52 College of Forestry 
downward and then thrust out its abdomen, head and legs 
in a “ stretching” movement. The true wings were extended 
at full length and the elytra were in a nearly normal posi- 
tion. The true wings were apparently gradually drawn up 
under the elytra and folded. This was accomplhshed by 
expansion and contraction (lengthening and shortening) of 
the abdomen. During this process, which required several 
hours, the true wings remained very flabby, even at the main 
supporting veins. They apparently were kept moistened by 
some substance which did not harden. At 1 p. m. the tips of 
the true wings were still visible, but by 8 a. m. the following 
day they had been entirely retracted to their normal adult 
position. By this time the callow adult was able to walk very 
feebly, but did not attain its full strength until a day or two 
later. At the time the young adult arises, the head and pro- 
thorax shows considerable color as does the metasterum and 
the pygidium. The elytra, abdomen and legs were a faint 
yellowish brown. All these parts gradually grew darker, but 
the insect had not yet attained its full color a week later 
(June 6). 
Although determined efforts were made to induce the new 
generation of adults to enter new larch, we were unsuccess- 
ful. At first young adults were confined in cages with suit- 
able pieces of wood, but they refused to breed in it. As it is 
a well-known fact that other species of Hccoptogaster feed 
for a time upon new growth of their host tree, young adults 
were confined with portion of limbs, including new growth 
and new leaves. However, they resolutely refused either to 
feed upon this material or to breed either in freshly killed 
or less recently killed larch, and we were therefore unable to 
make thorough observations upon their habits and behavior. 
A few broods were, however, started in the old parent host, 
but these were not discovered until November, 1917, and 
therefore were of no value except as they prove that these 
small scolytids may breed for two successive years in the 
same host. 
A careful study of the engravings give the results tabulated 
below: 
