330 THE CANADIAN ENTOMOLOGIST. 



Mandibles simple, edentate ; third joint of the antennee obconical, 

 hardly longer than thick at apex. 

 (Africa.) Odontomutilla, Ashmead. 



41. Thorax not hexagonal, usually obpyriform, obovoid, obtrapezoidal or 



violin-shaped 42. 



Thorax distinctly hexagonal, widest at the angles a little before the 

 middle, squarely truncate anteriorly. 



Head quadrate, the temples broad ; eyes oblong-oval. 



(Africa.) Xenomutilla, Ashm., gen. nov. 



(Type Mutilla eurydice, Pering.) 



42. Thorax not much elongate, less than thrice as long as wide 43. 



Thorax much elongate, obpyriform, at least thrice as long as wide, or 



even longer ; pygidium towards apex usually smooth, shining, the 



pygidial area nearly obliterated. 



Thorax more than thrice as long as wide, coarsely pitted or 

 rugose, the front margin rounded, the lateral margin with a 

 triangular tooth before the middle ; second ventral segment 

 with a median tooth ; head subquadrate, hardly as wide as the 

 thorax, rounded beh'nd, the temples broad; mandibles 

 acuminate at apex, but with a tooth within near the middle, 

 usually not visible when the mandibles are closed. 



(Africa.) Dolichomutilla, Ashmead. 



Thorax about thrice as long as wide, but not coarsely sculptured, 

 the front margin squarely truncate, the lateral margins without a 

 tooth ; second ventral segment unarmed ; head transverse, 

 not wider than the thorax, the temples narrow ; mandibles 



acuminate, edentate. (Asia.) Promecilla, Andre. 



(Type Mutilla regia. Smith.) 



43. Thorax obpyriform, obovoid or subtrapezoidal, narrowed posteriorly. 



Thorax subtrapezoidal ; head subquadrate, rounded behind, the 

 temples broad; eyes small, oval ; mandibles arcuate, acuminate. 



(Africa.) Brachymutilla, Andre. 



Thorax obovoid or obpyriform. 



Head quadrate, the temples broad ; eyes ellipsoidal ; mandibles 

 conically-pointed ; third antennal joint longer than the fourth, 

 but not twice as long as thick. (North 

 America.) Morsyma, Fox. 



