Aphidictoe of Formosa— 4. 57 



Phoroddn hamuli Schrahk. 



Numerous apterous viviparous females were observed on Humulus japonicus 

 on January 14, 1025, at Taihoku. 



Trichosiphonaphis polygoniformosanus Takah. 



Numerous brownish yellow apterous forms were observed on Polygonum 

 perfoliatum on August 1G, 1923, at Taihoku. 



Rhopalosiphum avenue Fab. 



Oryza sativa : some viviparous females were observed on this plant in a 

 glass house on April 24, 1923, at Taihoku. 



Rhopalosiphum nymphaeae L. 



Primus communis: abundant on February 25, 1923, at Taihoku. 

 Salvinia natans : a few nymphs on October 14, 1923, near Taihoku. 



Aphis fovaresi Del Guercio. 



Citrus sp. : winged and wingless viviparous females were abundantly 

 observed on October 15, 1923, at Sozan near Taihoku; numerous winged ones 

 were collected in March, 1924, at Heito. 



Hyalopteru8 pruni Fab. 

 Prunus communis: abundant on May 14, 1924. at tSlmshu, Taichu-prefecture. 



Greenidea taiwana Takah. 



Meliosma rigida: apterous forms were abundant in June. 1924. at Shinten, 

 near Taihoku. 



Eutrichosiphum minutum Takah. 



A few apterous forms were collected on Trachelospermum jasminoides 

 on October G, 1924, near Taihoku. 



Eutrichosiphum lithocarpi Maki. 



Castanopsis subacuminata : many viviparous females, both winged and 



