178 Annals Entomological Society of America [Vol. XII, 



Key to Metapone Species. 



1. Clypeus with a narrow, projecting, rectangular anterior lobe, transversely 



truncated in front, concave at the sides, with acute tooth-like corners. . . .2. 



Clypeus scarcely projecting anteriorly, without distinct lobe, bluntly or 



obscurely bidentate 5. 



2. Petiole broader than long, its posterior corners blunt, flattened and lobular; 



postpetiole transversely elliptical or sub-elliptical; color brown 3. 



Petiole much longer than broad, its posterior corners produced as somewhat 

 diverging teeth which are longef than broad at their bases; postpetiole 

 subrectangular; color black, with red or brown gaster 4 



3. Mandibles 4-toothed; mesoepinotal suture very distinct and impressed; pos- 



terior corners of epinotum not swollen; sculpture of head and thorax rather 

 coarse; brownish red, with castaneous gaster, female darker; length 5.9-8.9 



mm greeni Forel . 



Mandibles 5-toothed; mesoepinotal suture indistinct; posterior corners of 

 epinotum swollen; sculpture of head and thorax finer; pale brown, head 

 darker; length, 7.6 mm nijbbergi Forel. 



4. Body not greatly flattened; length 10.5-11.1 mm.; petiole and postpetiole 



longitudinally striate; black, with dark brown gaster saiUeri Forel. 



Body much flattened; length 6.5-7 mm.; petiole transversely striate, post- 

 petiole smooth; apical mandibular teeth smaller than the basal; brown 

 black, with ferruginous red gaster lece sp. nov. 



5. Mandibles 5-toothed; posterior clypeal suture distinct; head and thorax longi- 



tudinally striate; petiole broadly and feebly excised behind; legs short, 

 femora very broad; head and thorax castaneous; gaster and legs ferrugineous; 

 length 5.5-6 mm tillyardi sp. nov. 



Mandibles 4-toothed; posterior clypeal suture obsolete; body very smooth apd 

 shining; petiole longer, deeply and angularly excised behind; legs longer, 

 with narrower femora; black, with dark reddish brown legs; length 6.4 

 mm bakeri Wheeler. 



