Insects Bred from American Larch 51 
lower galleries was first constructed, the upper gallery was 
compared in fourteen engravings with the lower gallery hav- 
ing the most egg-niches. The average for the upper gallery 
is 33.64 eggs and for the lower gallery 29.07 eggs. Of the 
fourteen burrows the greater number of eggs is found in the 
upper gallery in eight cases, in one of the lower ones in five 
cases, and one case shows the two equal. 
The eggs are laid in May and June and the beetles prefer 
dying or very recently dead trees in which to breed. They 
often, however, breed in bark which is still quite sappy, and 
cases have been found where the excessive flow of pitch in 
the egg-gallery has caused the gallery to be abandoned. Other 
cases are numerous where a considerable amount of pitch 
had exuded into the egg-gallery but where the beetle had been 
able to overcome the resistance of the tree and to rear its 
brood. 
An attempt was made to induce reared material to re-enter 
larch anew in order that their habits and life history could 
be studied more in detail. Material containing the brood of 
H. picew was brought into the laboratory on January 5 and 
February 26, 1917. The larvae, which were in various 
stages from half-grown to nearly full-sized larvae, readily 
transformed and emerged in large numbers as adults. Larvae 
which were observed to be full- grown and ready to pupate 
were removed from the bark and placed in slender dishes 
upon slightly moistened sawdust. A number of these 
pupated and transformed to adults while under observation. 
Full notes were taken of all observations. The length of the 
pupal stage under laboratory conditions was found to be 
about nine to eleven days. Extracts from the notes on one 
individual are given below. 
A larva pupated May 20. During its pupal stage it 
showed little activity, practically the only movement being a 
wriggling motion of the abdomen. This pupa transformed 
into the adult stage at 8:45 a. m. on May 31. The newly 
emerged adult showed considerable motion of the head and 
legs and contraction and expansion of the abdomen. It 
would seem to contract as much as possible with head bent 
