248 
Some Insect Enemies of Tomicus sp. and its Allies, 
NIPONIUS CANALICOLLIS, 
LEWIS. 
Plate XIII, fig. 6. 
Reference :—Ann. Mag. Nat. Hist. Ser.!7, Vol. viii, November 1901. 
Classification :—Order, COLEOPTERA. Family, Histeride. 
Predaceous upon Tomicus sp. (Blue Pine Tomicus) ; Polygra- 
phus major, MS., and P, minor, MS. 
Description. 
The larva of this insect has not yet been discovered. 
The beetle is cylindrical, oblong, black and shining, the tarsi 
being palish ; head somewhat robust and sulcate between the 
cephalic projections; antenn# elbowed, ending in a club at 
their tips; the thorax has a very conspicuous median channel 
which sometimes reaches the base, but is always somewhat 
shortened in front; on either side of the channel the surface 
is uneven and the punctures irregular in size and form. The 
elytra have few striz and leave two segments of the body 
exposed below their tips. The tibia are rather slender, they 
and the thighs being black. 
Length 33 to 44 millim. PI. XIII, fig. 6, shows a dorsal and 
side view of this beetle. 
Life History, 
Neither the larval nor pupal stages have yet been observed, 
The beetle was first discovered early in May (tgot) in the 
tunnels of bark-borers in the blue pine. Subsequently mature 
insects were also found in the blue pine trees towards the end 
of June, these possibly being those of a later generation. The 
number of generations the beetle passes through during the 
year is, however, as yet undetermined, Fully mature beetles 
were found in the trees in the middle of December, amongst 
imagoes of the Blue Pine Tomicus and the two species of Poly- 
graphus beetles described above. It may be that the number 
of its generations corresponds to those of its hosts. 

