Aphidkiao of Porui.isa. — I. 33 



(S ) Cauda abruptly conical Anuraphis Del Guer. 



— Cauda not abruptly conical Aphis L. 



('•-)) Cornicles somewhat swollen Br achycolus Buckt. 



— Cornicles not swollen B rack i/slphotiiella n.g. 



Key to Formosan species of Rhopalosiphum. 



(1 ) The 4th antennal joint with no or 1-2 sensoria. R. nymphaeae (L.) 

 The 4th antennal joint with G-10 sensoria ( 2 ) 



(2) Rostrum reaching the middle coxae (3) 



Rostrum not reaching the middle caxae. ... B. papaveri n. sp. 



(o) Wingless viviparous females with some ver}' short capitate hairs. 



B. lahoi'ensis (Das.) 



Wingless viviparous females without capitate hairs 



B. pseudobrassicae (Davis.) 



Rhopalosiphum pseudobrassicae (Davis.) 

 Aphis pseudobrassicae, Davis, Canad. Ent., xlvi, p. 231 (l'J14); 

 Maki, Agr. Exp. St. Formosa, Bull. 103(1917); Swain, Univ. Calif. 

 Pub. tech. Bull. Coll. Agr. Expt. St. vol. 3. No. L p. 122(1019). 



Siphocoryne pseudobrassicae. van der Qoot, Contrilj. Fauna Lid. 

 Neerland. i, iii, p. 64(1917); Theobald, Bull. Entom. Research, viii, p. 

 289 (1918). 



Siphocoryne indobrassicae. Das, Memoirs Ind. ]Mus., vi, p. 188 

 (1918). 



Hosts. — Baphanus; Brassica spp; Banunculus sceleratus ; Capsella 



bursa-pastoris. 

 Distribution. — Formosa (Taihoku): Japan. 



Java (v.d.G.); India (Das); Africa (Theobald, Davis); 

 North America. 

 Dr. Shiraki collected some winged and wingless females in the 

 islands of Boko, Formosa, in April 1920. 



Bhopalosiphum nymphaeae (L.) 

 Aphis nymphaeae, Linnaeus, Syst. Nat., ii, p. 714(1767), and Fn. 

 Suec, p. 983 (1789); Kaltenbach, Mono. Pflanz., p. 104(1843). 



