60 



THE EEPORT OF THE ENTOMOLOGICAL SOCIETY. 



Xo. 36 



and dying branches should be removed and burned before the first of June. When 

 fresh holes of this beetle are found in small trees, it is an easy matter to inject 

 into the holes a little kerosene or other oil. The oil kills the insects which it 

 wets, and destroys the food-fungus, with fatal results to the beetles and larv^. 



The adult female is black, cylindric, and about one-eighth of an inch in length. 

 The pronotum is bent very strongly ventrad in front, so that the anterior opening 

 is nearly horizontal. The head is globular and deeply sunk in the pronotum. 

 The antennal club is sub-globular and truncate distally. The venter of the abdo- 



FlG. 7. 



Figs. 6 and 7. Work of E. rugulosus in apple ; (p.c.) pupal cells sunk into the wood ; {f.h.) exit 



holes of matured beetles. These holes lie usually immediately over the pupal cells. 



The smaller holes in figure 7 were cut by pai-asites. 



men is evenly rounded. The truncate club and the strongly bent pronotum, as 

 well as its larger size, distinguish it instantly from the other two. The males 

 are much smaller than the females, wingless, and of a curious hump-backed shape. 

 The Peach-tree Bark-beetle, Phloeotribus liminaris, cuts all its tunnels be- 

 tween the bark and the wood. An egg-tunnel is cut by the adult and the eggs 

 laid in niches along the sides. The larvse bore away from, the egg-tunnel, keeping 

 between the bark and the wood, eventually following the grain of the wood, and 

 pupate in the enlarged end of the larval galleries thus formed. Later they appear 

 through holes cut in the bark above the pupal cells. The egg-tunnels of this species 



