INJURIES BY ROUNDHEADED BORERS. 



349 



wood, cutting should always be done between the 1st of October and 

 the 1st of April and the* bark removed, and the tops and thinnings 

 burned. When it is necessary to 

 cut trees between the 1st of May 

 and the middle of September, 

 the tops should be burned and 

 the logs either barked, or sub- 

 merged in water for a few days 



before they are 

 manufactured. 1 



shipped or 



THE PAINTED HICKORY BORER. 



(Cyllene canjcc Galian. 2 ) 



The painted hickory borer is 

 a close relative of the locust 

 borer and one of the commonest 

 and most destructive borers in 

 dead and dying hickory, the 

 larval mines often riddling the 

 sapwood and sometimes the 

 heartwood as well. Besides 

 hickory, it attacks walnut, 

 honey locust, mulberry, and 

 Osage orange, but never attacks 

 the black locust. Its range ap- 

 pears to be coextensive with that 

 of hickory. 



The larva is a creamy white, 

 compact grub and has three 

 pairs of legs. The adult so 

 closely resembles the adult of 

 the locust borer (fig. 22, b) as 

 to be, to the ordinary eye, indis- 

 tinguishable from it. The sea- 

 sonal history, however, is quite 

 different from that of the locust 

 borer. The adults fly and de- 

 posit eggs in May and June and 

 do not appear at other seasons 

 of the year. The egg is laid in a 

 crevice of bark, and the young larva hatching therefrom proceeds to 

 the inner bark and soon enters the wood. If a great number of larva? 



1 See U. S. Dept. of Agriculture, Bureau of Entomology, Bui. 58, Part I, and Bui. 58, 

 Part III. 



2 Known for many years under the name of Cyllene pictus Drury. 



FIG. 23. Work of the painted hickory borer 

 (Ci/llcnc c<in/<r). Section of hickory log 

 showing larval mines. (Original.) 



