500 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. XXVl. 



Genus — Diplacobes. 



B 



B' 



■ Fig. 35. — A. Forewing of Diplacodes nebulosa. 



B. Forewing of Diplacodes trivialis contrasting its neuration 



with that of " A ". 

 B. Hindwing of Diplacodes trivialis. 



Diplacodes, Brauer 1868, Selys 1883, Karsch 1889, Kirby and Ris. 



Trithemis, Kirby. 



Diplax, Brauer. 



Libellula, Fabricius, 1793, Rambur 1842. 



Head very small ; eyes just meeting ; forehead moderately prominent, 

 rounded and mthout a marked foreborder ; suture moderately deep ; vesicle 

 rounded. 



Prothorax : posterior lobe moderate to very large, projecting in the middle, 

 slightly or thickly fringed with long hairs according to the species. 



Thorax comparatively narrow. 



Legs moderately robust ; middle and hind femora with a row of not very 

 closely set but usually long spmes, (Ai'mature of legs in the two sexes scarcely 

 difEermg), tibial spmes fine, numerous ; claw-hooks robust, situated about 

 the middle of the claws, slopuig. 



Wings relatively short and broad, reticulation moderately close. Trigone 

 in forewing slightly distal to that of the hind ; sectors of arc in forewing, 

 shortly fused, a long fusion in the hind ; are betAveen the 1st and 2nd antenodal 

 nervures ; 8th nervure m the forewmg strongly arched, in the hindwing sepa- 

 rated (usually widely so) from the anal angle of the trigone ; antenodal nervures 

 usually 7J, but variable, the final incomplete ; trigone in the hindwing at the 

 arc ; only 1 cubital nervure to all wings ; no supplementary nervures to the 

 bridge ; trigone m the forewing free or traversed, in the hind entire ; 4th 

 nervure flatly arched ; 1 row of cells between 5 and 5a ; discoidal field with 



