364 Records of the Indian Museum. [Vol, XVI, 



notum; the black patch on the anterolateral area more distinct and 

 rounded; pronotum not so long as in the macropterous form; 

 abdomen above black as far as the sixth visible segment, remain- 

 ing segments bright reddish ochraceous, the entire surface very 

 hairy. 



Length 2 miUim. 



Type No. 8379/Hi in the collection of the Zoological Survey 

 of India, 



Gerris (Limnogonus) tristan, Kirk. 



A single specimen from a stream in dense jungle above Tura, 

 3,800 ft., 15.vii-31.viii.1917. 



A very common and widely distributed species. 



Chimarrhometra orientalis (Distant). 



1879. Halobates ? orientalis, Dislant, Trans. Ent. Soc. Lond ., p. 126. 

 1879. ,, ., /(/. (ijen. ?) Sec. Vark. Miss., Rhvn., p. 12, 



ft. II, 12. 

 1896. Cliimarrhometra orientalis, Bianchi, Aniniaire Miis. St. Petersb., 



p. 71.- 

 1904. ,, ,, Distant, Fauna Brit. Ind. Rhv., 11, 



p. 190. ' ^ 



1908. Rlieiimatotvecliiis liimalayaniis. Kirkaldy, CanaiL Ent., XL, 



p. 452. 

 1910. Gerris monticola. Distant, Ann. Mag. Nat. Hist. (8) V, p. 141. 

 1910. ,, ,, Id., Fauna Brit. Ind. Rhy., V (Appendix), 



p. 142.^ 

 1910. Rheiimatotrecli us liimalayaniis, Kirk., Distant, Fauna Brit. Ind. 



RJiy., V (Appendix), p. 151. 



One winged and five apterous females from the same locality 

 as the preceding species. 



The generic position of this species is doubtful. It has 

 evidently been described under various generic and specific names 

 by different authors. Distant himself has described it under two 

 different genera. He based his original description on the 

 structural character of the basal joint of the anterior tarsi but there 

 appears to be a misunderstanding on this point. The male genitalia 

 form a very good character for distinguishing the genus. Distant's 

 description of Gerris monticola was taken from a macropterous 

 female, while that of Halolates? orientalis was taken from an apter- 

 ous male. We have in the collection of the Zoological Survey of 

 India the type of Halohates? orientalis as well as the co- types of 

 Gerris monticola. There is no doubt that Kirkaldy' s species is the 

 same as G. orientalis. It is common in Hmialayan streams. 



Eotrechus kalidasa, Kirk. 



One apterous specimen from above Tura. 



This species was not hitherto represented in the collection of 

 the Zoological Survey of India. I have no doubt that the speci- 

 men is specifically identical with the winged form described from 

 Karenee, Burma, by Distant. 



