S THE CANADIAN ENTOMOLOGIST. 



13. Head subglobose ; flagellum filiform, the first joint obconical, longer 



than the second, the following joints longer than thick ; mandibles 

 with a tooth within before apex Stenorautilla, Andrd. 



14. Thorax longer, obpyriform or obovate 15. 



Thorax short, obovoid, above bare or nearly ; metathoracic 



spiracles (?) oval ; mandibles bidentate ; abdomen red and black, 



with the first segment petioliform, of an equal width 



throughout Allomutilla, Ashmead. 



15. Thorax bare; head subquadrangular ; eyes very small, placed 



towards the middle of the sides of the head ; antennae very short, 

 strongly clavate, the joints of the flagellum wider than 



long Rhopalomutilla, Andre. 



Thorax usually densely pubescent, the metathoracic spiracles long 

 oval ; mandibles tridentate at apex, or with one or two teeth within 

 before the apex ; antenn?e neither very short nor strongly clavate, 

 the first joint of the flagellum longer than the second ; abdomen 

 usually spotted with silvery-white or golden pubescent spots, the 

 petiole short, widest behind Dasylabris, Radoszkowski. 



16. Head with the hind angles acute or dentate, armed beneath wkh/otrr 



teeth, i.e., two small teeth at base of gula and a large tooth on each 

 side behind these ; mandibles bidentate, the lower tooth much 

 the longer Hoplorautilla, Ashmead, 



Tribe II. — Sphaerophthalmini. 



The members of this tribe exhibit the strongest aftinity with those in 

 the tribe Photopsidini, and many females are easily confused with some 

 in the latter. 



The closest attention, therefore, must be given to the difference in 

 the shape of the first abdominal segment, made use of in separating the 

 tribes, before they can be recognized. . 



Table of Genera. 



Males I. 



Females 7. 



I. Fully winged 2. 



Subapterous or with rudimentary wings. 



Thorax ovoid, coarsely sculptured, or rugosely punctured, with a 

 black pubescence ; head rather large, quadrate, wider than the 

 thorax ; eyes small, rounded ; mandibles 3-dentate ; first joint of 

 the flagellum not short, but hardly longer than the second. 



(North America.) Pycnomutilla, Ashm., gen. nov. 



(Type Mutilla vvaco, Blake.) 



