THE CANADIAN ENTOMOLOGIST. 147 



Abdomen abnormal, with from 3 to 5 visible segments, the 

 terminal segments most frequently retractile, telescopic-like, 

 the venter concave or flat ; species metallic ; antennae most 

 frequently filiform, inserted close to the anterior border of the 

 head, 13-jointed, scutellum convex, conical or spined, rarely 

 flat Family XXXI., Chrysididse. 



Metathoracic angles rarely toothed or acutely produced, the metanotum 

 posteriorly squarely truncate or rounded, not concave ; scutellum 

 normal or in some wingless females entirely absent ; antennae 

 filiform or subclavate, rarely flabellate in some males ; abdomen 

 always with more than 5 dorsal segments. 



Hind wings with a distinct venation, and always without anal 



lobes ; females never apterous 4. 



Hind wings without a distinct venation, and always with an anal 

 lobe ; females often apterous ; middle tibise with two apical 

 spurs ; antennae 10- to 26-jointed. ..Family XXXH., Bethylida?. 



4. Trochanters 2-jointed ; middle tibisB with two apical spurs ; eyes 



normal, not emarginate within : antenna lorigi filiform, 15-jointed 



or more, similar in both sexes Family XXXHI., Trigonalidse. 



Trochanters i-jointed ; middle tibiae with one apical spur ; eyes reni- 

 form or emarginate within; antennae in $ 12-jointed, in $ 13- 

 jointed Family XXXIV., Sapygidse. 



5. Middle coxk contiguous or nearly 7. 



Middle coxae distant, usually widely separated 6. 



6. Stigma in the front wings not well developed, at the most only slightly 



developed, either very small or linear; eyes most frequently emar- 

 gmate withm ; middle tibife with two apical spurs. 



Pygidium in $, deeply emarginate at apex, the hypopygium 

 terminating in a sharp thorn or aculeus, which curves upwards 

 and rests in the emargination of the pygidium ; claws 



cleft Family XXXV., Myzinidje. 



Pygidium in c^ entire, or at most with only a slight sinus, the 

 hypopygium terminating in three spines ; claws 



simple Family XXXVI., Scoliidae. 



Stigma in front wings well developed, ovate or subovate ; eyes entire, 

 never emarginate within ; pygidium in ^ entire, the hypopygium 

 terminating in a sharp aculeus which curves 

 upwards Family XXXVII., Tiphiidas, 



