500, INSECT PESTS OF FARM, GARDEN AND ORCHARD 



are expanding, at first eating small holes through them, but later 



FIG. 423. The spring canker worm 

 (Paleacrita vernata): a, male moth; 6, 

 female moth both natural size; c, 

 joints of female antenna; d, joint of 

 female abdomen; e, ovipositor en- 

 larged. (After Riley.) 



FIG. 424. The spring can- 

 ker worm (Paleacrita-ver- 

 nata): a, larva natural 

 size; b, eggs natural size 

 and enlarged; c, side view 

 of segment of larva ;d, dor- 

 sal view of same both 

 enlarged. (From Riley. 



devouring all but the midribs. The young caterpillars have a habit 

 of dropping from the trees and hanging suspended on strands 



S 





FIG. 425. The female moths of the spring canker worm twice natural size, 

 and pupae three times natural size. (After Quaintance, U. S. Dept. Agr.) 



of silk. In four or five weeks they have become full grown and 

 enter the soil to a depth of 2 to 5 inches, where they hollow out 

 earthen cells, which 

 they line with a little 

 silk and in them 

 change to pupae, in 

 which stage the sum- 

 mer and winter is 



passed. The pupae is 



FIG. 426. Egg's of spring 'canker worm twice 

 natural size. (After W. E. Britton.) 



