Mar. 1899.1 ASHMEAD : On SyNOPSES OF FAMILIES OF HyMENOPTERA. 53 



Thorax in outline not rounded. 



Abdomen without a constriction between segments 2 and 3 4 



Abdomen with a strong constriction between segments 2 and 3. 



Apterogyna LatreilU. 



4. Thorax quadrate, the sides from pronotum parallel ; head very large, quadrate, 



wider than the thorax ; mandibles long, bidentate at apex, siiiuated or subemar- 



ginated beneath ; pygidium without a pygidial area Brachycistis Fox. 



Thorax not cjuadrate, quite differently shaped. 

 Eyes oval, slightly sinuate on outer margin superiorly. 



Abdomen sessile ; pronotum transverse, a little wider than the meso-metan- 

 otum anteriorly but not wider than the same posteriorly, the sides being 



compressed just behind the pronotum Miliuta Andre. 



Eyes round or rounded. 



Abdomen subpetiolate, the petiole enlarged towards apex with a strong con- 

 striction between it and the second segment ; pronotum large, nearly 

 obtrapezoidal and fully as wide or a little wider than the mesometathorax. 

 (Type M. peculiaris Cr.) Typhoctes Ashm. g. n. 

 Abdomen with a distinct, slender petiole ; pronotum campanulate, much 

 narrower than the meso-metathorax Cyphotes Blake. 



5. Stigma and marginal cell distinct 7 



Stigma and marginal cell wanting 6 



Stigma present, narrow, elongate, the marginal cell wanting, front wings with only 



the median cell distinct ; antennae very long, filiform ; abdomen ovate, with a 

 very short petiole ; pygidium tridentate at apex. 



Brad> nobsenus Spiuola ( ;= Chestus Spinola). 



6. Abdomen subpetiolate, with a strong constriction between the second and third 



segments ; front wings with one very small submarginal cell and a median and a 

 submedian cell ; abdomen ending in an aculeus Aptero^yna LatreiUe. 



7. Abdomen ending in an aculeus which ciu-ves upwards ; front wings with a short 



marginal cell 8 



Abdomen unarmed at apex, without an upward curved aculeus. 

 Front wings with three subrharginal cells. 



Marginal cell long, and with four submarginal cells, the second and third 



each receiving a recurrent nervure Myrmosa Latreille. 



Marginal cell rather short, triangular, the second submarginal cell triangular, 

 receiving the first recurrent nervure near the middle, the third submarginal 

 cell hexagonal ; eyes large, extending to base of mandibles with an emar- 

 gination within Ephutomma Ashm. g. n. 



8. Middle tibiae with 2 apical spurs 9 



Middle tibiae with i apical spur. 



Front wings with three submarginal cells, the second and third each receiving a 

 recurrent nervure ; cubitus in hind wings interstitial or nearly, with the 

 transverse median nervure ; mesonotum with furrows. 

 Abdomen with a more or less distinct constriction between the first and sec- 

 ond segments ; scutellum rounded, subconvex ; first recurrent nervure 

 usually joinijig the second submarginal cell before the middle ; mandibles 

 tridentate Brachycistis Fox. 



