S3^ Bulletin American Museum of Natural History. [Vol. XXII, 



Worker. Length 3-3.25 mm. 



Head longer than broad, elHptical, narrowed but not conical behind the 

 eyes; without posterior angles and with a constricted and marginate posterior 

 border. Eyes a little in front of the middle of the head. Mandibles with two 

 larger apical teeth and numerotis smaller basal teeth. Anterior clypeal border 

 sinuately excised in the middle. Antennas very slender; scapes extending about 

 § their length beyond the posterior corners of the head; funicular joints like 

 those of the soldier. Thorax long and narrow, flattened above, with indistinct 

 promesonotal depression; mesoepinotal depression short and deep. Epinotal 

 spines small and acute, directed upward and somewhat outward, nearly twice 

 as far apart at their bases as long. Petiole slender, fully three times as long as 

 broad, very little wider behind than in front, with subparallel sides; in profile 

 with a short, rounded node near the posterior end. Postpetiole barely twice as 

 broad as the petiole, as long as broad, subglobular. Gaster about the size of 

 the head. Legs very long and slender. 



Body smooth and shining. Mandibles indistinctly punctate. Epinotum 

 and mesopleurae subopaque, evenly punctate. 



Pilosity like that of the soldier but less abundant. 



Dark brown or piceous; mandibles and clypeus yellow; mandibular teeth 

 black; legs somewhat paler than the body. 



Female (dealated). Length 6.5-7 "^"^• 



Head resembling that of the soldier, but the longitudinal rugee and the punc- 

 tation extend onto the posterior corners, so that these are subopaque. Clypeus 

 depressed in the middle, sharply carinate and longitudinally rugose. Antennal 

 scapes as long as those of the soldier but distinctly incrassated and slightly 

 flattened at their bases. Epinotum with short, robust spines, its sides irregularly 

 and longitudinally striated, the region between the spines with dense, shallow 

 punctures. Mesonotum smooth and shining, with a finely, longitudinally and 

 coarsely punctate area on either side of the middle line. Scutellum coarsely 

 and sparsely punctate, with a few striae running parallel with the posterior 

 border. Petiole and postpetiole opaque, very finely punctate; the former 

 twice as broad as long, semicircular in outline from above, in profile with an 

 acute node, the posterior surface of which is strongly concave. Gaster shining, 

 shagreened, especially at the base, and with scattered piligerous punctures. 

 Color and pilosity similar to those of the soldier. 



Male. Length 4.5-5.5 mm. 



Head, excluding the eyes, longer than broad. Cheeks extrernely short, 

 ocellar region very prominent, with straight posterior border. Mandibles very 

 small, with two larger apical and three or four minute basal teeth. Clypeus 

 feebly emarginate in the middle. Antennae filiform; scape somewhat longer 

 and stouter than the subequal, cylindrical joints 2-12 of the funiculus; first 

 joint subspherical, scarcely broader than the scape. Thorax very robust, 

 nearly twice as broad as the head including the eyes; mesonotum flattened, a 

 little broader than long, without Mayrian furrows. Epinotum short, sloping, 

 with small protuberances in the place of the spines. Petiole i^ times as long as 

 broad, broadest behind; node rather sharp in profile, with longer, concave, 

 anterior and shorter, concave posterior slopes. Postpetiole i^ times as broad 



