1939] 
Notes on Strumigenys 
99 
characters too numerous to mention. It is distinguished 
generally by (1) the decidedly truncate appearance of the 
clypeus; (2) the long and robust mandibles; (3) the 
mandibular dentition; (4) the relative prominence of the 
node of the petiole; (5) the character of the pilosity of the 
head and thorax; (6) the shorter terminal joints of the 
antennae. 
Strumigenys (Cephaloxys) rostrata Emery 
Jackson, Pike, Ross and Scioto counties. 
We have taken this species in both soil and wood, some- 
times in decidedly dry situations. Three colonies were 
found respectively in the hickory log mentioned under S. 
deitrichi, the decaying portion of a large elm tree in which 
also lived a colony of Aphaenog aster tennesseensis Mayr, 
and in a crevice in a stump in a wooded pasture, a few centi- 
meters from another colony of A. tennesseensis. 3 colonies 
were taken on the edge of some dry oak woods, all in or 
on the humus just under the dry oak leaves, which, with 
some grass and herbs, covered the ground. The nesting 
site of one was a rotten hickory nut ; the second was in some 
cavities in a .small decayed stick ; the third was living in a 
crevice of a partly buried board. Workers were found 
under the leaves in the vicinity of the nests, presumably 
foraging. They were not apparently associated with any 
other ants. A few dead springtails were found in one of 
the nests. On one occasion a colony of rostrata was found 
living in a chamber in dry soil under a stone. Under the 
stone there also ran a few galleries of Lasius umbratus 
mixtus var. aphidicola (Walsh). 
A rostrata colony was transferred to an artificial nest for 
observation. While employing the same general methods 
of hunting springtails as the other species studied, the 
rostrata workers differ in being more active. Instead of 
crouching in one spot awaiting the advent of a springtail, 
they spend most of their foraging time moving over the 
debris in the nest. When a worker scents a springtail 2 or 
3 mm. away, she crouches, and, without touching it, tries 
various avenues of approach until she is so close that her 
mandibles almost touch the springtail. Then, head lowered, 
