INJURIOUS INSECTS OF I909 AND IQIO. 133 
Work with the Box Elder Borer. 
Moths of this insect were sent to Prof. Fernald for determi- 
nation some time during the summer of 1908. Prof. Fernald was 
unable at that time to give a definite determination because he 
lacked the males, that sex possessing the more distinctive char- 
acters. From the females sent him, he judged it to be Proteoteras 
aesculanum, Riley. 
After this further experiments were carried on to get more 
insects for determination, and to learn more about the life-history of 
the insect. First an experiment was conducted to secure the egg- 
laying of the moths and find out the length of larval life. Adults 
were placed in a breeding cage on box-elder seedlings. Some time 
after the moths had disappeared this experiment was examined, and 
large numbers of small larvae were found feeding next to the 
midribs of the leaves of the tree, and some were crawling up and 
down the stem of the plant. These larvae finally, after feeding on 
the leaves for a considerable length of time, as cooler weather came 
on during the latter part of August, stopped feeding on the leaves, 
which they had at this time pretty well skeletonized, and bored into 
the tips of the twigs. They remained in this position for some 
months, but the plant finally died and the insects also perished. A 
few small larvae were saved and kept in small branches of box 
elder, which were kept moist all winter, but these, too, finally died, 
so that a complete cycle of the life-history was not obtained, but it 
is evident that the small larvae pass the winter in twigs of box elder, 
and in the spring proceed with their development until they become 
full grown. 
On June 23d and again on July 14th, a large number of these 
borers were collected from box elder, for rearing to get the moths. 
By July 14th a large part of the borers gathered on June 23d had 
pupated, and from this time on the remaining larvae went into the 
pupal stage rapidly. On July 14th the first moth in captivity 
emerged. The last moth of which we have record. emerged on 
