INDIAN DRAGONFLIES. 



675 



f Genus Phyllomacromia. 8th abdominal seg- 



j ment of female dilated at the sides : arc 



between the 2nd and 3vd antenodal nervu- 



res : only 1 species within Indian limits . . 



11 



10.; 



Genus Idionyx. 8th abdominal segment of 

 I female not dilated at the sides : arc be- 

 (^ tween the 1st and 2nd antenodal nervures. . 



( Vesicle not markedly prominent 

 ( Vesicle conspicuously prominent 



fPyramidal elevation on dorsum of 10th seg- 

 I ment with its point turned back in the direc- 

 I tion of base of abdomen 

 12-^ Pyramidal elevation on dorsum of 10th abdo- 

 I minal segment with its point inclining to- 

 1^ wards the end of abdomen . . 



f Vesicle prominent, conical, eminence. 

 I Antehumeral^ oval spots well defined 

 13^ Vesicle prominent, acute, spine-shaped like 

 I the horn of a rhinoceros. Antehumeral 

 ^_ spots very obscure 



Group 1. 



Genus — Hkmicokdulia, Selvs. 



Phyllomacromia nil- 

 giriensis, Fraser. 



11 

 12 



13 



Idionyx yolanda, Selys. 



Idionyx optata, Selys, 

 Idionyx ornata, Fraser. 



Idionyx corona, Fraser. 



Fig. 1. — -Wings of Hemicordidia asiatica, Selys. (x 2.5). 



Head moderately large and globular : eyes moderately contiguous : vesicle 

 high and slightly notched : forehead with a marked foreborder : suture shalloM , 



Prothorax with a small posterior lobe. 



Thorax moderately robxist, somewhat cubical and almost naked. 



Legs robust and long. 



Abdomen clavateinthe male, cylindrical and slightly dilated at the anal end 

 in the female. Auricles absent in both sexes. 



Anal appendages : the superior in the male long and sinuous when seen from 

 above, strongly arched seen from the side in profile, the inferior fused as in the 

 Libellulince, triangular, curving strongly upward to meet the superior. In the 

 female, the superior smaller and straighter and smaller than in the male, conical 

 and pointed. 



