258 NEW YORK STATE MUSEUM 



Forming galls on or killing willow shoots 



European willows are attacked by a small, black midge w hich produces irregular, some- 

 what fusiform galls inhabited by yellowish jumping larvae 



European willow gall midge, R h a b d o p h a g a s a 1 i c i s, p. 299 



Sudden wilting of terminal shoots may be caused by a sawfly girdling the twigs after 

 depositing her eggs Willow shoot sawfly, Janus integer, p. 302 



Leaf feeders 



Reddish, white striped or black, white haired caterpillars from i/l to 1)2 inches in length, 

 feed in large clusters in midsummer on black walnut and other trees 



Black walnut cateritillar Da tan a i n t e g e r r i m a, p. 303 



A large, bluish green caterpillar with four conspicuous hornlike projections on the thoracic 



segments and a number of smaller ones, occurs in September on hickory and other 



trees Hickory horned devil, C i t h e r o n i a r e g al i s, p. 305 



Black spiny caterpillars with 4 orange yellow stripes on the back and 2 along each side, 

 frequently strip the foliage from scrub and other oaks in August 



Yellow striped oak caterpillar, Anisota sanatoria, p. 306 

 Small, black, spiny caterpillars occur in early summer, feeding in company on the leaves 

 of various oaks, particularly in swampy places 



Buck or maia moth, H e m i 1 e u c a m a i a, p. 310 

 Snow white, black dotted, black tufted caterpillars occur in clusters during July, August 

 and September, on the tender leaves of hickory and other trees 



Hickory tussock moth. H a 1 i s i d o t a c a r y a e, p. 314 

 Leaves of white birch arc sometimes skeletonized by a small, pale green caterpillar. The 

 foliage turns brown the latter part of the summer, aiid the small, brownish yellow, 

 ribbed cocoons serve to identify the depredator 



Birch leaf skeletonizer, B u c c u 1 a t r i x c a n a d e n s i s e 1 1 a, p. 315 

 Yellowish beetles or blackish grubs about fk inch in length, fre(iuently defoliate willows 

 and poplars, specially in the Western States 



Cottonwood leaf beetle, M e 1 a s o m a s c r i p t a, p. 3 1 7 

 Greenish black sawfly larwae about * ',0 inch long and with heart-shaped, yellowish spots 

 on each side, defoliate willow and poplar 



Yellow-spotted willow slug, Pteronus ven trails, p. 322 

 Blisterlike spots or eroded, skeletonized areas on honey locust leaves 



Locust leaf miner, Odontota dorsalis, p. 325 



Sucking insects 



A circular, convex, bright yellow or golden scale insect about 'Ae inch in diameter, some- 

 times occurs on oak twigs in very large numbers 



Golden oak scale, Asterolecanium variolosum, p. 329 



