Plate IV. 
Fie. 10. Burrow of Hccoptogaster picee in larch, having 
only one egg-gallery. The length of this one is remarkable 
even for uniramous burrows, as is also the number of egg- 
niches. Slightly more than three-fourths natural size. 
Fie. 11. View of the inner bark of larch, showing the 
burrows of Crypturgus pusillus arising from the engravings 
of P. rufipennis. This shows the usual confused appearance 
after the larve have developed and destroyed the egg- 
galleries. The flocculent white material is due to fungi. 
Reduced to about four-fifths natural size. 
Fig. 12. Engraving of Crypturgus pusillus in the inner 
bark of red spruce. In this case twenty-two egg-galleries 
arise from the nuptial chamber of an abandoned burrow of 
P. rufipennis and several more from the egg-gallery. The 
egg-galleries here are not so much destroyed by the larve 
as usual because most of these have burrowed at another level, 
in the outer part of the inner bark. About three-fourths 
natural size. 
Fie. 13. Engraving of C. pusillus m inner bark of larch. 
Here also the egg-galleries originate from the nuptial cham- 
ber of P. rufipennis. About four-fifths natural size. 
