1923] Two New Mississippi Ants of the Subgenus Colohopsis 85 
with convex anterior and superior surfaces, the posterior dorsal 
edge of node centrally impressed as in the soldier; posterior 
surface flat, Gaster oblong. Legs as in the soldier. 
Body and appendages shining, distinctly shagreened, the 
head and thorax more coarsely than the gaster; the cheeks and 
upper surface of the head with scattered punctures. 
Head, legs and gaster covered with delicate white appressed 
hairs. Clypeus, front, vertex, tips of scapes and femora with a 
few long, scattered, hairs. 
Dark brown; head almost black, gaster black, thorax and 
appendages lighter than either. 
The specimens on which these descriptions are based were 
taken at Starkville, Mississippi, on January 7th, 1922, in the 
twigs of white ash, Fraxinus americana Linn. 
This seems to be a very common species of Colohopsis in 
Mississippi. In every instance observed it has been found 
nesting in the twigs of white ash. The ants mine out all of the 
soft portion of the twigs forming longitudinal galleries within 
the axes of the stems. The galleries may be from a few inches 
to over a foot in length. The young are reared within these 
galleries. Small entrance holes in diameter about the size of 
the soldiers’ heads lead from the outside of the twigs to the gal- 
leries within. There may be from one to several entrance holes 
to a nest. No soldiers have been observed using their heads 
to block these holes as has been noticed in other species of the 
genus. The female must undoubtedly construct her nest alone 
and rear the first brood to maturity unaided, as the writer has 
on a number of occasions found dead or live queens alone in small 
galleries. 
Colohopsis mississippiensis was so named because it is the 
most common species of the genus in Mississippi. It is very 
easily recognized by the deeply concave, truncated surface of 
the head. The sides of the truncated area are very sharp and 
well defined, except in the dorsal clypeal region. The head of 
this species when viewed from above has sides that are distinctly 
