Aphididae of Formosa. — 3. 



63 



The number (if liairs on the dorsal surface of the body of the nymph of 

 Myzocallis pseudoalni Takah. 



Myzocallis bambusifoliae Takah. 

 Aphididae of Formosa, part 1, p. 73 (1921) and part 2, p. 123, pi. II, B, fig. 

 6(1923). 



Winged viviparous female. 



Antennae covered with a few cottony Becrutions as in Myzocallifi arundUoh'rifi 

 Clark. Tlic basal 8 abdominal segments each provided with a pair of small oblong 

 dusky spots at the middle of the dorsum. A very small blunt tubercle, which is 

 provided with a rather short hair at the apex, arif5ing from the hind part of eacli 

 dusky spot on the dorsum. 



Myzocallis arundinariae Essig, M. arundicolens Clark, and 71/. hamhusifoUae 

 Takah. are very closely related to one another, but are distinguisliable as follows: 

 ( 1 ) Abdomen with dusky markings on the dorsum. (2) 



Abdomen without dusky markings on the dorsum. (The 3rd antennal joint 



with the apex and a band near the base black) arundicolens Clark. 



( 2 ) The 3rd antennal joint black throughout arundinariae Essig. 



The 3rd antennal joint black at the apex and the hsim...hamhusifoUea Takah. 



A few winged viviparous females of BI. hamhusifoUae Takah. were collected 



by Mr. M. Kurisaki at Tadono in Wakayama-prefecture, Japan. Hitlierto unknown 

 from .Japan, 



