35 



CANKEEWOEMS. 



(Figs. 26, 27, 28, and 29.) 



These slender, bare caterpillars appear on apple and other fruit 

 trees in early spring and oat holes in the leaves. As .they crawl they 

 loop up the body, and are thus called "measuring worm.'s" or "inch 

 worms." There are two species of the cankerworms, their habits, how- 



FlG. 26. — Alsophila pometaria: a, male; 6, femalt;. 

 e, d, details. (EUey.) 



Fig. 27. — Al&oi)ldUi pometaria: a, b, c, eggs; 

 /, larva; c, ri, segments of same; g, pupa. 

 (Riley.) 



ever, being similar. The eggs are laid in clusters on the tree in the fall 

 and early winter, with the fall species {Alsophila pometaria Harr.); in 

 March or April with the spring species {Paleacrita vernata Peck). 

 The eggs of the former are flattened on top; those of the latter are 

 rounded. The larva hatch in earlv spring and at once feed on the 



Fig. 2S.—PcUeacrila venmla: a, male; 6, female, 

 c, d, e, details. (Riley.) 



Fig. 29. — Paleacrita veniata: a, cater- 

 pillar; &, egg; c, d, segment of 

 caterpillar. (Riley.) 



leaves. When full grown they descend to the ground and pupate 

 therein, the moths issuing in late fall or very early spring. The 

 females are wingless, and obliged to crawl up the tree to deposit eggs. 

 The males have large, thin, gray wings. There is but one brood each 

 year. 



THE PEACH-TEEE BOEEE. 



{Sanninoidea exitiosa Say — fig. 30.) 



This destructive insect is readily discerned by the presence of a 

 gummy exudation mixed with frass and excrement at or near the base 

 of the tree. The parent moth lays the eggs singly (from May to July, 

 according to latitude) on the bark of the tree, usually near the base. 

 The young larva burrows into the bark and mines between it and the 



