282 



\K\V YORK STATE MUSEUM 



The life history of this insect has been summarized by him as follows : 

 The adult beetles appear in the District of Columbia during May and the 

 early part of June, their emergence varying according to season and locality. 

 Eggs are deposited on the tree and the larvae work under the bark in the 

 manner described above. The following spring they construct a chamber 

 which in living trees, so far as observed, is always in the bark, and in the 

 case of small dead trees in the wood. The final transformations take 

 place in cells thus formed. The pupal stage lasts about two weeks and 

 then the beetles appear. Mr Chittenden records this species as infesting 

 the white, scarlet and yellow oaks. 



Description. The beetle is nearly yk 

 inch in length, elongate and subcylindric 

 in shape. It is black with a more or less 

 greenish tinge, and the thorax is clothed 

 with a light golden yellow pubescence, and 

 the wing covers are each marked with a 

 stripe of the same color. The larva or 

 borer is long, slender, considerably flattened, 

 and a milk white or yellowish color, except 

 the mouth parts and the peculiar anal forks 

 which are dark brown. The pupa is white 

 like the larva. 



Distribution. This species is a native 

 insect and has been recorded as occurring from Maine and Massachusetts, 

 southward to Texas and westward to the Rocky mountains. 



Natural enemies. A single parasite, S p a t h i u s s i m i 1 1 i m u s Ashm., 

 has been bred from this insect in considerable numbers. Mr Chittenden 

 states that it was exceedingly abundant in the District of Columbia during 

 the two years this borer was destructive. Another parasite was reared but 

 has not been identified. 



Preventive or remedial measures. An infested tree can not be saved 

 and for the sake of others it should be cut before the appearance of the 





of female 



Mg. 48 A g r i 1 n s b i I i 

 beetle, enlarged ; ^=anten 

 « =cl.iws of posterior tai 

 what enlarged: 5 =same of male, somewhat 

 enlarged ; (•=larva, enlarged ; (^=pupa, enlarged. 

 (After Chittenden, U. S. Dep't Agric. Div. Ent. 

 Cir. 24, 2 ser. '97) 



