216 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



2. Scutellum completely separated from the mesoscutum 

 by a suture; proepimeron wanting; anterior tibiae 

 with one apical spur; sheath very long and exserted 

 beyond the tip of the abdomen; cubitus joining the 



basal vein much below the costa Sirecoidea 



Scutellum never completely separated from the mesoscu- 

 tum by a suture, the suture always wanting laterally; 

 proepimeron present; anterior tibiae with two apical 

 spurs; cubitus joining the costa or touching the basal 

 vein very close to the costa; mesoprescutum always 

 present Tenthredinoidea 



SUPERFAMILY MEGAL,ODONTOIDEA. 

 TABLE TO THE FAMILIES. 



First perapterum wanting; anterior tibiae with two calcaria 



Megalodontidse 

 First perapterum present, seen a short distance below the 



tegulae as a small free plate 1 



1. Anterior tibiae with one calcaria; basal joints of the flagel- 

 lum separate; intercostal vein wanting; radial cell 



with one cross-vein; slender, elongate species Cephidx 



Anterior tibiae with two calcaria; basal joints of the fla- 

 gellum consolidated into a long basal joint; intercostal 

 vein present; radial cell with two cross- veins; species 

 robust Xyelidse 



FAMILY MEGALODONTIM}. 

 TABLE TO THE SUBFAMILIES. 



Scutellar lobe rudimentary or wanting; transverse median and 

 basal veins interstitial or nearly so; intercostal vein 

 wanting Megalodontinse 



Scutellar lobe large; transverse median vein received near the 

 middle of the first discoidal cell; intercostal vein 

 present Pamphiliinse 



FAMILY XYELJD^. 



This family contains five genera which are so closely related that 

 smaller divisions cannot well be made. 



FAMILY CEPHID^. 



This group has long been recognized as a family. Konow indicates 

 two tribes in his Cephini, but these divisions are hardly of subfamily 

 value; and until these insects have been more carefully studied I pre- 

 fer not to make any division into subfamilies. At some time it may 



