344 Records of the Indian Museum [Vol. VIII, 



the upper pair are distinctly hatchet-shaped (the blade of the 

 hatchet being partly visible from the side) and not cylindrical. 



In spite of these differences I believe Mr. Stevens' specimens 

 must be identified with de Selys' species ; the agreement in other 

 respects is very close, and if looked at from above obliquely, the 

 upper anal appendages do appear to be cylindrical. 



Mr. Stevens has extended the known range of this form very 

 considerably ; it has hitherto been recorded from Sumatra and 

 Siam. 



40. Aciagrion pallidum, de Selys. (PI. xvi, fig. 4.) 



I cf , 2 9 $ Dibrugarh, N. E. Assam, Abor Expedition, 

 17 — 2i-xi-ii (5. W. Kemp). 



Length of abdomen cf 32 mm. $ 29 mm. 

 ,, hind- wing cf 19 mm. 2 19 mm. 



Postnodals lo-ii. 

 These specimens, which have been preserved in spirit, differ 

 to some extent from those described by de Selys. 



They are a little larger. The type male had the abdomen 

 28-29 mm. long. 



The post-ocular mark is a light greenish-rjrown. 

 The thorax has in both sexes a fine antehumeral line of pale 

 metallic green, and there is a lateral stripe of the same colour. 

 The abdomen of the male has i 7 metallic black above, 8-10 almost 

 white, 10 is very short. 



In the females, 6, 7 have a dorsal longitudinal dark stripe of 

 metallic black, the rest of the abdomen is very pale brown above, 

 and white below. 



The appearance of the anal appendages seen from the side is 

 figured for comparison with those of A . borneensis , Ris. 



41. Ischnura rufcstigma, de Selys. (PI. xvi, fig. 5.) 



I cf Dibrugarh, N. E. Assam, Abor Expedition, 17 — ^21- 

 xi-ii (S. W. Kemp). 



The specimen is a trifle smaller than the type, which I believe 

 to be the only example of the species hitherto known. 



The colouring agrees generally with that of the type. The 

 post-ocular spots are however small, the sides of the thorax and 

 prothorax are of a blue-green shade, not " roux jaunatre." 



The whole of the dorsal surface of segment 8 of the abdomen 

 is black. 



The difference between the pterostigmata of the fore and 

 hind wings does not seem to me to be very marked. It is empha- 

 sized by de vSelys in his description. 



Unfortunately the female of the species remains unknown. 



The insect is a very handsome one. It is interei,ting to be 

 able to give a more precise localization for the species than the 

 rather vague indication, India. 



42. Pseudagrion sp. 



I ? Dibrugarh. 



