June, '19] VICKERY AND WILSON: WINGLESS MAY BEETLES 241 



the traps every morning and the number recorded. The records of 

 two of these barriers are given here. 



Barrier No. 2: This barrier was constructed in a cotton patch in the 

 laboratory garden on May 22, 1918. A plot 20 feet square was 

 inclosed by means of boards 1 inch thick, 4 inches wide, and 20 feet 

 long. On the inside one eight-inch flower pot was placed in each 

 corner. Pots were not placed on the outside until May 23 when one 

 was placed at the middle of each side, and on May 28 one was placed 

 at each outer corner. 



A record of the collections made at this barrier is given below. 

 Beetles were collected from May 23 until July 15, 102 being caught on 

 the inside and 953 on outside. 



Table Showing Number of Lachnosterna farcta Caught in Barrier 



Observations were discontinued on July 23. 

 * No observations made. 



Barrier Xo. 6: On July 3, 1918, a barrier was oonstructod around 

 a bean patch, consisting of five rows 150 feet long, located in the south 

 part of San Antonio. This barritM- was made of boards 1 inch in thick- 

 ness and 4 inches in width placed on one edge, fittiiig tightly on the 

 surface of the ground. The ends were held togctlier l)y means of 

 pieces of shingle nailed on the top edges and the boards were supported 



