THE CA.NAD1A.N ENTOMOLOGIST. 325 



9. Not entirely black, the thorax red ; head transverse, rounded behind, 



the hind angles not acute 10. 



Entirely black. 



Head transverse-quadrate, the hind angles acute ; mandibles 



bidentate Pseudomethoca, Ash mead. 



(Type Mutilla Canadensis, Blake.) 

 Head transverse, rounded behind, the hind angles not 



acute Dimorphomutilla, Ashm., gen. nov. 



(Type Mutilla lunulata, Spinola.) 

 10. Head transverse, wider than the thorax ; mandibles not long ; 



bidentate at apex. (Europe, Africa.) Myrmilla, Wesmael. 



Head transverse-quadrate, wider than the thorax ; mandibles long, 

 narrow, arcuate, tridentate at apex. (Africa.) . . Labidomilla, Andre'. 



(Type Mutilla tauriceps. Kohl.) 



ir. Mesonotum with furrows ; hind tibife spinous on outer face 12. 



Mesonotum without furrows ; hind tibife not spinous on outer face. 

 Not entirely black, the thorax red ; front wings with two recurrent 

 nervures ; antennal joints 3 and 4 more than twice longer than 



thick. (Europe.) Myrmilla, Wesmael. 



Entirely black ; front wings with only one recurrent nervure ; 

 antennal joints 3 and 4 hardly longer than 

 thick (?) Dimorphomutilla, Ashm. (partim.) 



12. Mandibles 3-dentate. 



First and second joint of the flagellum not short, fully twice as long 



as thick. (South America.). Euspinolia, Ashm., g. nov. 



(Type Mutilla chilensis, Spinola.) 

 First and second joints of the flagellum short, the first distinctly 



shorter than the second. (Africa.) Dasylabroides, Andre. 



(Type Mutilla capensis, Sauss.) 



13. Antennae simple, never flabellate 14. 



Antennae abnormal, flabellate. 



Thorax with distinct parapsidal furrows ; the scutellum with a deep 

 furrov/ across the base ; front wings with three cubital cells. 



(Africa.) Psammotherma, Latreille. 



(Type Mutilla flabellata, Fabr.) 



14. Front wings with three cubital cells, or the third at least partially 



formed 15. 



