1939] 
Notes on Strumigenys 
101 
After waiting in this position for a considerable time, it 
rose, extended its antennae and vibrated them rapidly, then 
crouched again. This was repeated two more times before 
the ant, as if impatient after % of an hour, walked up to the 
springtail and seized it. 
Winged phases were taken from nests in mid August. 
Strumigenys (Cephaloxys) missouriensis M. R. Smith 
Four colonies and numerous stray workers were found in 
a cedar thicket in western Pike County. The first workers 
were seen in and around some little-used gallaries of 
Aph senog aster fulva aquia var. picea Emery under a small 
stone, and the colony was located about 30 cm. away just 
beneath the humus. Two other colonies were likewise in 
the soil, not more than 4 cm. below the surface. The latter, 
however, were not visibly associated with any other ants. 
Scattered, stray workers were found just under the top 
layer of the humus. The cedar grove was located on the 
gently sloping base of a hill. Mingled with the cedars were 
a few small oaks and an occasional maple sapling. The soil 
was a black clay from 5 to 15 cm. deep above the limestone 
bed rock. Above the clay was a thick, springy layer of 
loose decaying cedar needles, leaves and grass. Abounding 
in this debris were Ponera coarctata subsp. pennsylvanica 
Emery, Myrmecina graminicola (Latr.) subsp. and hordes 
of Collembola, as well as Strumigenys. Here, in an area of 
3 by 9 meters, were found S. missouriensis M. R. Smith, S. 
manni new species, S. deitrichi M. R. Smith, and S. venatrix 
new species. 
On careful comparison of our specimens with 2 worker 
cotypes loaned by Dr. M. R. Smith, we find that, although 
some of the workers agree closely with the cotypes, there is 
quite a perceptible amount of variation both among workers 
from the same colony and among the 4 colonies found. This 
variation lies almost entirely in the direction of forms which 
differ from the cotypes in the following details: (1) the 
head is slightly more robust; (2) the clypeus is slightly 
depressed in the middle; (3) the antennal scapes are some- 
what more angulate; (4) the sculpture is distinctly coarser; 
(5) the hairs on the head are larger, especially on the 
clypeus, and are fewer in number. 
