INDIAN DRAGON FLIES. 735 



rows, strongly dilated at the termen ; anal field of hindwing broad ; loop 

 with a broad apex, traversed cells at the outer angle. Membrane and 

 stigma of medium size. 



Sexual organs. For male, see under species. 



Female with a small, projecting vulvar scale ; border of 8th segment 

 not dilated. 



Key to Species. 



1. 8^ antenodal nervurea to the forewing ; apices 



of wings hyaline 7. ccesia. 



2, 12i antenodal nervures to the forewing ; all 



apices tipped broadly with dark brown ; 

 hindwing with a large, dark brown, basal 

 spot 7. limhata. 



51. Indothemis csesia, Ftis, 1911. 



LibelhUa ccesia, Rambur, 1842. 

 Trithemis casia, Brauer. 

 Diplax mcridionalis, Selys. 



Male: Expanse 65 mm. Length 40 mm. Abdomen 17 mm. Hind- 

 wing 32 mm. 



Head globular ; eyes broadly contiguous for a distance equal to the 

 breadth of the occiput, dark reddish brown with a purple sheen 

 above and a dark lilac grey at the sides and beneath ; occiput black ; 

 vesicle metallic blue , frons metallic blue ; epistome black with yellow 

 sides ; labrum black ; labium brownish. 



Prothorax lobe small, recumbent, rounded and fringed with a few long 

 cilise, black. 



Thorax long and narrow, bluish black above and at the sides, marked 

 obscurely with black as follows : — the mid-dorsum broadly, a humeral 

 stripe with irregular borders and the lateral sutures. The bluish black 

 changes to a greenish yellow on the metepimeron, the latter colour extend- 

 ing on to the under surface. 



Wings hyaline ; antenodals 8^ to 9^ ; discoidal field very variable, 

 even in the wings of individual species, commencing with a row of 3 cells', 

 then 2 or more rows of 2 cells, or commencing with 2 rows of 3 cells and 

 then 2 rows of 2 cells. Stigma dark brown. 



Legs black, the bases of femora a pale yellow. The hind femora with 

 scanty, widely set, short spines and one longer one at the distal end ; mid 

 femora with a row of gradually lengthening spines. Tibial spines long and 

 numerous. 



Abdomen laterally parallel, dorso-ventrally dilated at the base, depres- 

 sed in the middle part and then at the anal end again slightly dorso- 

 ventrally dilated. Bluish black marked with large, wedge-shaped, lemon 

 yellow spots on all segments except 9 and 10. These spots have their base 

 at the proximal end of the segments and gradually decrease in size as 

 traced towards the anal end of abdomen. Beneath, a similar set of spots, 

 except on the 9th and 10 segments. 



Anal appendages creamy white with black tips. 



Sexual organs : lamina procumbent, almost invisible in profile ; 

 tentaculfe with a foliate, external branch, internal branch hooked ; lobe 

 small, rounded. 



