58 



CALOSOMA SYCOPHANTA. 



females, with plenty of gipsy moth caterpillars for food. Beetles of 

 this species were known to be present in the nearest wooded areas. 

 The trap was visited every three or four days until July 4, to see if 



males had been caught, 

 and to supply food to 

 the females. It was 

 then visited about every 

 ten days, until the mid- 

 dle of August, when it 

 was removed. No males 

 were caught during the 

 experiment. 



Another experiment, 

 using the same kind of 

 a trap, was begun at 

 Wilmington, Mass., June 

 15,1910. No specimens 

 of sycoplianta were 

 known to be present 

 vvithin 2 miles of the 

 point where the trap 

 was placed. Four young 

 and two old female 

 beetles were put into 

 the cage, and it was set 

 up in a pine tree 45 feet 

 from the ground. (See 

 PI. VIII.) 



Marked males were 

 then liberated at dis- 

 tances of one-half mile 

 and 1 mile, respectively, 

 north, south, east, and 

 west of the trap, 1 old 

 and 6 young beetles 

 being released at each 

 of the eight stations. 



None of the males or 

 females in this experi- 

 ment had had an oppor- 

 tunity to come into 

 contact with the oppo- 

 site sex. This trap was examined every three or four days until the 

 middle of July, and then at less frequent intervals, but no males 

 were caught. On August 11 the trap was removed. 



Fig. 20.— Assembling cage: a, Showing imier cage removed; b, 

 cage ready for use. (Original. ) 



