284 NE^V VORK STATE MUSEUM 



beginning of the winter, at which time they retire a Httle further into the 

 wood and close the opening of the burrows. When in thick limbs two or 

 three bore obliquel\' till they reach the center or near it, and then proceed 

 up it two or three inches, the galleries of different burrows being parallel 

 but not communicating. Dr Hamilton calls attention to the fact that 

 larvae near the center are larger, and he believes that onl}- they attain 

 maturity, though in our e.\perience the different sizes indicate the sexes and 

 unless parasitized all emerge. The larvae feed the second summer and 

 hil)ernate in pupal chambers near the center and emerge the following 

 spring. This insect and its wtjrk is shown on plate 6, figures 20-25. 



Description. The beetle is a cinnamon brown, white marked insect with 

 one elongated spot near the middle of the wing covers and a nearly circular 

 one toward the ape.x. 



Distribution. This species has been recordetl from Canada, New York, 

 New Jersey, Pennsylvania and Ohio, and appears to be limited in its range 

 to the northeastern Ihiited States. 



Natural enemies. Infested limbs are frequently investigated by wood- 

 peckers and undoubtetlh' many larvae perish owing to the activity of these 

 beneficial birds. 



Remedial measures. It should l)e comparatively easy to keep this insect 

 in check by cutting away the galls and burning them before the insects have 

 an opportunity to escape. The only objection is that this procedure would 

 be likely to mar the symmetry of the tree. 



Bibliography 

 1904 Felt, E. P. & Joutel, L. H. N. V. State Mus. ]!ul. 74, ].. 62-66 



Bronze birch borer 



Aorilus aiixnis Gor\-. 



A flattened whitish rather delicate grub, about f'4 inch in length, with a large flattened 

 head, may be found boring the inner bark of white and other birches. 



The work of this destructive borer was brought to the writer's attention 

 in 1898, because of its serious injuries to white birches at Buffalo. Numer- 



