striking results were obtained with regard to the distribution 

 of species in this comparatively limited area, the optimum tempera- 

 tures for flights, favorable location and arrangement of fight traps. 

 A mere summary of important results seems most desirable in this 

 paper. 



Temperature an Important Flight Factor 



With 7 p. m. temperatures much below 66° Fahrenheit, flights 

 were very small and almost ceased at 62°. Results show that 99.6 



