384 
Psyche 
[December 
in a fallen sapling, partly damming a large brook near Dun- 
can, Vicoria Island. In the Olympic Mountains A. insolens 
was common wherever a stream had deposited drift mate- 
rial. The species ranged from just below tree line on the 
north side of Mount Olympus to near Sol Due Hot Springs. 
A. insolens and A. striata were taken beside eddying pools 
in a rapid stretch of Tokul Creek, near North Bend Wash- 
ington, but were absent in the more gently flowing upper 
part of the same stream. A mass of floating logs and trash 
driven by the wind into the outlet of Lake Minnewanka, 
near Banff, Alberta, yielded a good series of A. lecontei and 
a few A. insolens. 
From all this it will be seen that the species of Amphizoa 
live in cover where a brook or the current set up by a wind 
will bring them food, and it is a fair deduction that the 
insects are in some part scavengers, although I have never 
seem them feeding. I do not know whether they travel 
much, but I knocked down a single lecontei as it flew over 
the lake at Banff. 
My specimens were all taken between July 4 and August 
19, but adults undoubtedly occur through a much longer 
season. Freshly emerged A. insolens were secured near 
North Bend, Washington, July 30. 
By day Amphizoa keeps out of sight, usually buried in 
gravel or clinging to a stick in a raft of floating trash. It is 
possible, however, that they are more active at night. 
The beetles may be taken easily once their haunts have 
been discovered. Where they are among rocks or in gravel, 
the bank is dug out at water level, and raked a little at a 
time into the brook ; where they are in floating material, the 
later is spread out on the water and beaten with a stick or 
the flat of the hand. The treatment in either case is to dis- 
lodge the beetles and separate them from the cover. When 
this is done, they swim slowly with their backs breaking the 
surface, for they cannot dive. 
Specimens are frequently found in crevices in floating 
logs, especially when the latter are surrounded by masses of 
drift. A few individuals escape by crawling down rocks or 
log jams into deep water, and these do act like Parnidse, but 
the behavior is for the most part much more like that of 
