Mar. 1899.] 



AsHMEAD : On SvxVoPiES OF Families of Hvmenoptera. 55 



Lateral margins of the metathoracic truncature normal, rarely dentriculated ; 

 anterior tarsi with a long, stiff tarsal comb. 

 Lateral margins of the thorax straight, parallel ; head large, quadrate, 

 usually much wider than the thorax ; mandibles at apex tridentate, 



the outer tooth the longer, acute Vlutilla Linne. 



Lateral margins of the thorax usually slightly curved inwardly medially, 

 therefore not exactly parallel ; head subquadrate not or scarcely wider 

 than the thorax; mandibles simple, narrowed towards apex, dentate or 

 at most with a slight tooth within before apex ; maxillary palpi long, 

 6-jointed, labials 5-jointed ; third joint of antenna; thicker toward 

 apex, as long as joints 4-5 united. 



(Type M. diibitata Smith) Timulla Ashm. 

 Lateral margins of the metathoracic truncature dentate, or denticulated ; an- 

 terior tarsi with a short tarsal comb ; mandibles simple without a tooth 

 within ; maxillary palpi long, 6-jointed, labials 4-jointed, joints 2-4 com- 

 pressed, the second wider than long ; first joint of tlagellum obconical, not 

 longer than wide at apex. (Africa.) 



(Type 0. abhottii h^\vs\. ms. ) Odontomutllla Ashm. g. n. 



5. Antennal fovea: shallow, not bounded by a carina superiorly 7 



Antennal fovece bounded by a distinct carina superiorly. 



Eyes round, prominent, distant from base of mandibles o 



Eyes prominent, oval, ovate, or elliptical. 



Pygidium smooth, without a pygidial area ; thorax very elongate, more than 

 thrice longer than wide, coarsely pitted or rugose, the anterior margin 

 rounded, the lateral hind angles of the mesonotum produced outwardly into 

 a triangular tooth ; second ventral segment with a median tooth ; head 

 subquadrate, hardly as wide as the thorax, rounded behind ; mandibles 



edentate. (Africa.) 



(Type M. guineensis Fabr. ) Dolichomutllla Ashm. g. n. 

 Pygidium with a pygidial area ; thorax scarcely twice as long as wide, un- 

 armed, the sides more or less contracted medially, almost violin-shaped ; 

 second ventral segment normal ; head large, quadrate, wider than the 

 thorax, the hind angles acute, cheeks beneath armed with a strong tooth ; 

 mandibles usually bidentate, rarely simple, the outer tooth much the longer. 



Hseudomethoca Ashm. 

 6. Head quadrate or subquadrate, the hind angles rounded, not acute ; pygidial area 

 distinct; mandibles not excised beneath, simple, edentate or with a slight 

 tooth within before apex. 

 Thorax elongate, nearly thrice as long as wide, very coarsely irregularly pitted 

 or foveolated, the anterior margin squarely truncate, the angles acute or 

 toothed; lateral hind angles of mesonotum produced ^^'-^jdly into a tri- 

 angular tooth; mandibles edentate; maxillary palpi 6-jointed, the first t.o 

 short ; labials 4-jointed, the third dilated, the last long, fusiform. (Australia ) 

 (Type M. rugicollis Wf.stw. ). BothriomutlUa Ashm. g. n. 

 Thorax hardly twice as long as wide, as seen from above more or less hexagonal, 

 unarmed. 



