54 College of Forestry. 
The adult of this beetle was bred out from limbs of pine 
containing no other bark-beetles than Pityogenes. ‘This 
material was brought into the laboratory in April and the 
adult of P. dislocatus emerged June 3. It is very probable 
that it was in the larval stage when the limbs were placed 
in the breeding jars. 
Regarding this species, Hopkins (1893, 1899) reports 
the adults as predaceous upon Polygraphus rufipennis 
Kirby in black spruce and the larvae as occurring with 
Pityophthorus consimilis Lec. in sumach and with Pityo- 
phthorus N. sp. in Norway spruce. He also records it as 
occurring with Scolytus regulosus Ratz. in apple bark. Felt 
06 (p. 449) states that LeConte reared this species from 
limbs of hickory infested with Chramesus icoriae Lec. and 
that it was reared by himself (p. 503) from limbs of hick- 
ory “infested with Chyrysobothris femorata Fabr. and 
Magdalis olyra Herbst, which were preyed on by several 
parasites, and this clerid may possibly have been subsisting 
on the latter borer.” 
P. dislocatus seems to be distributed throughout the 
eastern portion of the country. Felt (’06 p. 503) records it 
from New York and states that it “has been listed from 
the vicinity of Cincinnati O., south western Pennsylvania, 
various localities in New Jersey, and from West Virginia. 
Wolcott (’09) records this species for Pennsylvania, Wis- 
consin and Ohio, and (710) lists it from five counties in 
Indiana. 
In addition to these two predators a small, slender staphy- 
linid beetle was found quite often in the burrows of P. hop- 
kinst. It is doubtful whether this is predaceous on any 
stage of the bark-beetle or whether it is merely a scavenger 
living on the decaying frass, bark and other matter in the 
burrows. Two Hemvzptera, probably predaceous in their 
habits, were also taken. Neither of these were identified, 
one being lost in the mails while the other was immature. 
Two species of predaceous mites belonging to the family 
Gamasidae were also found in the burrows and upon the 
bodies of P. hopkinsi. The smaller of these was identified 
