1 7 6 



WILLIAM MORTON WHEELER. 



than the head, elongate, broadest through the pronotum, which 

 in profile is rounded in front and straight and horizontal behind, 

 where its outline is continued into the straight, horizontal outline 

 of the mesonotum. There is no mesoepinotal constriction but 

 there are very small though distinct scutellar and metanotal 



a 



d 



FIG. 7. Oligomyrmex panamensis sp. nov. a, head of soldier (or ergatoid?), 

 dorsal aspect; b, thorax and pedicel of same, dorsal aspect; c, same, in profile; d, 

 head of worker, dorsal aspect. 



sclerites. The epinotum is subrectangular in profile, with an 

 abrupt declivity shorter than the straight horizontal base. The 

 angle on each side is formed by a ridge which is most distinct on 

 the declivity. The surface between the two ridges is slightly 

 concave. Petiole with a very short peduncle, which bears a 

 strong, forwardly directed anteroventral tooth. The node is 

 large and rounded, with rather steep, straight anterior and more 

 abrupt, rounded posterior slope; from above it is transversely 

 elliptical and nearly as long as broad. Postpetiole lower than the 

 petiole, convex above, with a large, rounded tubercle on each 

 side below and a minute anteroventral denticle. From above 

 this segment is nearly if times as broad as the petiolar node and 

 of a similar shape. Caster about the size of the head, elliptical, 



