244 PROCEEDINGS OF THE ACADEMY OF [Feb., 



^'ery dark-brown, almost black. ]\Iandibles, neck, funiculus and 

 legs yellow; scape and club of antennae and the middle of the femora 

 and tibise infuscated; edges of mandibles black. 



Type locality: Canon City, Colo. 



Described from four specimens collected by Rev. P. J. Schmitt, 

 O.S.B., to whom I take pleasure in dedicating this very striking species. 

 It is quite unlike any of the other described North American forms 

 in the shape of the thorax and petiole and the smoothness of the head, 

 pro- and mesonotum. 



11. Leptothorax nitens Emery. 



L. nitens Emery, Zool. Jahrb. Abth. f. Syst., VIII, 1S94, pp. 318, 322, 323. 

 Worker (PI. XII, fig. 15).— Length 2-2.25 mm. 

 Mandibles 5-toothed; basal teeth very small. Clypeus moderately 

 convex, impressed in the middle and with sinuately excised anterior 

 border. Antennae 12-jointed ; scape reaching to | the distance between 

 the eye and the posterior angle of the head ; funiculus terminating in a 

 distinctly 3-jointed clul), the two basal joints of which are subequalin 

 length, together decidedly shorter than the terminal joint ; first funicular 

 joint as long as the three succeeding joints together, joints 2-7 of the 

 funiculus slightly broader than long, the 8th about as long as broad. 

 Thorax slender, somewhat broader in front than behind ; compressed 

 laterally, pronotum rather prominent and square in front, humeri 

 rounded ; in profile the dorsal surface is somewhat flattened and with- 

 out mesoepinotal constriction. Epinotal spines very small, tooth- 

 like, hardly as long as broad at their bases, directed upward, about as 

 far apart as they are broad at their leases. Petiole about 1^ times as 

 long as broad, gradually widened behind when seen from above; in 

 profile the node is very high, its anterior slope steep and concave, its 

 summit very short and rounded, the posterior slope abrupt, the ven- 

 tral tooth is distinct and pointed forward and downward. Petiole 

 nodiform, a little broader than long, half again as broad as the petiole, 

 its anterior angles much rounded. Gaster of the usual shape. 



Mandibles smooth and shining, indistinctly striated and punctate. 

 Clypeus smooth and shining, with a few longitudinal rugse on its antero- 

 lateral surfaces. Head very smooth and shining, minutely and sparsely 

 punctate; sides of front, antennal fovese and cheeks longitudinal rugu- 

 lose. Thorax, petiole and postpetiole opaque, finely and regularly 

 foveolate-reticulate. In some specimens more or less of the pro- and 

 mesonotum is shining . Pleurse faintly striated longitudinally. Gaster 

 very smooth and shining. 



Hairs moderately abundant, yellow; clavate on crown of head, thorax 



