42 THE CANADIAN ENTOMOLOGIST. 



constriction between the first and second segments, the first segment 

 trapezoidal, convex above, not longer than wide at apex. ^ ( $ 



unknown) Sierolomorpha, Ashmead. 



(Type Sierola ambigua, Ashm.) 



3. Second and third cubital cells each receiving a recurrent nervure.. . .4. 

 Second cubital receiving both recurrent nervures. 



Claws cleft ; marginal cell not separated from the costa at apex ; 

 first joint of flagellum a little shorter than the second. 



S • Cosila, Guerin. 



(Type C. Chilensis, Guer.) 



4. Claws cleft, or with a tooth or lobe at base beneath 5. 



Claws simple 6. 



5. Claws with a tooth beneath ; head large, quadrate or nearly, armed 



with a tooth on each side beneath Dicrogenium, Stadelman. 



(Type Pristocerus rosmarus, Stadelm.) 

 Claws usually cleft ; head transverse, unarmed. 



Claws not dilated into a rounded lobe at base ; hind tibiae serrate; 

 marginal cell at apex rounded, separated from the costa and 

 usually with an appendage ; cubitus in hind wings originating 



before the transverse median nervure. $ Cosila, Sichel. 



Claws dilated into a rounded lobe at base ; hind tibiae with the 

 superior margin tuberculate, crenate and pilose or spined 

 between the tubercles ; third cubital cell anteriorly not dilated. 



Marginal cell at apex entire Callosila, Saussure. 



(Type Myzine signata. Smith.) 

 Marginal cell at apex strongly truncate. . . Colobosila, Sichel. 



(Type C. fasciculata, Sich.) 



6. Head not large, quadrate, quite differently shaped 7. 



Head very large, quadrate; ocelli subtriangularly arranged ; mandibles 



short, stout, bidentate ; antennas short, inserted on the anterior part 

 of the face, the scape stout; marginal cell hardly as long as the first 

 cubital cell, rounded at apex, the submedian cell much longer than 



the median Maurillus, Smith. 



(Type M. australis. Smith.) 



7. Head subglobose, the ocelli close together in a triangle ; mandibles 



tridentate ; antennae inserted close to the anterior margin of the 

 head, filiform, tlie scape longer than joints 2 and 3 united ; marginal 

 cell long, subtruncate at apex ; median and submedian cells equal ; 



