INDIAN DRAGONFLIES. 



267 



Hab. — Ceylon and Southern India. I have taken this species in Madras, 

 but it is not common and very difficult to distinguish from Pantala flavescens 

 when on the wing. It is somewhat smaller than the latter insect, but 

 resembles it closely otherwise. It frequents open situations such as grassy 

 commons or hovers over low scruV. I have never seen it over water. 



In the key to the genera of the Libellulinte on page 618, Vol. XXV, 

 No. 4 of the Journal, Natural History Society, Bombay, I wrongly des- 

 cribed Macrodiplax as " dull coloured," the descriptions having been made 

 from faded specimens. Since then also, I have decided to include a 

 Mesopotamian species, n'z., 8elysiothemis nigra, and so now make the 

 following alterations to the key : — In line 4, " 3 cells " should be altered 

 to " 2 or 3 cells," and all below that line, in the key, should be deleted 

 and the following substituted : — 



X. Only 6 antenodal nervures. 



x' Neuration of wing greyish white and almost 

 invisible. Stigma bicolourous. 

 Discoidal field but slightly dilated.. .. Seh/xiotheniis. 



X- Neuration of wing black and distinct. 

 Stigma unicolourous. 

 Discoidal field widely dilated . . , , Macrodiplax . 



Y. Nearly constantly 7 antenodal nervures. 



Discoidal field, but slightly ailated . . . . V rothemis . 



Selysiothemts, Ris, 

 p. 70 



Geniis- 

 Ann. Soc. 

 (1897). 



— Selysiothemis. 



Ent. Belg., 41, p. 47 (1897)— Selys, ibid.. 



j^ig, 66. — Wings of Selysiothemis ni(jra (x 3). 



Head large ; eyes broadly contiguous, the optic suture longer than the 

 occipital triangle ; no distinct temporal projection to the eyes as in 

 Macrodiplax, only a slightly arched projection ; forehead without a sharp 

 foreborder, a little flattened in front ; suture deep ; vesicle large, broadly 

 arched and rounded. , • ,, ■> -, 



Prothorax with a small posterior lobe, depressed and spherically arched. 



Thorax narrow. Legs long and tolerably slim. Male ; hind femora with 

 a row of very closely set and very small spines ; mid-femora with ca. 10 



