History and Habits of Pityogenes. 59 
Even though this form is not usually markedly injurious, 
the writer believes that it is good policy to take reasonable 
precautions to keep down the numbers. The best way to 
accomplish this is to destroy its favorite breeding places or 
better still to allow these to remain until the brood has 
begun to develop and then destroy them. To accomplish 
the purpose most perfectly, pine “slash”? from timber cut 
during the winter should be piled ready for burning but 
should not be burned until the first part of June. In this 
way the “slash” acts as a trap not only for Pityogenes 
hopkinst but for other more or less injurious beetles such as 
various species of Pztyogenes, Pityophthorus and Ips as 
well as numerous species of Buprestidae, Cerambycidae and 
of Ambrosia beetles which are often found in the same sort 
of material. Slash from timber cut during the early sum- 
mer (June 15th to August 1st) should be hieaeel during the 
latter half of August, ‘while that cut between August 1 and 
November 1 should: be disposed of before May 1 of the 
following spring. If this policy is consistently followed it 
will result in greatly reducing the numbers not only of 
P. hopkinsi but also of numerous other insects breeding in 
a similar situation and many sickly or weakened trees 
which would otherwise succumb to their attack will be saved. 
Danger of a more disastrous epidemic will also be over- 
come. 
SUMMARY OF OBSERVATIONS. 
Pityogenes hopkinsi passes the winter successfully in 
either the larval, pupal or adult condition but by far the 
larger number hibernate as adults. 
With the advent of spring the young adults feed vora- 
ciously for several days as shown by the large amount of 
refuse pushed out through the newly made ventilation 
openings. 
Emergence of the overwintered adults takes place during 
the latter part of April and first part of May depending 
upon weather conditions. They do not form into so-called 
“swarms” but the males emerge singly several days earlier 
than the females. 
