1939] 
Notes on Strwmigenys 
95 
hairs on thorax irregular, long, thin, not clavate, the ma- 
jority subappressed ; gaster bearing 2 or 3 long hairs, 
usually near the base, a number of shorter hairs at the tip. 
Spongiform processes as in S. clypeata and related species. 
Color dark ferruginous, the appendages slightly lighter, 
the gaster darker. 
S. medialis possesses the general characteristics of S. 
clypeata and the species related to it. It may readily be 
separated from other forms, however, by (1) the longer 
mandibles, which are 1/4 to y§ the length of the head; 
(2) the more narrowly rounded clypeus, the surface of 
which is subopaque; (3) the pilosity of the clypeus, the 
hairs of which are longer, erect, feebly squamose and 
sharply curved apically, and (4) generally by the pilosity 
of the rest of the head and antennal scapes. 
Type locality: Beaver, Pike County, Ohio. 
Described from a colony of about 30 workers and several 
dealate females taken from the hickory log described above 
under S. deitrichi. The nest consisted of irregular cavities 
in the outer rotten portion of the log which appeared to be 
old galleries of beetle larvae. The colony was transferred 
to an artificial nest where, as did other species of Strumi- 
genys we have had under observation, they fed on living 
springtails. In their hunting they were quite inactive, even 
more so than S. pulchella; the workers would remain in a 
crouching position, head close to the substratum, mandibles 
closed, antennae partially folded, for a great deal of the 
time. Occasionally some of the dealate females were ob- 
served hunting like the workers. Otherwise the hunting 
methods of this species resembled those of S. pergandei. 
Strumigenys (Cephaloxys) bimarginata, sp. n. 
Worker: (PL 3, fig. 2) : Length, 1.7 mm. 
Head, exclusive of mandibles, 3.3 times the greatest width 
of the clypeus, 5.7 times the length of the exposed portion of 
the closed mandibles. Viewed anteriorly, the sides of the 
head anterior to the antennal insertions are straight, con- 
verging, their projections lying along the exterior border of 
the closed mandibles; clypeus rather narrow but evenly 
rounded, not acute, flattened dorsally; clypeus viewed from 
