32 



THE ENTOMOLOGIST. 



I First joint of the flagellum almost as long as 



all the following joints together. - - Diphora. 



II First joint of the flagellum much shorter than 



all the following joints together. 

 § Middle keel of the metathorax forked. - - Belyta. 



§§ Middle keel of the metathorax not forked. 

 X Third dorsal abdominal segment much longer 



than the fourth. 

 Marginal branch as long as the radial areolet. 

 Last joints of the flagellum more than twice 

 as long as broad. . . . . Cinetus. 



00 Marginal branch much shorter than the radial 

 areolet. Last joints of the flagellum not more 

 than twice as long as broad. - . - Xenotoma. 



X X Third dorsal abdominal segment not longer or 

 not much longer than the fourth. 

 Dorsum of the abdomen with eight segments, 

 -i- Radial areolet closed. 

 X Joints of the flagellum only slightly shortened 



near the tip. .... Zelotypa. 



■>-*i-<- Joints of the flagellum much shortened near the 



tip. ------ Pantoclis. 



-1--1- Radial areolet open. 



■i-H- Stigmatic brancli and submarginal branch much 

 shortened, the former emerging from a nearly 

 right angle. ----- Zygota. 



•1-+H-+ Stigmatic branch and submarginal branch not 

 unusually shortened, the former emerging 

 from a very crooked angle. - - - Aclista. 



00 Dorsum of the abdomen with less than eight 



segments. 

 -H Dorsum of the abdomen with seven segments. - Acropib:sta. 

 -+•-(- Dorsum of the abdomen with less than seven 

 segments. 

 --+ Marginal branch more than twice as long as the 

 radial areolet ; recurrent continuation of radial 



branch intersecting the basal vein. 



-Maceohynnis. 



Marginal branch shorter, as long as, or a little 

 longer than, the radial areolet ; recurrent con- 

 tinuation of radial vein not intersecting the 

 basal vein. 



Dorsum of the abdomen with three segments ; 

 second unusually elongated, almost extending 

 to the tip. Marginal branch distinctly shorter 

 than the radial areolet. 



Miota. 



