INDIAN DRAGONFLIES, 109 
Dr. Tillyard merges the genus Hemianax with Anax but I prefer to keep 
them separate, as in addition to the absence of the supplementary ridges to 
abdomen, there are other generic characters. 
SEN 
4 { Sit) ee: me ey ry Ley OF 
2 ST Hie Ss 
/ 2 AERO Te E 
<< eae 
STITT 
5 
Le 
Y 
Fig. 2.—Wings of Anax parihenope parthenope, male. 
1. Arcular or basal space, 2. 5th nervure (Rs), 3. 5a nervure (Rspl), 
4. 4th nervure (M2 or nodal sector). 
Key to the Sub-family—AiscHnIN»&. 
Anal border of hindwing rounded in both sexes; 5th nervure (Rs) 
not bifurcated ; 4th nervure (M2 or nodal sector) with an abrupt 
convexity forwards at outer end of stigma; sectors of arc arising 
from above the middle of arc 
1 Anal border of the hindwing rounded in the female only ; 5th ner- 
vure bifurcated (except in Jagoria); 4th nervure uniformly curved 
as far as termen ; sectors of arc arising from or below the middle of 
are ne ae 7 
Genus Hemianax :— 
Only a single, lateral bordering ridge to 
2<~ segments 4 to 8, no supplementary ridge 
above it .. 
ae ae zs Me fe Hemianax ephippiger. 
Genus Anax :— 
{ Lateral, supplementary, parallel ridges to segments 4 to 6 3 
The thorax laterally, sky-blue marked 
with an anterior, narrow and a median, broad, 
2< black stripe ae 
| The thorax laterally gr 
ee oe ot Anax immaculifrons. 
een or pale brown, unmarked 
vie ie Oe 4 
Inferior anal appendages half the length of the 
superior . Ar its a se ae Anax guttatus. 
4 Inferior anal appendages considerable less than half the length of the 
superior ae te we ‘ se ae ste ata 
