64 Bulletin Wisco7isi7i 'Natural History Society. [Vol. 6, Nos. 1 — 2. 
3. Triang-le.s of wing-s with the axis parallel to the wing ; ante- 
cubitals of the first and second series not corresponding. . . . 
Aeschnidae 
Triangles of the fore wings with axis at right angles to the 
wing, of hind wings coinciding with wing Libellulidae 
The sub-families are arranged similarly. 
1. Eyes far apart 2 
Eyes approaching, or approximated 3 
2. Wings with numerous antecubitals (1) Calopteryginae 
Wings with two antecubitals (2) Agrioninae 
3. Antecubitals of the first and second series not corresponding. . 4 
Antecubitals of the first and second series mostly corresponding 7 
4. Stigma with a brace vein at inner end in space below 5 
Stigma without brace vein (3) Cordulegasterinae 
5. Subtriang-le of fore wing of one cell • 6 
Subtriangle of fore wing of three cells (4) Petalurinae 
6. Eyes separated by a wedge-shaped occiput (5) Gomphinse 
Eyes touching for some distance (6) Aeschninae 
7. Triangle of hind wing level with arculus, or before it 8 
Triangle of hind wing beyond the level of the arculus 
(7) Macromiinae 
8. Eyes tiibercled behind (8) Cordulinae 
Eyes not tuberculed (9) Libellulinas 
Fig. 1. WINGS OF TRAMEA CAROLINA (LIBELLULTN.F:) , SHOW- 
ING NOMENCLATURE. 
