64 
William Morton Wheeler 
The petiole is as long as high in profile; its node angular, with 
subequal anterior and posterior slopes, both slightly concave. Seen 
from above the postpetiole is broader than long and a little broader 
than the petiole. The mesoepinotal constriction is fully as distinct 
as in the recent L. acervorum. The mandibles are very coarsely punc- 
tate, the cheeks longitudinally reticulate-rugose, the remainder of the 
head, the thorax, including the epinotal declivity, the petiole and post- 
petiole uniformly and densely punctate, and not rugulose-punctate as 
stated by Mayr. The type specimen is black, and this is also the 
color of a few other specimens I have seen, but most of them in a 
better state of preservation are red or ferruginous. The hairs on the 
body are blunt, those on the gaster being clavate as in most of the 
recent members of the genus. 
I have examined the following specimens of this species : 24 workers 
in the Geolog. Inst. Koenigsberg ColL: (7655/369 [Mayr’s type], XXB 
1229, 3784/132, XXB 6694, XXB 854, B 256, B 241, B 19462, 
XXB 587, XXB 1498 and 14 without numbers), three males from 
the same collection (10248/641 [Mayr’s type], XXB 555 and B 19468) 
and five workers and a male in the Klebs collection (K 2994, K 843, 
Iv 4479, K 5611, K 5805 and K 813). 
Leptothorax glcesarius, sp. nov. 
Worker. Length nearly 2 mm. 
Closely resembling L. gracilis > but differing in its smaller size 
and in the following characters: The epinotum, instead of spines, 
bears two teeth whieh are not longer than broad at their bases. The 
petiole has on its anteroventral surface a large, pointed tooth, which 
is directed downward, and the node in profile is blunt and rounded 
above and behind, with only the anterior slope concave. The antennse 
are 12-jointed as in gracilis and the thordx is impressed at the 
mesoepinotal suture. The sculpture is also much as in this species, 
except that the humeri of the pronotum are coarsely reticulate-rugose. 
Erect hairs are visible on the body, but though blunt are slender 
and not clavate. The hairs on the scapes and legs are very short 
and appressed. The color is red beneath a golden air film which 
covers much of the body. 
Described from a single worker (without a number) in the Geolog. 
Inst. Koenigsberg Coli. 
