1923] Two New Mississippi Ants of the Subgenus Colohopsis 83 
for one to confuse them. C. impressus, which has a head with 
distinctly parallel sides, can easily be distinguished from the 
other two species both of which have heads with the sides diverg- 
ing anteriorly. 
In this section of the state C. pylartes fraxinicola and C. 
mississippiensis nest in the twigs of white ash, Fraxinus ameri- 
cana Linn, and are rather common species, particularly the latter, 
which can be found in the twigs of ash with very little effort. 
Without doubt these species must feed to a large extent if not 
altogether, on the honey dew excreted by aphids, scale insects, 
etc. for the writer has on a number of occasions seen the workers 
lapping up this substance from the leaves of trees and plants. 
C. mississippiensis seems to breed here thruout the winter. 
Nests examined at various dates during the season always con- 
tained eggs and larvae. Since the winters in Mississippi are 
rather mild and the ants are well protected from exposure, this 
is to be expected. 
The writer is very grateful to Dr. W. M. Wheeler for ex- 
amining the specimens described here and for reviewing the 
technical descriptions. To Professor R. W. Harned the writer 
wishes to express his appreciation for encouragement given in 
the study of these and other Mississippi ants and for the generous 
allotment of time for such work. 
Colobopsis mississippiensis sp. nov. 
Soldier. Length, 4.5 — 5mm. 
Head subcylindrical, from above rectangular, longer than 
broad, sides divergent anteriorly, occipital border convex, 
anterior truncated surface deeply concave, its edges sharply 
marginate along the sides but less so in the clypeal region. 
Mandibles small, with flattened ventral surfaces, 4-toothed with 
a short toothless proximal portion to the blade. Clypeus on the 
truncated surface about one and a half times longer than broad, 
upper portion on the truncated area more divergent than the 
lower portion. There is a distinct median keel running the full 
