360 



THE GYPSY MOTH. 



No. 13 was put out August 9, and taken in August 30, having 

 captured 163 males. 



No. 14 was put out August 10, and taken in August 30, having 

 captured 265 males. 



No. 15 was put out August 10, and taken in August 28, having 

 captured 208 males. 



Summary, 



Omitting No. 7, which remaiDed out but a few days, the 

 whole number of males taken by all the traps was 1,771. 

 The smallest number taken by any one of them was 34, the 

 largest number was 265 and the average 126.5. 



During the months of July and August, 1894, these ex- 

 periments were repeated by Mr. F. C. Schrader and four 

 other assistants. One hundred and ninety-one traps were 

 put up in the worst infested districts of Maiden, Medford 

 and Everett, and kept in working order during the time 

 that the males were flying. The traps were visited every 

 day, fresh gum applied when necessary, new females put 

 into the traps as often as needed, and careful records were 

 kept of the results. The trapping season began July 19, 

 and closed August 13. Two different styles of traps were 

 used. The first kind was made of two-quart tin varnish 

 cans, from each of which was suspended, about two inches 

 below it, a tin base 9 by 12 inches, dished, so as to slope 

 from the edges toward the centre, and attached by two strips 

 of tin to a loop on each of the narrow sides of the can. A 

 strip of tin was removed from each side of the can, and this 

 was replaced by brass wire gauze. The unfertilized females 

 were placed in the can, through the hole at the top, which 

 was kept closed by a cork stopper. The traps were sus- 

 pended from branches of trees by hooks eight inches long, 

 attached to the handle of the cans. 



The other kind was a four-leaved wooden trap, commonly 

 called the '*Shaw" trap (Plate 54), devised by Mr. H. J. 

 Shaw. It consisted of a horizontal base board of half-inch 

 lumber, one foot square, with narrow grooves at right angles 

 across the middle of the upper side. Two thin boards, twelve 

 inches wide and seven inches high, notched together in the 

 middle at right angles, were secured in the grooves in the 

 base board, thus forming four vertical wings. An opening 



