316 
10 
12 
13 
DRAGONFLIES OF NORTH AMERICA 
Superior abdominal appendages large, greatest length as long or 
longer than 10th segment (except sulcatum). Dorsum of abdo- 
minal segment 2 with the black of the dorsum extending from 
the base to the apex of the segment. Color predominantly black 
with orange or yellow markings, occasionally blue........ 13. 
Abdominal segments 8-9 unmarked with black............... 4, 
Abdominal segment 8 marked with black, 9 blue entirely.....11. 
Abdominal segment 2 with dorsum entirely black. boo p. 322 
Abdominal segment 2 blue with a black spot................ 5. 
Inferior appendages longer than the superiors................ 6. 
Inferior appendages as long as the superiorsorshorter......... 9. 
M; arising between the 3rd -4th postnodal cross veins in the hind 
WURIP OR ft 62 te <6 22 =e 10S spa te eR en hageni, p. 322 
M;, arising between the 4th—5th postnodals in the hind wing... .7. 
Superior appendages blunt, berry-like........... boreale, p. 323 
Superior appendages with tips more or less acute.............8. 
Superior appendages with tip recurved. Humeral dark stripe 
broken and ‘very nalrow.. 2.2.20. ees ee clausum, p. 324 
Superior appendages with tip directed posteriorly. Humeral stripe 
wider and mot broken? }...).0/) 0... 8 cyathigerum, p. 324 
Abdominal segments 3-5 at least one-third blue............. 10. 
Abdominal segments 3-5 mostly black....... piscinarium, p. 325 
With 4-5 antenodal cells between M4 and Cul...durum, p. 325 
With 3 such antenodal cells................ minusculum p. 325 
Abdominal segment 9 marked with black on the sides.......... 
geminatum, p. 326 
Superior abdominal appendages with the tips recurved........ 
ocd tty lathn Sere thaw ai ah hs OLR EO EE recurvatum, p. 326 
Superior abdominal appendages with the end truncate, distal mar- 
gin slightly convex, inferiors longer than superiors............ 
laterale, p. 327 
Abdominal segment 2 with the dorsum entirely black........14. 
Abdominal segment 2 with the black of the dorsum assuming a 
U-shape, the arms of the U reaching from near the base to the 
apex so as to isolate a pale median spot from the pale of the 
BIGES . 6.05 es oc eae o.sie, yes See ee cultellatum, p. 327 
