492 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. XXVI. 



except the 8th, 9th and 10th. A broad, conical, subdorsal spot with the base 

 at the proximal end of the segments, which gradually diminish in size as 

 traced back. A pair of spots on each segment on the ventral surface. 

 Anal appendages black. 



Wings hyaline. Amber tinted rays in the hindwing in the inferior costal space 

 as far as the 1st antenodal nervure and in the cubital space as far as the cubital 

 nervure, posteriorly to which it slopes rapidly towards the membrane ; subtri- 

 gone formed of 2 cells, the traversing nervure strongly curved ; 7 antenodal 

 nervures ; stigma and membrane as for the male. 



Hab. The borders of weedy tanks. Bombay, Calcutta, Malabar, Ceylon, 

 Lower Burma. 



29. Brachydiptax farlnosa, Ris. 



Bmchydiplax sobrina, Selys*. 

 Bmchydiplax pruhwsa, Laidlaw. 

 Male and female ; expanse 46 mm., length 28 mm. 



A rather smaller but very similar species to the last and distinguished from 

 it chiefly by the small size of the lamina and the greater number of antenodal 

 nervures. 



Head similar to sobrina, the vesicle and upper part of forehead blue metallic. 

 Prothorax and thorax of male green metallic, frosted with blue, densely in 

 front and on the tergum, thinly at the sides. No markings. 



The female a black metallic green with a variable number of small, yellow 

 spots on the sides. 



Abdomen narrow, depressed and tapering, in the male, frosted brightly with 

 blue in the first 6 or 7 segments and black in the remainder; in the female black, 

 no frosting, the 3rd, 4th and 5th segments with small, lateral, yellow spots 

 which are obsolete in adult specimens. A small yellow spot on the 6th and a 

 rather larger spot on the 7th segment. 



Wings hyaline, relatively long to the abdomen ; antenodal nervures 

 8 to 9 ; base of hindwing hyaline or a bright amber suffusion as far out as the 

 cubital nervure. Legs as for sobrina. 



Genital organs as shown. 



Hab. Burma, Bhamo. 



Genus — Acisoma. 



Fig. 32. — Wing neuration of Acisoma panorpoides panorpoides (x2|). 



