THE CANADIAN ENTOMOLOGIST. 145 



6. Body rather short, oviform, the abdomen not long ; scape small, 



scarcely longer than thick, not or only a little larger than the 

 pedicel (except in the Blasticotomin^e, which has, however, only 

 4-jointed antennae); antennre 4- to 15-jointed; head, seen from 

 above, not quadrate, the occiput more deeply concave, the temples 

 not so broad, more rounded behind, while there is no distinct 

 furrow or depression between the antennse and eyes, or so slight as 

 to be scarcely noticeable Family XL, Selandriidse. 



Body elongate, the abdomen usually long, narrow and subcylindrical ; 

 scape rather large, usually thrice as long as thick or about four 

 times larger than the pedicel ; antennae 9-jointed ; head, seen from 

 above, quadrate, the temples very broad and with a furrow, channel 

 or depression on each side of the antennae, between them and 

 the eyes, which extends upwards and posteriorly on the 



vertex Family XIV., Tenthredinidfe (pars) 



( = Subfamily Strongylogasterinae). 



7. Front wings with two marginal cells 8. 



Front wings with one marginal cell ; second submarginal cell 

 receiving two recurrent nervures ; lanceolate cell contracted near 

 the middle and closed at base, or petiolate ; antennae 

 9-jointed Family XII., Nematidae. 



8. Abdomen acutely margined at sides ; antennae clavate,5- to 8-jointed . . 9. 



Abdomen not margined at sides ; antennae not clavate, 8- to 9-jointed; 

 front wings with three or four marginal cells. 



Front wings with four submarginal cells, the second usually 

 receiving both recurrent nervures, or the second recurrent is 

 interstitial with the second transverse cubitus, very rarely 

 joining the base of the third submarginal cell ; abdomen 

 short, oviform Family XIII. , Dineuridas. 



Front wings with four submarginal cells, the second and third 

 each receiving a recurrent nervure ; if with three submarginal 

 cells, either the first or the second transverse cubitus is wanting ; 

 abdomen elongate, subcylindrical. . Family XIV.,Tenthredinidae. 



9. Dorsal plates of first abdominal segment usually deeply emarginate 



medially, leaving a membrane exposed.. . .Family XV., Cimbicidie. 



