— 229 — 



promesonotal constriction is very pronounced in the latter sex 

 and the wings must be fuliginous or blackish in mature speci- 

 mens. 



Mayr described the species from a single specimen of an 

 unknown provenience. He supposed that it must have come from 

 South America. It has not since been recognized, so far as I am 

 able to ascertain, and is not mentioned in Forel's account of the 

 Formicidae in the " Biologia Centrali-Americana. „ 



4. — Leptogenys (Lobopelta) consangninea sp. nov. 

 Woj'ker. Length 5-5. 3 mm. 



Head fully a third again as long as broad, broader in front 

 than behind, with parallel cheeks , straight but converging post- 

 ocular borders and slightly excised posterior border. Eyes rather 

 small, flattened, in front of the middle of the head. Mandibles 

 somewhat more than half as long as the head, slender, edendate, 

 their blades with apical and basal borders forming with each 

 other a very large and indistinct obtuse angle. Clypeus strongly 

 cannate, pointed, projecting forward and filling the space be- 

 tween the closed mandibles, its median portion forming a lobe sep- 

 arated on each side by a notch from the remainder of the cly- 

 peus. Antennae long and robust; scapes projecting somewhat less 

 than 1/3 their length beyond the posterior corners of the head; 

 all the funicular joints decidedly longer than broad, second joint 

 but little longer than the third. Thorax long and slender, narrower 

 than the head; pronotum and base of epinotum flattened abo- 

 ve, horizontal; mesoepinotal depression distinct but shallow. Base 

 of epinotum about six times as long as the declivity, the lat- 

 ter concave and bounded below by a transverse ridge which ter- 

 minates on each side in a small tooth or tubercle. Petiole from 

 above fully 1 1/2 times as long as broad, laterally compressed, 

 not as high as the first gastric segment; in profile with short, 

 abrupt anterior surface passing into a dorsal surface which is e- 

 venly rounded and slopes upward. This at its posterior end sud- 

 denly passes through a distinct but rounded angle into the pos- 

 terior surface which is very abrupt and slightly concave. Gaster 

 and legs of the usual shape. Claws simple, straight and very 

 slender. 



