40 THE CANADIAN ENTOMOLOGIST. 



Cubitus in hind wings originating before the transverse median 

 nervure 5. 



3. Hind femora not produced at apex beneath 4. 



Hind femora produced at apex beneath. 



Hind tibiae very strongly serrate on the outer 



face Engycistus, Fox. 



(Type Myzine rufiventris, Cress.) 



4. Hind tibiae denticulate or tuberculate on outer face ; the front tibiae 



produced into a long, acute spine at the 



middle Epomidiopteron, De Roraand. 



(Type E. Julii, De Romand.) 

 Hind tibiiB 7iot serrate on the outer face, the front tibite normal, 



unarmed Pterombrus, Smith. 



(Ty]3e P. aenigma, Smith.) 



5. Front wings with two cubital cells 6. 



Front wings with three cubital cells. 



Cubitus more or less obliterated at its origin ; second and third 

 cubital cells each receiving a recurrent nervure, the first 

 recurrent nervure strongly curved or angularly broken by 

 a stump of a vein and received by the second cubital cell at 

 its basal third ; tegulffi abnormally large ; mandibles bidentate ; 



claws cleft Paratiphia, Sichel. 



(Type P. albilabris, Sichel ) 



6. First transverse cubitus entire, not angularly broken by a stump of a 



vein; middle tibiae with only oie apical spur Tiphia, Fabricius. 



(Type T. femorata, Fabr.) 



7. First transverse cubitus entire, not obliterated at base, the first and 



second cubital cells distinctly separated 8. 



First transverse cubitus obliterated at base, the first and second cubital 

 cells more or less confluent 9. 



8. Cubitus in hind wings interstitial with the transverse median nervure 



or originating just before it; hind tibise serrate, the tarsi very 



long Engycistus, Fox. 



Cubitus in hind wings originating a little before the transverse median 

 nervure. 



Hind tihia2 denticulate or tuberculate on outer 



face Pterombrus, Smith. 



Hind tibiae not serrate on outer face, the tarsi 



normal Epomidiopteron, De Romand. 



