B 0MB A Y HEMIPTERA . 170 



Fam. Gerrid^. 



* 62. Onychotrechus saJcuntala, Kirk. 

 The specimens are intermediate between this form and O. rhexenor, Kirk., 

 which must be united, as suggested by Distant. Mr. Wroughton found 

 both the winged and the apterous form. The latter is coloured almost as 

 the same form of O. vadda, Dist., but the second antennal joint is much longer 

 than the third, the middle femora are a trifle shorter than the posterior 

 ones, and the slightly curved setiform apical appendage of the middle and 

 hind tarsi — a formation well represented by Mr. Distant's drawer in a 

 detail-figure of O. vadda, but not mentioned in Kirkaldy's and Distant's 

 descriptions — is shorter, more slender, and not fimbriated toward the base. 

 This tarsal appendage is lacking in the allied genus Eotrechus, Kirk., but 

 occurs, more or less modified, in some other genera of Gerridje. The claivs 

 in the species of Eotrechus and Onychotrechus are very dissimilar to those of 

 the other Gerrids, being long and rather stout, evenly curved in Eotrechus, 

 straight and only apically curved in Onychotrechus, in both genera provided 

 with long free arolia. It might be inferred a piiori that their habits are 

 different from those of the other Gerrids, and from a very interesting obser- 

 vation made by Mr. E. E. Green in Ceylon there can in fact be no doubt 

 that they do not live on the surface of ponds or streams like the other 

 " water-striders." He found Onychotrechus vadda " on perpendicular rocks 

 with trickle of water : going in pairs, not actually in coitu, but the male 

 clinging on back of female." These insects could certainly not climb pre- 

 cipitous wet cliff's with claws constructed as in the other Gerridte, least of 

 all with a burden on their back. 



Fam. Belostomatid^e. 



63. Sphcerodema rustica, Fabr. 



Suborder Homoptera. 



Fam. FulgOrid^. 



*64. Putala viaculata Dist. 



Fam. Oercopid^. 



*65. Cosmoscarta relata Dist. 



Fam. MBMBRACiDji:. 



66. Leptocentrus taurus Fabr. 



Some specimens agree better with Z. subsiitutus, Walk., but the differ- 

 ences between these two species are so slight that I think they cannot be 

 separated. 



Fam. PsYLLiD^. 



67. Diaphorina guttulata, Leth., Proc. Asiat. Soc. Bengal 1890, p. 165. 



