INDIAN DRAGON FLIES. 



743 



Thorax very robust. Legs long and robust, the armature similar in both 

 sexes ; the hind femora with a row of robust, closely-set, gradually length- 

 ening spines, which in the other femora are replaced by a row of fine 

 spines, 



Tibise with a few widely-set, very stout spines ; claws very long and 

 entirely without claw-hooks or if present, only as the merest, tiny pro- 

 jection. 



Abdomen robust, the base a little dilated, slightly depressed, but the 

 end segments strongly keeled, tapering from the base to the anal end. No 

 ridge on the 4th segment. 



Wings long and broad, the reticulation close ; trigone in the forewing in 

 line with that in hind ; sectors of the arc with a long fusion ; the arc 

 between the 1st and 2nd anteuodal nervures ; 1.5i to 17^ antenodal nervures, 

 the final incomplete ; 8th nervure at the anal angle of the trigone ; trigone 

 in the hindwing generally a little proximal to the arc ; 1 cubital nervure to 

 all wings ; no supplementary nervures to the bridge ; trigone in the fore- 

 wing traversed, its costal side short, its relation to the hypertrigone about a 

 right angle ; trigone in the hindwing and all hypertrigones free ; subtri- 

 gone in the forewing 3 or 4 cells ; 4th nervure strongly undulated ; 2 rows 

 of cells between 5 and 5a. ; 8th nervure in the hindvving moderately con- 

 vex ; the discoidal field strongly dilated at the termen, with 3 cell rows ; 

 anal field broad, the loop very long, extending as far as 3 cells distal to 

 the outer angle of the trigone, its toe very narrow, 4 rows of cells between 

 it and the anal border of the wing, these cells not distinctly arranged in 

 rows. Membrane moderately large. Stigma medium. 



Sexual organs. 



See under species. 



Fig. 47. — Wings of Onychothemis tonkinensis ceylanica showing neu- 

 ration. 



56. Onychothemis tonkinensis ceylanica, Ris. 



Ris describes this insect as a new sub-species from Ceylon ; my own 

 description is made from a female specimen taken in the Nilgiris and, 

 allowing that Ris made his from a dried and faded specimen, the two agree 

 in the main and are doubtless the same species. I am not aware that this 

 insect has been taken in India before, 



Male and female very similar. 



