10 
Et 
12 
13 
COENAGRIONINAE 281 
Spines of the tibiae long, generally twice as long as the intervening 
ULL). 2 haces ally a a cM eR ea AE a Aas AF 3. 
Spines of the tibiae short, hardly longer than the intervening 
PRC ER PNO AS o Ssiwaiees Sc Sates hae do Panto YRS D dele 5. 
Two rows of cells between vein Cu, and the hind margin. . 
ee. tee Oe CONN Re Miner tree fe Sclton 5 eos Hepaneue p LB 284 
One cell row between vein Cu, and the hind margin.......... 4. 
mvem Cu. tour or ive cells long. . 22.6222... Argiallagma, p. 302 
Vem ‘Cu; ten or more cellsjlong = ................- Argia, p. 286 
No pale’ post, ocular. spots; om head ss! ac. By aeyeed teu Hse! ee so 8 6. 
With. pale post ocular spots on head... .. 6 ...j.850.5ad.. 10. 
Body (mature) black and red, at least in the males; rather short 
RURAL OD Gi fos, Bese eh apc ine ak eens MPA, ST ERs SB cp 
Body not black and red; more slender...................... 9. 
Hind wing with the costal side of the stigma shorter than the 
MATA AC es A ac 8 Boe Ae Auer Uae Hesperagrion, p. 303 
Hind wing with the costal side of the stigma not shorter than the 
CeCe ha shite ete eee) ah al, So cea) a pratey acai Soak OA 8. 
No ventral spines on abdominal segment 8 of female; male su- 
perior appendages bifid................. Amphiagrion, p. 304 
With a ventral spine on abdominal segment 8 of female; male 
superior appendages entire.:.............-- Telebasis, p. 305 
Body metallic green above; very slender; length about an inch 
sheds Gi koaveler sl as eeteRe Sl eee, GD ERS Nehalennia, p. 306 
Body blue and black above; larger and more robust............ 
wath as denna a at's LS RRR REE Eee Chromagrion, p. 309 
Stigma in fore and hind wing of male similar............... a 
Stigma in fore and hind wing of male dissimilar............. 15. 
One or both wings generally stalked to the anal crossing; abdomen 
WEEV sO, (G2 50 MIN) ooh. 5 22 ch er ae Teleallagma, p. 309 
Wings not stalked as far out as the anal crossing............ 12. 
Costal side of stigma shorter than the radial side.............. 
iss as Syd oA ois BR fo ag MECN Ee Hesperagrion, p. 303 
Costal side of stigma not shorter than the radial side........ 13. 
No ventral spine on abdominal segment 8 of female............ 
= eR OS ee bese PPE Br dee Ls Coenagrion, p. 310 
With ventral spine on abdominal segment 8 of female........ 14, 
