INDIAN DRAGONFLIES. 157 



W. Male dull red or orange coloured. 



Wings relatively short. Basal spot in 



the hind smaller. 

 A tuft of stout bristles on the lamina . . O. chnjsis. 

 ii\ Adult male with a bluish-black or violet 

 metallic forehead. 

 Abdomen crimson, thinly overlaid with 

 blue frosting which gives it a violet 

 appearance O. pruinosum. 



15. Orthetrum cancellatum cancellatum, Dur. 



Lihellula cancellata, Linne. 

 Libella cancellata. Brauer. 

 Lihellula frumenti, Muller. 

 Hydianympha helvetica, Buchecker. 

 Expanse 68 mm. Length 40 mm. 

 Head ; eyes bottle green above, paler at the sides and beneath ; vesicle 

 olivaceous brown ; face and labrum cinereous ; labium pale yellow. 

 Prothorax : brown. 



Thorax : olivaceous on the dorsum, paler or greenish yellow at the sides ; 

 2 short, black, humeral stripes and a dark greenish, oblique stripe on the 

 side, which, latter stripe is bordered anteriorly and posteriorly with black. 

 Beueath frosted with blue. 



Legs black in the male but the femorse in the female reddish with a 

 black line on the outer sides. 



Wings hyaline ; site of arc variable, usually between the 1st and l^nd 

 autenodals, but sometimes at the 2nd or even slightly distal to it, this 

 being more often the case in the hindwing ; 8th nervure arising from the 

 anal angle of the trigone ; '2 rows of cells between 5 and ba. 



Stigma black 2 to 3 mm.; membrane greyish, occasionally nearly white 

 or nearly black. 



Abdomen broad ; the dilatation of the 2nd segment and the constriction 

 of the 3rd but poorly marked, somewhat depressed. The male ashy blue 

 or yellowish, especially the basal segments, the borders of the latter, the 

 distal end of the Hth and the whole of the remainder being black. The 

 sutures on the basal segments, including the transverse ridge on the 3rd, 

 finely outlined in black. The 3rd to the 6th segments each with a pair of 

 black spots beneath. In the female, the borders black and an irregular, 

 diffuse, dark, sub-dorsal line. 



Anal appendages black, the tips whitish. 



Genital organs of the male : lamina high and bold, the basal part, viewed 

 from the side, inclined to the body-axis at 45" furnished with a moderately 

 long, largish tuft of black bristles. The apex is deeply cleft into a slightly 

 diverging fork, nearly pointed and turning out at an angle of 90". Tenta- 

 culse not as high as the lamina ; the sides shallowly cupped, the internal 

 segment blunt and the hook directed laterally and horizontally. The ex- 

 ternal segment lower but prominent, flat and tumid. The lobe arched, and 

 thickly coated with black bristles. 



Genital organs of the female: border of the 8th segment dilated, foliate, 

 at the end of the 8th ventral plate, a narrow but deep fissure with no dis- 

 tinct separation from the vulvar scale ; 9th ventral plate swollen. 

 Hab. Kashmir ; throughout Europe and the south of England. 

 16. Orthetrum japonicum internum, MacLachlan. 

 Orthetrum intermcm, MacLachlan. 

 Expanse 70 mm. Length 38 mm. 

 Head olivaceous ; eyes brown above, paler, olivaceous laterally and 

 beneath. 



