Tees 
NIPONIUS CANALICOLLIS,. 249 

Relations to the Forest. 
This beetle is a predaceous one and is therefore most useful 
in the forest since it feeds upon the blue pine bark-bore:s. 
It is more especially abundant in the tunnels of the two Polygra- 
phus beetles, and itis constantly present here when no Tomicus 
beetles are to be found. It is probable, however, that on occa- 
sions, at any rate, it also attacks and feeds upon this latter 
insect, as when some living species of the Tomicus, Poly- 
graphus and the Niponius were sent to me, many of the 
Tomicus beetles arrived ina half-eaten state. I have not found 
it attacking the Pityogenes beetle, and the tunnels of this latter 
are too small for it to enter. 
This predaceous insect is found all through the area I have 
given as occupied by the Tomicus and Polygraphus pests. It 
has yet to be ascertained whether the adult also feeds upon the 
eggs, larve or pups of its hosts, or whether these stages are 
‘preyed upon by its own larval stages, 
It has also to be ascertained whether it follows the bark 
borers into the tree, or whether all the stages in its life history 
are spent there.' 
CUCUUJUS (?) SP. 
Plate XIII, fig. 7. 
Reference :—Provisionally named Ca_ujus (?) sp. 
Classification :—Order, COLEOPTERA. Family, Cucujide 
Predacesus upon Tomicus sp. (?), Polygraphus major and 
P. minor; Pityogenes contfere ; Scolytus major and S. 
minor. 
Description. 
The larva has not yet been observed. 
The beetle is oblong, shining, somewhat flat, the elytra 
being broader than the thorax at their point of juncture with 
it. Head black and exposed, and punctured, not being 
1 Since this note went to press, 1 have found pupz and mature insects 
of what I think is this Niponius in Polygraphus major galleries in 
deodar saplings (see foot-note on p. 237). The beetles were, I think, 
feeding upon the nearly mature Polygraphus insects. This would seem to 
prove that the larvae feed inside the tree in the larval galleries of the host. 
S2 
