926 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Pol. XXVI. 



Abdomen black marked with yellow as follows : — all the dorsum of the 

 Ist three segments, the colour here being traversed by fine black lines at 

 the sutures and transverse ridges ; a window-shaped mark consisting of 

 four panes on the 4th segment ; oval dorsal spots on the .5th to 7th, 

 decreasing in size progressively as traced backwards ; the sides of the 

 first three segments, the yellow here being separated from that on the 

 dorsum by a black line ; beneath a broad midventral spot on all segments 

 from 1 to 7, 



The basal marking of wing is usually not as extensive as in the adult 

 forms and is of a deep golden brown. 



Female very similar to teneral males, but the whole insect more robust 

 and the abdomen thicker and nearly cylindrical. In the male this is slim 

 and strongly keeled and the last few segments are a little dorso-ventrally 

 dilated. The yellow is more extensive and the black markings conversely 

 less in evidence. 



Head : eyes puce brown above, pale lilaceous grey at the sides and 

 beneath ; vesicle and upper part of forehead not metallic, the former 

 brown, the latter and the face pale dirty yellow. 



Thorax pale brown on the dorsum, the mid-dorsal and humeral regions a 

 little darker and usually the latter bearing traces of a fine black line. 

 Laterally the sides are pale yellow with similar but finer black lines as 

 seen in the male. 



Abdomen a pale reddish or olivaceous brown, somewhat variable with 

 black margins which gradually encroach on the pale dorsal area and 

 meet over the dorsal carina on the last three segments. The sides of the 

 fist three segments yellow. Legs yellowish brown. 



Basal spot of hindwing bright golden brown. Some specimens have the 

 apices of all wings tipped with brown as far as the distal end of stigma. 



Hab. Throughout India, Ceylon, Burma and Indo-China, New Guinea, 

 Borneo, Java, Formosa, Mesopotamia, Asia Minor. The insect is extre- 

 mely common and is found throughout the year except in the Northern 

 areas in the cold season. 



It is not often seen away from water and prefers running to still waters. 



Females are comparatively rare. 



61. Trithemis pallidinervis, Morton, 1907. 



Sympetritm pallid inervis, Kirby, 1889, Id. Cat., 1890. 

 Trithemis dryas, Selys, 1891. 

 Diplax dryas, Martin, 1904. 



Expanse 71 mm. Length 43 mm. 



Male and female very similar in appearance, the later however is paler 

 and the yellow markings greater in extent on the abdomen. 



Head : eyes reddish brown above, brown at the sides and slate blue 

 beneath ; vesicle, upper and front part of frons iridiscent, metallic purple 

 in the male and light yellow in the female, in which there is only a broad 

 basal line to the forehead, metallic blue green ; epistome and labrum light 

 brown in the male, very pale yellow in the female ; labrum yellow with 

 black borders ; occiput olivaceous or yellow. 



Prothorax dull brown. 



Thorax dull brown with a diffuse blackish brown mid-dorsal stripe and 

 on the sides which are pale yellowy a post-humeral and two lateral black 

 stripes, the front one crossing the spiracles and the hind over the posterior 

 suture. 



The humeral stripe curves abruptly back below but does not quite touch 

 the stripe crossing the spiracle; which latter is incomplete above. In 



