Chapter IIL 



INSECTS INJURIOUS TO THE HICKORY. 



Carya alba, porcina, and tomentosa. 



Of the 170 species of insects which live at the expense of the 

 hickory, the most annoying and common borer is the Cyllene picta, or 

 common hickory borer, and the twig-girdler {Oncideres cingulatus). The 

 most destructive bark-borer appears to be Scolytus 4:spinosus. No 

 caterpillar is specially injurious, though the tree harbors a large num- 

 ber of species of different families. The buds, before unfolding, are 

 preyed upon by a little Phycid miner {Phycis rubrifasciella), while the 

 nuts are often despoiled and worm-eaten by the hickory-nut weevil 

 {Balaninus nasicus). The different kinds of hickory are usually infested 

 by the same species of insect. 



Of walnut insects, of which thus far 44 species are recorded, there 

 are also none specially injurious to the tree, which is therefore 

 much favored. The same can be said of the butternut, on which 29 

 species subsist, and of the chestnut, which affords a livelihood to 

 about 65 species of different orders, none of which overstep the nor- 

 mal limits or take unfair advantage of the provision afforded them 

 by the generous and beautiful foliage of this noble tree, unless we 

 except the chestnut borer {Arhopalus fulminans) and the chestnut 

 weevil. 



INJURING THE TRUNK A.W BRANCHES. 



1. The common hickory borer. 



Goes tigrinus (De Geer). 



Order Coleoptera ; family CerambyCid^. 



Boring large holes lengthwise in the solid wood, a cream-colored grub, with the first 

 segment behind the head flattened, pale tawny-yellowish, changing to a pupa in its 

 burrow, and in summer appearing as a long-horned brown beetle an inch long, cov- 

 ered with a coarse gray pubescence, the wing covers with a broad dark brown band 

 beyond their middle and another on their base, the thorax with an erect blunt spine 

 on each side ; the antennae pale yellowish, with their first joint dark brown. (Fitch). 



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