INSECTS AFFECTING PARK AND WOODLAND TREES 



459 



enlarged 



on the wiiiL; covers. These latter are as follows : A somewhat irrei'ular 

 trianijular spot at the basal third of each wing cover, an irregular, angii- 

 lated, transverse band at the apical third, and a short, oblique, subrectan- 

 gular spot near the apex. The mark at the basal third is 

 absent in some specimens. This beautiful buprestid bores 

 in maple, according to Mr Hunt. Dr Fletcher has found 

 it abundant on poplars, and it is recorded as rare in New 

 Jersey. 



White-horned maple borer 

 Xyp/itdria albicornis Harr. 

 .\ slender, blackish, wasplikc insect about half an inch long and 

 witli most of the antennae white, bores as a larva in diseased hard ''» '". " 

 maple in July. (original) 



Examples of this interesting species were taken July 4, 1905, at Nas- 

 sau, on the underside of a dying sugar maple limb, evidently destroyed by 

 a fungous or bacterial affection. The foliage had wilted just a few da)s 

 before and discolored areas extended through the wood almost the entire 

 length of the limb, the abnormality being more evident at its "base. The 

 bark separated readily from the wood and an examination aliout the places 

 where the insects were found, showed masses of eggs evidently belonging 

 to this species, deposited in peculiar elongate cavities in the inner bark. A 

 favorite spot seemed to be at the very base of the limb, usuall\- near an 

 elevated or rough portion of the bark. 



The eggs occurred in irregular masses of a few to about 15, were pure 

 white in color, about i mm long, fusiform and with a slender, transparent, 

 rtagellate appendage about .75 mm long. The eggs were almost invariably 

 in slight cavities, possibly induced by sap collecting and fermenting in these 

 places. The smaller cavities were verj' slightly discolored while larger ones 

 apparently varied from dark brown to nearly black. Oviposition was so 

 abundant that 15 to 20 or more of these ft<g'g masses were easil\ found in 

 10 or 15 minutes work. This species undoubtedly bores in decaying hard 

 maple limbs In much the same way as X y p h i d r i a p r o \- a n c h c r i Cress. 



