48 

 INDIAN DEAGONFLIES, 



BY 



Major F. C. Feaser, I.M.S. 



{With Text-figures.') 



{Continued from page 932 of Volume XXVI.) 

 Part VII. 



64. Rhyothemis plutonia, Selys. 



Male and female much alike. 



Male : Expanse 64 mm. Length 30 mm. Female : Expanse 54 mm. 

 Length 28 mm. 



Head : eyes reddish brown above, paler olivaceous beneath and at the 

 sides; vesicle, frons and upper part of epistome metallic blue green; occiput 

 blackish brown ; lower part of epistome, labium and labrum brown. 



Prothorax black. 



Thorax and abdomen brown with a metallic green lustre. Legs brown. 



Wings ; both short, the fore narrow, the hind very broad, especially at 

 the anal area ; black or blackish brown by transmitted light but reflecting 

 a dark, metallic green. In the male the] metallic lustre is general through- 

 out the wing but in the female is most marked at the base, especially in 

 the fore part of loop. The apex of forewing in the male is hyaline, 

 this area being very variable, from a mere spur at the extreme apex, to a 

 wider area extending to within 1 or 2 cells of the stigma and running 

 obliquely outwards and backwards. In the female both wing apices are 

 hyaline, in the fore to just proximal of the stigma and in the hmd to 1 

 cell distal of the stigma, its free border being here deeply concave. In the 

 male, there is often a clearer triangular area just distal of the node more 

 marked in the hindwing than in the fore. 



Sexual organs as for the genus. 



Hab. Burma, Bengal, Indo-Malay and Indo-China, Borneo. 



65. Rhyothemis triangularis, Kirby. 

 Rhyothemis lankana, Kirby. 

 Rhyothemis bipartita, Selys. 



Expanse 60 mm. Length 28 mm. Subject to slight variation in size. 



Head : eyes reddish brown above, lilaceous at the sides and beneath ; 

 vesicle and forehead metallic green ; face and labrum yellowish. 



Prothorax brown. 



Thorax and abdomen blackish with a metallic green lustre. Legs black. 



Wings short and broad, the anal field of hindwing very broad. In both 

 sexes hyaline, with the bases of all wings deep black, this part appearing 

 dark metallic blue Ly reflected light. The hyaline part is suffused with a 

 greyish brown'which gradually deepens as traced towards the wing apices. 

 The limits of the black basal marking in the forewing, up to the 2nd 

 antenodal nervure and to the distal or proximal end of trigone ; in the 

 hind up to the 3rd antenodal nervure or in some specimens up to as far as 

 the node. The outer border of the marking sharply defined and serrated 

 or notched. The extent of the marking is extremely variable, Ceylon 

 specimens usually being more extensively marked than those from South 

 India. In an average specimen, the black extends to within I cell of the 



