Insects injurious to Locust, Maples, Cottonwoods, etc. 183 



tacks the outer trees only. Something may be done to save a val- 

 uable tree by soaping the trunk in August, or by whitewashing, or 

 covering with grafting composition. This tree suifers from several 

 leaf-miners (against which there is no remedy but hand-picking), 

 and several gall-flies and midges. 



HI. Larva of the Melolontha, upon the 

 Boot of an Acacia. 



112. Pupa of the Melolontha, 

 (upper aud under sides). 



723. The pods and seeds of the locust are at times inhabited by 

 a weevil, and dead locust timber is liable to be consumed by borers 

 differing from those that pierce the living trees. 



724. Insects injurious to the Maple. Of these 38 are mentioned, 

 including a borer that pierces the solid trunks of sound sugar-maple 

 trees (Glycobius speciosas), the flat-headed borer that is also found 

 on the apple tree (Chrysohothris femoraia) , and various worms — the 

 larvse of moths that strip the trees of their leaves. The American 

 silk-worm (Telea polyphenvus) sometimes attacks the maple, and does 

 much damage. 



725. Insects injwnmm to the Cottonwood. Of these 16 are named, 

 chiefly beetles that bore the wood or consume the leaves. There 

 are several saw-flies and gall-insects that affect the leaves and 

 twigs. 



726. Insects injurious to the Poplars. Of these 36 are named, in- 

 cluding borers, span-worms, gall-lice, several leaf-rollers, and miners 

 that eat out the soft parts of the leaves. The larvae of the genus 



