Fig. 1.— Three types of cages used in continuous mass rearing of European com borer larvae: A, cage No. 1 with beans 

 inside and with humidifier underneath; B, cage No. 2 with beans inside and with humidifier underneath; C, cage No. 3 with 

 part of paper carton torn to show beans inside. 



Fig. 2. — Cages No. 1 and No. 2 and their component parts. A is cape No. 1 complete, including top (top of 60-mm. petri 

 dish), and B, C, D are component parts: S, 1-1/2-inch length of Lucite tubing (2 inches in diameter, one-eighth-inch wall 

 thickness) with 80-mesh brass screen wire bottom; C, aluminum dish (32 mm. in diameter) to hold the beans; and, D, enameled 

 copper wire in the form of a rough M or W to serve as a spacer beneath the aluminum dish. £ is cage No. 2 complete, including 

 top (top or bottom of 95-mm. petri dish), and F, G are component parts: F, 1-1 ''2-inch length of Lucite tubing (3-1 '4 inches in 

 diameter, one-eighth-inch wall thickness) with SO-mesh brass screen wire bottom and, C, one of two discs (2-3 4 inches in 

 diameter) made from 18 x 14 mesh copper window-screen wire. (A layer of beans is laid between the two discs when the cage 

 is in operation.) 



