324 THE CANADIAN ENTOMOLOGIST. 



Thorax oblong, narrowed posteriorly, rounded in front, the 

 scutellum very minute; eyes small, oval. (North 



America.) Morsyma, Fox. 



(Type M, Ashmeadii, Fox.) 



5. Thorax not obbell-shaped 6. 



Thorax ob-bell-shaped, widest in front, the pronotum very short, 



wider than the mesonotum and a little wider than the head. 



Head transverse, the temples narrow; ocelli wanting ; scutellum 

 present ; abdomen spotted with white, the first segment 

 narrowed into a slight petiole at base, but broad at apex and 

 sessile with the second. (Asia, 



Africa ) Spilomutilla, Ashm., gen. nov. 



(Type Mutilla perfecta, Radoszk.) 



6. Thorax oblong, but compressed medially at the sides ; head large, 



quadrate, the temples usually very broad, not oblique ; ocelli 

 distinct ; scutellum indistinctly differentiated. 



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



(Type Mutilla dumbrodia, Pering.) 

 Thorax oblong, as wide behind as before, or nearly, and only slightly 

 compressed at the sides medially ; head .obtrapezoidal, the temples 

 oblique; ocelli subobsolete ; scutellum entirely absent. 



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



(Type Mutilla aeda, Pe'ring.) 



7. Head large, quadrate, usually much broader than the thorax, the 



thorax oblong quadrate, the sides parallel, or nearly, the front 

 angles acute ; mandibles 3-dentate. 



Head armed with a large tooth on each side beneath, the upper 

 hind angles acute ; scutellum present ; clypeus bidentate ; 

 eyes oval, placed anteriorly rather close to the mandibles. 



(North America.) Myrmilloides, Andre. 



(Type Mutilla grandiceps^ Blake.) 

 Head unarmed, the upper hind angles not acute ; scutellum 

 present ; clypeus not bidentate. (Europe, Africa, 



Asia.) Myrniilla, Wesmael. 



(Type Mutilla distincta, Lepel.) 



8. Front wings with only two cubital cells 9. 



Front wings with three cubital cells, or the third partially formed, 



never entirely absent ...,..., ,...,....,,,,..., H, 



