IbU hydikkmethid.t:. 



long as or a little longer than the second and third joints together ; 

 pronotum \\ith a pronounced central longitudinal cariuation. 



Length 6 to G| niillim. 



Bah. Ceylon {Green). 



C. Antermo' ivitli the h as aJ joint very hm/, about as lone/ as 

 remaininr/ joints teilcen to[/ether. 



969. Gerris pallidum, Fetljr. Ent. Sijst. iv, p. 188 (1794); Amy. 8f 



Serv. Ih'iJt. p. 417 (1843) ; Herf.-Hchiiff. (Hydroiuetra) Wunz. ix. 

 pp. 67, 70, tig. 926 (ISoo) : Fieher (Hydrometra), JEiir. Hem. 

 p. 106 (1861). 

 Compl. 8yu. cf. Leth. ^- Sev. Cat. Gen. Hem. iii, p. 62 (1896). 



Black, opaque ; body beneath sih ery-grey pubescent ; base of 

 rostrum, coxic, trochanters and extreme bases of femora verj' pale 

 fulvous ; pronotmn with a strong central longitudinal carinnte 

 line : hernelytra with the vehis very strong and prominent ; legs 

 fuscous ; antenna; with the basal joint very long, about as long as 

 rhe other three joints taken together. 



Length 12 to 13 millim. 



Heih. Burma ; Karennee {Fea). — A weJl-known Palsearctic 

 species, already recorded from Turkestan. 



970. Gerris spinolse, Leth. S,- Sec. Cat. Gen. Hem. iii, p. 63 (1S96). 

 Genis argentata. Spin. Fss. Hem. p. 65 (1840), noiu. preeocc. 



Head, rostrum, pronotum and anterior legs black; intermediate 

 and posterior legs piceous-brown ; a central line to anterior area, 

 and lateral margins narrowly, a}id posterior margins more broadly, 

 of posterior area of pronotum brownish-ochraceous ; hemelytra 

 pale brownish, the lateral margins and the Aeins piceous : body 

 beneath thickly clothed with silvery-gre}' pubescence ; coxae, 

 trochanters, bases of anterior femora, base of rostrum and apex 

 of abdomen dull ochraceous ; head, pronotum and legs finely 

 pubescent ; pronotum transversely impressed before middle, its 

 posterior area with a distinct central longitudinal cariuation ; 

 antennae with the first joint about as long as the remaining joints 

 together, third joint nuich shorter than second, a little shorter 

 than fourth. 



Length 11 to 1'2.\ millim. 



//a6. "North India" {Coll. Sign.). Calcutta. Ceylon {Brit. 

 JJvs.). Burma : Toungoo {Fea). — China. 



Position uncerteiin. 



971. Gerris a.vmSita,, Spin. Fss. Hem. i^. Go (1840); 3Iai/r (Limnometra), 



IM.'se Nov., Hem. p. 175 (1866). 



" Apterous, hemelytra rudimentary ; intermediate coxte armed 

 laterally with a small spine " ; abdomen Ijlack abo\ e, a testaceous 

 spot on the disks of the third, fourth, fifth and sixth segments ; 

 in other respects the description of the species agrees with that of 



