CH. IV] DRAGONFLIES 121 



(69) 66. Spot circular. 



genus hchnura. Abdomen black ; part or all of segment 



8 blue in . Pterostigma more or less yellow ; darker 

 on front-wings than on hind of <$ . Nodal sector at 

 level of 4th post-cubital nervure on fore- wings, of 3rd 

 on hind-wings. 



2 species : 



(68) 67. /. pumilio, Charp. 9th segment and part of 8th blue in 



male: hind lobe of prothorax rounded and raised. 



Nervures of wings pale brown in both sexes. Length 



of g 28 31'5 mm., $ 27*5 32 mm. Expanse of wings 



$ 3034 mm., ? 3337 mm. [Very rare.] 

 (67) 68. /. elegans, Lind. 9th segment black, whole of 8th blue in 



both sexes. Hind lobe of prothorax narrow, much raised. 



Nervures of wings dark. Length of $ and $ 30 33 mm. 



Expanse of wings $ 3335 mm., $ 35 37'5 mm. 

 (66) 69. Blue spot behind eyes not circular. 

 (71) 70. Spot oblong. Mid and hind tibiae dilated. 



genus Platychnemis. Legs pale blue with fringes of black 



hair. Colour of body blue with black markings. 

 1 species : PL pennipes, Pall. Length of <$ 36 37 mm., 



$ 3638-5 mm. Expanse of wings $ 4346 mm., 



$ 45 48mm. 



(70) 71. Blue spot behind eyes pear-shaped : tibiae not dilated. 

 (77) 72. genus Agrion. Abdomen blue and black. Pterostigma 



bluish with black centre, alike on both wings. Nodal 

 sector level of 5th post-cubital on fore- wings and of 4th 

 on hind-wings. ? with no apical spine on ventral 

 surface of 8th segment. 



3 species : 



(76) 73. U-shaped mark on second abdominal segment of . 



(75) 74. A. pulchellum, Lind. with dorsal U-shaped black mark 

 on 2nd abdominal segment united to black ring behind 

 it : $ blue and black. Length of 32 36'5 mm., 

 <j> 34 36 mm. Expanse of wings 36 41 mm., 



9 4450 mm. 



(74) 75. A. puella, Linn. U-shaped black mark on 2nd abdominal 

 segment of free from black ring behind it : $ black- 



