SOME INSECTS INJURIOUS TO ORCHARD FRUITS 571 



seems to be particularly injurious in the Mississippi Valley. The 

 full-grown caterpillar is from three-quarters to one inch long, 

 slender, and cylindrical, and has but one pair of prolegs on 



FIG. 423. The spring canker worm FIG. 424. The spring can- 



(Paleacrita vernata) : a, male moth ; b, ker worm (Paleacrita ver- 



female moth both natural size; c, nata): a, larva natural 



joints of female antenna; d, joint of s i ze ; 6, eggs natural size 



female abdomen; e, ovipositor en- and enlarged ; c, side view 



larged. (After Riley.) of segment of larva; d, 



dorsal view of same 

 both enlarged. (From 

 Riley.) 



the middle of the abdomen. The color varies from ash-gray 

 to green or yellow, but the predominating color is dark greenish- 

 olive or blackish, marked with narrow pale lines down the back 



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

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



and a whitish stripe along each side. The wings of the male moths 

 expand an inch, and are semi-transparent, brownish-gray, with 

 three rather indistinct dark lines across the fore-wings. The 



