32 Records of the Indian Museum. [Vol. XIX, 



The black on the dorsum of thorax external to the humeral 

 bands is incomplete posteriorly where it changes to ochreous. 



The black on the abdomen is more diffuse and is set in a 

 background of reddish orange. Lastly, the stigma has not the 

 reddish tinge. 



One specimen taken by Dr. N. Annandale on Barkuda Island, 

 ChilkaLake, Ganjam District, Madras Presidency, among herbage, 

 20-8-1919. 



{Hi) Heteromorph form. 



Very similar to the foregoing from which it differs in the 

 following particulars : — The postocular space is bright ochreous, 

 the eyes are greenish, the humeral bands are unenclosed but as 

 the sides of the thorax are ochreous, the yellow of the humeral 

 bands is well displayed. The abdomen of the same ground colour- 

 ing as in the male but the black marks differing considerably. 

 The black marking on the first segment in the form of a V with 

 its apex at the base of the segment, that on the 2nd segment, 

 wedge-shaped with its broadest part at the base of the segment ; 

 the bands on the last four segments narrow, incomplete basall}^ on 

 the 7th and 8th and apically on the gth and loth, the sides of these 

 four segments being reddish. A very fine, black, mid-dorsal line 

 runs from the 2nd to the 6th segment and this is crossed on each 

 segment, near the apex, by another fine, black line, the points of 

 intersection defined as tiny, black spots, largest on the Gth seg- 

 ment. 



This last form is of interest in that it closely resembles Isch- 

 nura rufostigma, Selys, and thus forms a connecting link between 

 the genus and the true Ischnuras. Were it not for the great dis- 

 parity in the size of this single specimen, it might easily be taken 

 to belong to the above-mentioned species. 



The specimen mentioned by Dr. Laidlaw as taken by Dr. N. 

 Annandale on the Cooum River, Madras, is, I believe, a female of 

 Agriocnemis pygmaea, dimorphism in this species being almost 

 infinite. I have collected in the neighbourhood mentioned almost 

 continuously for four years and have never once come across 

 R. nursei, which I believe to be a purely Northern species. I have 

 seen a painting of a male specimen taken at Pusa by Mr. T. 

 Bainbrigge Fletcher, 26-3-19, and another specimen from Nagpur, 

 so that the distribution, as at present known, stretches as a belt 

 across Northern India, from Karachi to the Chilka lyake, via Nag- 

 pur, Deesa, Pusa, Agra, and Dehra Dun. 



II. Description of a New Indian Odonate. 

 Enallagma insula, sp. nov. 



1 $ Barkuda Island, Chilka Lake, Ganjam District, Madras Presidency, 

 5-10-ig. Coll. N. AiDiandale. 



Head. — lyabrum whitish green, the base finely black ; frons 

 and clj^peus a whitish green, with a black streak across the ante- 

 clypeus ; a broad, black streak across the vertex ; the postocular 



