100 
Psyche 
[June -Sept. 
mandibles closed, antennae partially folded, she waits until 
the springtail, unaware of her presence, walks against her 
head. Then, seizing it with a quick snap of her mandibles, 
she quickly dispatches it with her sting. If, on the other 
hand, the springtail moves away from the ant, the latter 
repeats her approach. If the springtail shows no inclina- 
tion to move within a few minutes, the ant often acts as 
though impatient, and tries to examine it with her antennae, 
or to take it in her mandibles. 
Strumigenys (Cephaloxys) pulchella Emery 
We have found this species on about 15 occasions, each 
time in dead wood. A typical habitat seems to be a log or 
stump or dead portion of a tree trunk, well-decayed for 3 or 
4 cm. beneath the bark, moist but not wet, warm but not in 
full sun. Such desirable situations are almost always in- 
habited by species of Aphsenog aster, Lasius niger var. 
americanus Emery, or Camponotus herculeanus pennsyl- 
vanicus var. ferrugineus (F.). Whether S. pulchella is 
definitely associated with the other species, as is S. per- 
gandei, or whether it is simply a matter of such a situation 
being a very favorable one for other reasons, we have not 
determined. Although we have seldom taken pulchella 
workers in the frequented galleries of other ants, the colo- 
nies have seemed to be much more definitely associated with 
a larger species than chance alone would account for. 
Several times when logs and stumps were broken open 
pulchella workers were seen carrying dead springtails in 
their mandibles, and when kept in an artificial nest they 
readily captured and killed these insects. They would, 
however, accept bits of dead flies after having been starved 
for a few days. Their hunting methods are similar to those 
of S. pergandei, but the workers are less active. They walk 
less around the galleries and amid the woody debris pro- 
vided them and often crouch for hours at a cranny. When 
a springtail approaches, the worker merely lowers its head, 
turns in the direction of the quarry and waits. Only when 
the springtail touches the fore part of its head and man- 
dibles does the pulchella snap and seize it. Once a dead 
springtail was gently pushed close to a waiting pulchella 
worker. The latter crept up to about the length of its head 
away, then crouched, holding its antennae partially folded. 
