178 HYDROMETBIB.i:. 



pale fuscous, first, third and fourth joints longest and subequal, 

 second shortest. 



Length 12 millim. 



Hah Ceylon ; Pundaluoya (Green). — Philippine Islands (6'iHion). 



5JG4. Gerris graciliconiis, Horv. (Limnotrechus) A)?n. Soc. Enf. Behf. 

 xxii, p. cix (1879). 

 Gerris selma, Kirk. Entomologist, xxxvi, p. 181 (1903). 



Brownish-ochraceous ; head and anterior lobe of pronotuiii 

 piceous ; a small spot in front of eyes, lateral margins and a central 

 fascia to anterior pronotal lobe brownish-ochraceous ; body beneath 

 greyishly pubescent ; rostrum, acetabula, legs and apex of abdo- 

 men ochraceous; abdomen above piceous, the connexi\um brownish- 

 ochraceous ; antennae ochraceous, the third and fourth joints 

 infuscated, basal joint longest, almost but not quite as long as 

 second and third together; lateral angles of pronotum prominent. 



Length 14 to 15 millim. 



Hah. Sikhim ; Mungphu {Atldnson). Assam. — Japan ; Xorth 

 China. 



9G5. Gerris nitida, Mayr (Ilydrometia), VerJi. z.-b. Ges. Wien, xv, 

 p. 443 (180.5) ; id. (Ilydrometra) lieise Nov., Hem. p. 170, fig. ol 

 (1806). 



Head and pronotum black, shining ; hemelytra piceous with a 

 violaceous x-eflection, the veins black ; head with two longitudinal 

 lines above within eyes, and the under surface, rostrum (excluding 

 apex), two small linear spots on anterior area and the lateral and 

 posterior margins of pronotum, and the legs ochraceous ; sternum 

 and abdomen silvery -grey tinged with luteous ; lateral areas of 

 sternum, apex of rostrum, and abdominal spiracles black ; lateral 

 margins of abdomen ochraceous ; antennae with the first and 

 second joints dull ochraceous, their extreme apices and the third 

 and fourth joints fuscous ; first and fourth antennal joints sub- 

 equal in length and longest, second and third shorter and almost 

 subequal. 



Length 6 to 8 millim. 



Hah. Trivandrum (-Bri7. J/it.?.). Ceylon; Peradeniya {Green). 

 Burma ; Eangoon (Fea). 



B. Antennce tvith the hasal Joint longest ; second, third and 

 fourth joints almost suhcqual. 



'J66. Gerris fossarum, Fabr.{Cimex) Syst. Ent. p. 727(1775); id.{Cmiex) 

 Spec. 7?i*\ii,p.37o (1781) ; id. (Cimex) Mant. Ins. ii. p. 308 (1787) ; 

 8tdl (Limnogouus), Hem. Fahr. '\, p. 133 (1868). 

 Genis discolor, Sial, Frey. Etty. Resa, Ins. p. 265 (1859) ; id. 

 (Limnogonus) Ofv. Vet.-Ak. Fork. 1870, p. 705. 



Olivaceous-black, shining ; a longitudinal line on each side of 

 head within eyes, a spot on inner margin of eyes, lateral and 



