THE CANADIAN ENTOMOLOGIST. 211 



Second and third submarginal cells each receiving a recurrent 

 nerviire. 



Head seen from in front usually much broader than 

 long ; 9 antenuiii slender filiform, (J furcate. 



Hind wings without an anal c^W. Sericocera, Brulle. 



Hind wings with an anal cell. . .Schizocera, Latreille. 



Head seen from in front not or scarcely broader than 



long ; second sul)niarginal cell aloi^.g the radius not 



longer than the third ; hind wings with two discal cells ; 



9 antennas subclavate, J furcate. .. Cy///(?//rj!, Dahlbom. 



3. Second submarginal cell much longer than the third, the latter 



quadrate; $ antennto filiform, ^ furcate Sciiizocera, Latreille. 



4. Second submarginal cell receiving the first recurrent, the second 



recurrent interstitial with the second transverse cubitus ; middle and 

 hind tibi?e with a lateral spur Scorbina^ Lepel. 



4. Second submarginal cell receiving both recurrent neivures ; middle 



and hind tibia; without lateral spurs ; hind wings with two discal 

 cells ; mandibles simple Fseudocyp/iona, Ashm.,* n. g. 



5. First submarginal cell receiving both recurrent nervures. T/ie/nos,^or\.or\. 

 First and second submarginal cells each receiving a recurrent 



nervure Schizocera, Latr. 



= Atomocera, Say. 

 = Sphecophihis, Pro v. 



6. Front wings with four submarginal cells ; if with three, which occurs 



only in a single genus in the $ , the second transverse nervure 

 wanting _ 9. 



Front wings with three submarginal cells, the first transverse cubitus 

 wanting. 



First and second submarginal cell each receiving a recurrent 



nervure y. 



First submarginal cell receiving both recurrent nervures ; hind 

 wings with two discal cells, the first (in reality the first sub- 

 marginal) about twice as long as the second. . Dielocerus, Curtis. 

 Second submarginal cell receiving both recurrent 



nervures Topotrita, Kirby. 



7. Middle and hind tibise with a lateral spur 8. 



*Type P. Mexicana, 



