THE CANADIAN ENTOMOLOGIST. 271 



7. Mandibles 2-dentate 8. 



Mandibles 3-dentate (5) Dissemphalus, Ashmead. 



(Type D. xanthopus, Ashm.) 



8. Maxillary palpi normal ; labial palpi 3- 



jointed (6) Ateleopterus, Forster. 



(Type A. Forsteri, Kirchner.) 

 Maxillary palpi deformed ; labial palpi 3- 



jointed (7) Apenesia, Westwood. 



(Type A. amazonica, Westw.) 



9. Antenna? 12-jointed; maxillary palpi 4- 



jointed (8) Cephalonomia, Westwood. 



(Type C. formiciformis, Westw.) 



10. Front wings with a stigmated marginal vein and a marginal cell, the 



radial vein always well developed 13. 



Front wings without a stigmated marginal vein and marginal cell, the 

 radial vein not at all or only slightly developed, sometimes wholly 

 absent 11. 



n. Front wings with a short linear marginal vein and a short radius. . 12. 

 Front wings without a marginal and a radial vein. 



One basal cell; antennae 13-jointed. . .(6) Ateleopterus, Forster. 

 No basal cell; antennae 12-jointed. .(8) Cephalonomia, Westwood. 



12. Two basal cells about of an equal length. 



Antenna? 13-jointed (9) Laelius, Ashmead. 



(Type L. trogodermatis, Ashm.) 



Antenna? 12-jointed (10) Bethylus, Latreille. 



(Type B. cenopterus, Latr.) 



13. Basal vein with a branch directed backwards, sometimes forming a 



small closed cell ; parastigma usually present 17. 



Basal vein without such a branch ; no parastigma. 



Front wings with an incomplete or open marginal cell 14. 



Front wings with a complete marginal cell ; antennae 13-jointed. 



With one discoidal cell (11) Sierola, Cameron. 



(Type S. testaceipes, Cam.) 



With two discoidal cells (12) Eupsenella, Westwood. 



(Type E. agilis, Westw.) 



14. Mesonotum without furrows, or the furrows are incomplete and 



indistinct 16. 



