INSECTS AFFECTING PARK AND WOODLAND TREES 535 



Food habits. This species seems to have a preference for oaks, though 

 it is recorded as feeding on most deciduous trees. 



Remedies. -Being a leaf feeder it should be readily controlled by 

 thorough spraying with an arsenical poison whenever such is advisable. 



Bibliography 



1890 Packard, A. S. U. S. Ent. Com. 5th Rep't, p. 317-21 



Striped hickory caterpillar 



Datana angusii Gr. & Rb. 



Clusters of black, yellow-striped caterpillars about 2 inches long, occur on hickory, 

 walnut and birch. 



This species may be distinguished from the more familiar yellow- 

 necked apple worm, D. ministra Walk., by the prothoracic shield being 

 entirely black. It has very similar habits, though its list of food plants is 

 more restricted. The parent insect is marked almost exactly like I), 

 ministra Walk., differing in the dark smoky brown color throughout. 



Yellow-necked apple worm 



Da ta n a m in ist ra Walk. 



Clusters of black, yellow-necked, yellow-striped caterpillars nearly 2 inches long, 

 occur in midsummer on the twigs of a variety of trees. 



This species is well known in economic entomology as the yellow- 

 necked apple worm because of its depredations on this valuable fruit tree. 

 It is however a general feeder, having been recorded on apple, pear, cherry, 

 quince, linden, walnut, hickory, oak of various species, chestnut, beech, 

 hazel, hornbeam, birch, locust and sumac. 



Description. The full grown caterpillars are black, about 2 inches in 

 length with a yellow thoracic shield and a series of four black lines on each 

 side of the body. This species and its associates feed in clusters and have 

 the peculiar habit of elevating both extremities when disturbed. 



The adult insect is a reddish brown moth with a wing spread of about 

 1^4 inches. The fore wings are crossed by a series of four or five oblique 



