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Annals Entomological Society of America [Vol. XII, 



the basal lobe small. Antennae short, flattened, the scape elliptical, 

 scarcely more than twice as long as broad; fmiiculus with distinct 

 3-jointed club, first joint longer than broad, joints 2-7 small, transverse, 

 terminal joint a little longer than the two preceding joints together. 

 Thorax regularly oblong, two and one-half times as long as broad, a 

 little narrower than the head, with straight parallel sides, blunt anterior 

 comers and concave posterior border, representing the boundary between 

 the base and declivity of the epinottmi which is square. The dorsal 

 surface is flattened, bluntly submarginate on the sides, the pleurae 



Fig. 6. Metapone tillyardi sp. nov. Worker, a, dorsal; b, lateral view. 



concave. There is an extremely faint trace of a promesonotal suture ; 

 mesoepinotal suture distinct, rather sharply impressed, especially on 

 the sides. In profile the thorax is about two and one-half times as 

 long as high, vertically trtmcated anteriorly and posteriorly, the latter 

 truncation being the epinotal declivity, the sides of which are marginate 

 but not swollen above. Petiole from above as broad as the epinotum 

 and twice as broad as long, narrower in front than behind, with straight 

 anterior and lateral borders and broadly excised posterior border, the 

 posterior corners flattened and lobe-like; in profile the segment is trun- 

 cated anteriorly and posteriorly, with the anterior and lateral surfaces 

 strongly concave, the ventral surface bearing a single stout, triangular 



