34 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 Mayk. 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, 

 K 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 which 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 antennae 

 are 12-jointed as in gracilis and the thornx 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 Coll. 



