i82 Memoirs of the Indian Museum. [Vol. V, 



Gerris nitida (Mayr), Distant, vol. II, p. 178 and vol. V, p. 142. 



A few specimens of this pond-skater were taken among rocks at the edge of the 

 lake at Ganta Sila in December. It is widely distributed in India, Burma and Cey- 

 lon, ascending the Himalayas to an altitude of at least 7000 ft. 



Gerris fossarum (Fabricius), Distant, vol. II, p. 178 and vol. V, p. 142. 



Specimens were taken at Ganta Sila in winter and at Nalbano in the " rains." 

 The species is common on pools of brackish water in the Gangetic delta and has a 

 wide range in the Oriental region and Australia. It occurs in the Dar jiling district 

 at an altitude of 7000 ft. 



Gerris tristan, Kirkaldy, Distant, vol. II, p. 179 and vol. V, p. 144. 



A few specimens were obtained at Nalbano, Barkul and Ganta Sila in September 

 and December. The species was described from Ceylon and has since been recorded 

 from various localities in India and Burma. It is common on brackish water in the 

 Gangetic delta. 



Gerris spinolae, Leth. and Serv., Distant, vol. II, p. 180. 



G. spinolae is occasionally found near the inner shore of the main area of the lake 

 in winter ; in the <c rains " it enters this area in considerable numbers from ditches 

 and flooded rice-fields, in which it is very abundant. The species occurs in many 

 parts of India, Burma and Ceylon, and also in China. 



Euratas formidabilis , Distant (see p. 183, postea). 



Family Nepidae, 



Ranatra sordidula, Dohrn, Distant, vol. Ill, p. 22. 



A single specimen was taken at Ganta Sila in December. The species is widely 

 distributed in India and neighbouring countries. 



Family Belostomatidae. 



Sphaerodema rusticum (Fabricius), Distant, vol. Ill, p. 36, fig. 23. 



The species is found among weeds in the main area of the lake in the dry season. 

 It is common in India and the surrounding countries. 



Family Notonectidae* 



Anisops ? breddini, Kirkaldy, Distant, vol. V, p. 333, fig. 194. 



There is some doubt as to the identity of the Indian species ; our specimens from 

 the Chilka I^ake agree well with the one figured by Distant. They were taken at the 

 northern end of the main area of the lake in the freshwater season, the only time at 

 which we saw any Notonectid in the lake. The same species is, however, abundant 

 in pools of brackish water at Port Canning in the Gangetic delta, as well as in fresh 

 water at Calcutta. A. breddini was described, very imperfectly, from Madagascar. 



