CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 1 99 



Larva. — Two inches long; head large and black; cervical shield dull 

 orange; back and sides striped alternately with black and yellow lines; 

 body thinly clothed with soft white hairs. Larvae occur in clusters and 

 at rest their bodies assume a characteristic bow-form. When young 

 they are chestnut brown. At maturity they descend to the ground 

 and burrow to a depth of 3 inches. Larval stage 5-6 weeks. 



Ptipa. — A naked brown object in the ground nearly an inch long. 



Control. — Hand-pick the clusters of caterpillars; spray the cater- 

 pillars with an arsenical. 



Walnut Caterpillar (Datana integerrima G. and R.) is often destruc- 

 tive on walnut, butternut, and hickory, and also on oak, beach, apple, 

 and hawthorn. 



Adult. — A buff-brown moth with darker bands across the fore 

 wings; 1^-2 inches wing expanse. July-August. 



Eggs. — ^Laid in clusters of 100 or more on underside of leaves. 



LarvcB. — Caterpillars feed in clusters devouring the leaves; when 

 nearing maturity they separate. Body black, with a loose covering 

 of soft whitish hairs 2 inches long; when at rest they assume a bow-form. 

 At moulting times they gather in large numbers on the trunks and 

 larger branches. When mature they descend and enter the earth. 



Pupa. — A dark brown chrysalis; hibernates in this stage. 



Control. — Spray caterpillars with arsenical; collect the clusters of 

 caterpillars. 



Red-humped Apple Caterpillar (Schizura concinna Sm. and Ab.). 

 Adult. — Moth expanding i3^ inches; body light brown, thorax dark 

 brown; fore wings greyish on outer margin and dark brown on 

 inner, with a brown dot near middle, a spot near each angle and 

 several longitudinal streaks along posterior margin. Hind wings 

 brownish. June and July. One brood in the Narth. 



Eggs. — ^ White, round, slightly flattened deposited in a cluster of 

 40-100 on the under side of leaf in July. 



Larva. — Body striped with yellow, black and white lines; a double 

 row of black spines on back; head coral-red; a red hump on fourth seg- 

 ment. Full-grown in late summer and fall, when they spin loose silken 

 cocoons, mixed with rubbish, on the ground. Gregarious, attacking 

 apple, pear, plum, cherry, and blackberry and some forest trees. 



Pupa. — Formed in fall and pass the winter and early spring in or on 

 the ground. 



