456 ENTOMOLOGICAL NEWS. [Dec., 'oS 



the media, with accompanying supplement, and the ends of the 

 branches of the cubitus. It appeared evident that the best char- 

 acters were in the media and supplement, and attention was 

 concentrated on these. At the very outset it was noticed that 

 the medial supplement was very strong, only zigzagged at its 

 very end, and its apical half was strongly curved. Taking the 

 genera with a strong supplement, it was easy to construct a 

 table in 



Hind Wings. 



One row of cells between supplement and M 4 i. 



More than one row of cells between supplement and M 4 2. 



1. Seven double cells between M 3 and M 4 . . Planaescima, Oligoaesolma 



(Dolaeschna) ; also, but with two double cells (at apex) be- 

 tween supplement and M 4 , Telepblebia. 

 Three or four double cells between M 3 and M 4 . 



Ten cells on margin between CUi and M 4 Bracliytron. 



Fourteen cells on margin between Cuj and M 4 .... Nasiaesclma. 

 At most one double cell between M 3 and M 4 (head no doubt Lith- 



aesclma, but the region partly obliterated). 

 Two strong veins running from supplement to margin. 



Perithemis (Libellulid). 

 No strong veins running from supplement to margin. 



Gomphaeschna. 



2. Supplement bent so that a point near middle is nearer the margin 



than a point beyond Auax, Hemianax. 



Supplement not thus bent 3. 



3. Not more than two rows of cells between M 4 and supplement. 



Boyeria, Aeschnophlebia. 



More than two rows of cells between M 4 and supplement, at least in 

 part of their course 4. 



4. M 4 with a little bend or deflection not far from the end 5. 



This bend absent or barely suggested. 



Basiaeschna ; see also Aeschna juncea. 



5. Cells between M 3 and M 4 double from bend of M 4 on..Hoplonaescbna. 

 Cells between M 3 and M 4 double at bend, but mostly or all single 



beyond 6. 



6. Where supplement and M 4 are widest apart, six rows of cells between. 



Stauropblebia, Amphiaescbna. 



Where supplement and M 4 are widest apart, not over four rows of 

 cells between Gynacantha, Aeschna californica. 



In this scheme, the fossil ran straight to Basiaeschna, with 

 which it agreed well, except that the cells between Citj and 

 Cu were somewhat different, and especially in the arrange- 



