1934 ] 
Three New North American Ants 
189 
is a slave maker or a temporary social parasite. In view of 
the fact that parasitica is smaller than bradleyi and has no 
mandibular specialization which might offset this disadvan- 
tage it seems more likely that the new species is a temporary 
social parasite. 
Because of the close correspondence of general morpho- 
logical characteristics it can scarcely be doubted that para- 
sitica has been derived from bradleyi. It differs from brad- 
leyi , however, in the following respects: the epinotum is 
lower and less angular, the node of the petiole is lower and 
more rounded, the sculpture is more feeble as even the most 
heavily sculptured individuals of parasitica never approach 
the heavy sculpture characteristic of bradleyi , the thorax and 
petiolar nodes are black (reddish yellow in bradleyi ), the 
hairs are stouter, more uniformly erect and considerably 
more numerous on the ventral surface of the head. 
Aphaenogaster (Attomyrma) liuachucana sp. nov. 
Worker: Length: 4.5-7 mm. 
Head exclusive of the mandibles one and one half times as 
long as broad, the sides subparallel in the anterior two- 
thirds but narrowing sharply in the posterior third. Occi- 
pital border flat, less than half as wide as the greatest width 
of the head and bordered by a narrow but very distinct re- 
flected flange. Clypeus moderately projecting, the anterior 
border sinuate with the median impression in some speci- 
mens broad, shallow and evenly concave, in others deeper, 
and more narrow with a distinct notch in the middle. 
Median lobe of the clypeus rather flat, ecarinate, not sharply 
marked off from the lateral portions and with an evenly 
rounded posterior border between the frontal carinse. 
Frontal area only slightly depressed, shining with a promin- 
ent median carinula. Mandibles slender, the external mar- 
gin straight except near the tip where it turns inward sharp- 
ly and is convex. Outer third of the masticatory margin 
armed with three prominent teeth which decrease in length 
from the terminal tooth inward, the remainder of the mas- 
