ATJSTRALL\N HONEY-ANTS. 



271 



Sept. 1905, p. 23; Emery, Genera Insect. Fasc. 137, 1912, p. 17; Stitz, 

 Sitzber. Ges. Naturf. Freunde Berlin, 1912, p. 507 y . 



Worker. Length: 9-12 mm. 



Head, excluding the mandibles, less than twice as long as broad, 

 rather robust, broadest just behind the eyes, the lateral borders in 

 front of the eyes straight and slightly concave, behind the eyes convex 

 and but slightly narrowed at the occipital border, which is broad and 

 straight when the head is seen squarely from above. Eyes rather 

 small, situated half way between the anterior border of the cheeks 



Figure 6. a. Leptomyrmex nigriventris Guerin, worker, with gaster in 

 position in which it is usually carried; b. head of same from above. 



and the posterior border of the head. Apical border of mandibles 

 with about 20 crowded, irregular denticles. Anterior clypeal border 

 impressed in the middle. Antennal scapes extending only a little over 

 half their length beyond the posterior border of the head. Pronotum 

 rather robust, only 1^ times as long as broad. Base of epinotum 

 somewhat concave in profile. Petiolar node rather high, its summit 

 and anterior surface convex and rounded, with a distinct median longi- 

 tudinal impression; posterior surface longer, concave. Gaster rather 

 broad, elliptical. Femora and tibise distinctly compressed. 



