456 ENTOMOLOGICAL NEWS. [Dec., ’o8 
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 
Hiind Wings. 
One row of cells between supplement andM,...........-. I. 
More than one row of cells between supplement and M,....... 2. 
1. Seven double cells between M, and M,. . Planaeschna, Oligoaeschna 
(Dolaeschna) ; also, but with two double cells (at apex) be- 
tween supplement and M,, Telephlebia. 
Three or four double cells between M, and My. 
Ten cells on margin between Cu, andM,....... Brachytron. 
Fourteen cells on margin between Cu, and M,. . . . Nasiaeschna. 
At most one double cell between M, and M, (head no doubt Lith- 
aeschna, 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 begormd, 46%. as see aes Anax, Hemianax. 
Supplement not.thus bent... aise wis). Gh were 3. 
3. Not more than two rows of cells between M, and supplement. 
Boyeria, Aeschnophlebia. 
More than two rows of cells between M, and supplement, at least in 
part of their COMMPSE: 6h. eile one 9 cleo eee 4. 
4. M, with a little bend or deflection not farfrom theend ...... 5 
This bend absent or barely suggested. 
Basiaeschna; see also Aeschna juncea. 
5. Cells between M, and M, double from bend of M, on..Hoplonaeschna. 
Cells between M, and M, double at bend, but mostly or all single 
beyond 2. a seks 6 ee He oul lets te ae 6. 
6. Where supplement and M, are widest apart, six rows of cells between. 
Stauropblebia, Amphiaeschna. 
Where supplement and My, 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 Cu, and 
Cu, were somewhat different, and especially in the arrange- 
