56 Journal New York Entomological Society. [Voi. vii. 



Head quadrate or subquadrate ; mandibles beneath entire, acuminate, eden- 

 tate or with one or two small teeth within before apex ; body most fre- 

 quently bare or nearly bare, more i-arely with a short dense pubescence, 

 generally confined to the abdomen NomiaephagUS Asliin. g. n. 



Head transverse ; mandibles beneath with a sinus or emargination on 

 basal one-fourth or third, apex acuminate with a slight tooth within be- 

 fore tip ; body clothed with a dense pubescence. 



(Type S. authophone AsHM. ) Pyrrhomutilla Ashiii. g. n. 



7. Thorax fully as wide as long, hexagonal ; head subglobose, much narrower than 



the thorax ; mandibles simple, acute at apex, edentate ; maxillary palpi 5-jointed, 



labials 3-jointed (Australia) Eurymutilla Ashm. g. n. 



Thorax almost quadrangular, about I J2 times as long. as wide, or a little longer, only 

 slightly narrower posteriorly than anteriorly ; head transverse or subglobose ; eyes 

 somewhat rounded or very short oval ; mandibles with an emargination beneath, 

 pointed at apex, edentate ; first joint of flagellum not or scarcely longer than 

 wide, shorter or very little longer than the third; body almost bare. 



Photopsis Blake 

 Thorax obpyriform, about twice as long as wide ; head subquadrate or subglobose 

 eyes short oval or rounded. 



Mandibles excised beneath Tricholabiodes Radoszk. 



Mandibles not excised beneath Sphaerophthalma Blake (pars) 



8. Thorax obpyriform, or at least always narrowed posteriorly, never c}uadrangiilar or 



cubical, often hexagonal or fiddle-shaped, the lateral margins not parallel, the 



dorsal profile most frequently arcuate or convexly rounded 9 



Thorax quadrangular or cubiform, not narrowed posteriorly, usually abruptly or al- 

 most perpendicularly truncate behind, the dorsal profile straight or nearly, the 

 lateral margins parallel or nearly, rarely with a slight inward curve medially. 

 Head subquadrate ; eyes oval, distant from base of mandibles ; antennal fove?e 

 bounded by a carina superiorly ; mandibles simple, with a slight tooth within 

 before apex ; first joint of flagellum longer than joints 2-3 united ; meta- 

 thorax with a prominent median tooth or spine above Konisia Costa. 



9. Antennal fovese deep, distinct, and bounded by a carina superiorly 10 



Antennal foveae rather shallow, not bounded by a carina superiorly II 



10. Head subc|uadrate, transverse or subglobose. 



Eyes round, far from base of mandibles ; mandibles not excised beneath, 

 simple, edentate or with a slight tooth within before apex. 



Sphaerophthalma Blake. 



Eyes short oval or round ; mandibles sinuate or excised Ijeneath with usually a 

 small tooth within before apex Tricholabiodes Radoszk. (pars) 



11. Pygidium not smooth, often longitudinally striated or rugulose, and always tvitli 



a distinct pygidial area 12 



Pygidium smooth, without a pygidial area. 



Thorax only about twice as long as wide, unarmed ; head subquadrate, not wider 

 than the thorax ; eyes short oval, nearly round, the malar space as long as the 

 eye ; mandibles with a tooth within before apex ; first joint of flagellum ob- 

 conical, longer than the second Stenoitiutilla Andi-e. 



