MANN: THE ANTS OF BRAZIL. 469 



172. Aztcca schumanni Emery subsp. duhia, subsp. nov. 



Plate 2, fig. 15. 



Worker major. (Plate 2, fig. 15). Length 2 mm. 



Head subquadrate, one and a third times longer than broad, slightly 

 narrowed in front, with feebly convex sides, broadly rounded occipital 

 corners and narrowly excavated border. Clypeus convex, the anterior 

 border broadly bisinuate. Antennal scapes extending about two 

 thirds the distance to occipital corners; strongly arcuate and thick- 

 ened toward apex; funicular joints 5-10 as broad as long. Eyes at 

 sides of head, well in front of the middle. Pro- and mesothorax as in 

 A. schumanni. Epinotum in profile rounded; the posterior portion 

 of base flattened. Node in profile twice as high as thick, evenly 

 rounded above. Antennal scapes and tibiae without erect pile. 



Head, thorax, and abdomen with fine, long, appressed pubescence 

 and sparse, short, erect hairs. 



Color fuscous, thorax lighter, gaster darker. 



Worker minor. Length 2 mm. 



Head longer than broad, the width at occiput equal to that at 

 clypeus; sides slightly convex, posterior border very feebly concave. 

 Clypeus convex, the anterior border truncate at middle, slightly 

 produced and rounded at corners. Eyes small, located in front of 

 sides anterior to middle of head. Antennal scapes extending about 

 two thirds the distance to occipital corners, funicular joints 6-10 as 

 broad as long. Thorax and epinotum similar to that of the worker 

 major, but the latter is somewhat flatter. Node and gaster as in the 

 worker major. 



Subshining, finely punctate. Body above with sparse, short pile 

 and pubescence. Antennae and legs pubescent, without erect pile. 



Color fuscous. 



Male. Length 3.5 mm. 



Head about as long as broad; sides and posterior border convex. 

 Mandibles slender, acuminate. Anterior border of clypeus rounded. 

 Eyes rather large and convex. Ocelli prominent, the lateral ones 

 situated at opposite ends of a transverse elevated tubercle, which is 

 rounded in front and behind. Antennae short and stout; first and 

 second joints subglobose, transverse, the second the longest; third 

 joint one and a half times longer than broad, very much thickened; 

 joints 4-6 distinctly longer than broad, joints 7-12 proportionately 

 shorter; apical joint one and a half times as long as penultimate. 



