34 i;. Takahashi. 



Aphis plaiitarum nquaticu7n, Fabricius, Eiit. ISyst., iv, p. 214 (17'.»4). 



Aphis (ujuuticd. Jackson, Oh id Naturalist, viii, p. 248 (1907). 



njiojxdosiphnm iijiinpltnejtr. Koch, Die Pflanz. , p. 44, fig. ")7 (liS-"')7); 

 Buckton, Mono. P.rit. Apliiil.. ii, p. 12. pi. xli (1877); Cockerell, 

 8i-ii'ii<'c. x.xii. p. 7(J4 (r.MI.")); Davis, Kutom. News, xxi, p. 24r)(l!)l()); 

 Theobald, Kiilomologist, xliv. p. 18 (I'Jl 1); Patch, Maine Agi'. ivxpt. 

 St. Hull. 202, p. 171 (11)12), und Science, xlii. No. 1074, p. 1(*.4 (191.")); 

 Davidson, Jo ui'. Eeou. Kntoni. x, p. :5r)0 (1917); Essig and Kuwana, 

 Proc. Calir. Ac. 8c. 4tli series, viii. :'., p. (12(1918). 



Siphocoryne luimphneat. Theobald, Uull. Knt. Res., vi. p. \\^ 

 (I'.ii:.): Das, Mem. Ind. Mus.. vi. ]). IDl (191S): Matsuniura. .Tour. 

 Coil. Agr. Sapporo vii. j)!. (",, p. ;;.")'.) (I'.I17): Swain, Tniv. Calif. l'ul>. 



Tech. lUiil. iii. i. p. i;;:; (1919). 



Siphonaphis ntimphaeac, van der Qoot, Kenntnis Holand. Blattl. 

 p. 239(19].")). and Contril.. Fauna Ind. Neerlnnd.. i. iii. ].. 09(1917). 

 Hosts. — Nymphaea sp ; Pi.^fia straiiotes; Primus communis; jSelumlo 

 aucifera. 

 1 )i<triliution. — Formosa (Tail iol<u): Japan (Tokio, Sapporo). 



.lava (v.d.dr.): India (l^as); Africa (Theoliald); Europe: 

 Nurtli America. 

 Hitherto unrecorded from I'\>rmosa. 



/'. nymphaeae, in Foi'inosa, lives on variou> aipiatie jilants tlu'ough 

 the year and is very rarely found on Prunv^, although in the temperate 

 country it is eonimon on various aquatic plants dui'ing the summer and 

 spends the winter on Prunus sp. The species is viviparous through 

 the year in Formosa. 



Rhopalosiphum pajtarrerl n. sp. (I'L. xiii, 1, tigs. 1-b) 

 Descrihed from specimens preserved in alcohol. 



Wingless viviparous female. 

 I )irty yellow. Eyes red. Antennae dirty yellow, with the distal 

 half dusky. Cauda paler. Cornicles paler, dusk}- at the apices. Legs 

 paler; apices of tihiae dark brown; tarsi black. Anal plate dusky. 



