218 CLERUS SP. 



It would thus seem to be fairly omnivorous as far as coni- 
ferous bark-beetles are concerned, It will not eat dead 
beetles, 
Protection. 
The fact that the larvee of this beetle pupate in the outer 
bark and that the beetle never goes into the tree renders its 
immunity from destruction great. Under the prescriptions 
for getting rid of bark beetles (see p. 206 ante), we have to bark 
the trees when they are full of grubs and expose the bark tothe 
sun. This kills all the bark beetle larva, ‘To a certain extent 
many Clerid larvee will also suffer, but the mature ones will at 
once move into the outer bark and pupate there, and the barking 
will have no effect upon’ them. In the case of the beetles, the 
barking of the trees will have no effect whatsoever since they 
never go into the tree. Wethus see that in the case of this 
insect remedies undertaken to get rid of its food beetles will 
not necessarily kill either it or its larve, though many of the 
younger ones may die off with th= Scolytus larve, There 
will not for some time to come be much fear of the Clerids suffer- 
ing from want owing toa bark-beetle famine occurring from 
these operations. 
1 have also found the Clerid on spruce feeding upon two 
species of wood-boring beetles, Ryncholus sp. and Hylastes sp, 
Points in the life history requiring further observation, 
1. Length of life of the beetle. Does it appear continuously 
in the beetle state from May to October? 
2. Length of time spent in the larval and pupal stages, 
3. The number of eggs laid by the @ beetle, 
4. The number of generations passed through during the 
year. 

