276 



INJUEIOUS INSECTS 



ners, or carried (by means of suitable handles or support- 

 ing rods) by hand. If the ''pan" is larger than, say, 

 three feet square, it is provided with transverse positions 

 which serve to prevent any slopping of the contents (in 

 case water and oil are used), when the device is subjected 

 to any sudden irregular motion, such as tipping, or in 

 case of a wheeled pan, when it passes over uneven 

 ground. The wheeled pan is used like a wheelbarrow; 

 the hand-worked pan is carried by long handles at its 

 ends. On pushing or carrying, as the case may be, these 

 pans, supplied with oil, over the infested fields, and man- 



Fig. 163.— OOAX-OIL PAN FOE CATCHINQ LOCUSTS. 



ipulating the shafts and handles so as to elevate or de- 

 press the front edge of the pan as may be desired, the 

 locusts are startled from their places and spring into the 

 tar or oil, when they are either entangled by the tar and 

 die slowly, or, coming in contact with the more active 

 portion of the oil expire almost immediatelv. Fig. 162 

 represents a sheet-iron pan that has been used in some lo- 

 calities with good results. It must be made sufiBciently 

 tight to hold kerosene, of which sufficient is used to cover 

 the bottom. A simpler form of pan is shown in figure 

 163. The bottom of this is to be covered with a thin lay- 

 er of coal tar. Pans of this kind are made light enough 

 to be drawn across the fields by boys ; or if heavy, horses 



