1934 ] 
A New Strumigenys 
63 
A NEW STRUMIGENYS FROM ILLINOIS 
(HYMENOPTERA: FORMICIDiE) 
By Neal A. Weber 
Harvard University 
The ant here described was obtained through Dr. M. R. 
Smith from the Illinois Natural History Survey. It proves 
to be the sixteenth Nearctic species of a small and incon- 
spongiform processes on the pedicel and, in many forms, by 
development in the tropics. The members of this genus are 
found chiefly in rotted wood on the ground or in damp 
soil under stones and are comparatively rare and little- 
known. They are noteworthy in the possession of six- 
jointed antennae, peculiar and diverse pilosity, strange 
spongiform processes on the pedicel and, in many forms, by 
a great development of the mandibles. 
Strumigenys (Cephaloxys) talpa n. sp. (Fig. 1) 
Worker: Length 1.8 mm. 
Head 0.56 mm. long, cordate, shallowly excised at the 
posterior margin, occipital margins rounded, sides anterior 
to the antennal insertions converging gently to the mandi- 
bles ; clypeus with evenly rounded anterior margin and 
posterior angle obtuse ; exposed part of mandibles less than 
Vs the length of the remainder of the head, outer margins 
convex, inner margins armed at the apical % with about 
6 acute teeth and at the apex with several smaller acute 
teeth, armed at the base with a single large acute tooth ; 
antennal scapes extending posteriorly to the maximum 
breadth of the head, evenly bent inwards at the base ; 1st 
joint of the funiculus distinctly longer than the 2nd and 3rd 
together and about equal in length to the 4th alone, terminal 
joint distinctly longer than the preceding joints of the funi- 
culus together. Thorax, in profile, evenly convex, mesoepin- 
otal suture faintly indicated ; epinotal spines acute, low, 
directed backwards and slightly upwards ; infraspinal lam- 
