OF WASHINGTON, VOLUME XIII, 1911. 217 



be advisable to unite the Cephidae and Xyelidse into one family, treat- 

 "ing the groups here indicated as families as subfamilies. 



SUPERFAMILY ORYSSOIDEA. 

 FAMILY ORYSSID^. 



This family, which has the first perapterum wanting, has been 

 recognized for a number of years. It has been divided into five genera, 

 which, judging from the descriptions and a small amount of exotic 

 material, are so closely related as to make a division into subfamilies 

 unadvisable. 



SUPERFAMILY SIRECOIDEA. 

 TABLE TO THE FAMILIES. 



Notauli present; mesoscutum without oblique sutures from the 

 tegulae to the anterior margin of thescutellum; prono- 

 tum very short medially and not angulate laterally; 

 apex of the abdomen normal; anterior wings with an 

 intercostal vein Xiphydriidse 



Notauli wanting; mesoscutum with oblique sutures from the 

 tegulae to the anterior margin of the scutellum; prono- 

 tum large, perpendicular anteriorly and angulate lat- 

 erally; apex of the abdomen with a triangular-shaped 

 plate; anterior wings without an intercostal vein... Sirecidse 



FAMILY XIPHYDRIID^. 



In the presence of notauli, the indication of the first perapterum, 

 and the venation this family is more generalized than the Sirecidaa. 



TABLE TO THE SUBFAMILIES. 



Pronotum without a distinct dorsal surface laterally, and when 

 seen from above deeply emarginate anteriorly; radial 

 cell with across vein Xiphydriinse 



Pronotum with a distinct dorsal surface laterally, and when seen 

 from above not deeply emarginate anteriorly; radial 

 cell without a cross-vein Derecystin^e 



FAMILY SIRECID^. 

 TABLE TO THE SUBFAMILIES. 



Antennae long and slender, basal vein received near the middle 

 of the first discoidal cell; second transverse cubitus 

 present Si red n:> 



Antennae short and stout; basal vein and transverse median in- 

 terstitial, or nearly so; second transverse cubitus 

 wanting Tremecinn 



