APHIDIDJ2 OF rOKMO.SA. 172 



(Host plants) 



Cnrjiinus yedocnsis : tlie lower skies of the twigs are attacked. 



Carpinus japonica : the lower surfaces of the twigs are rarely alfcicked. 



(Season when the species is coiumou) 



Near Tokj'o tliis aphis ma}' Ix; found U(.)t uucouuuuuly from spriug imtil 

 fall, sometimes occumug in large numbere on Carpinus yedocnsis. 



(Winged viviparous female) 



The vivipai'ous females are always provided with wiugs. 



(Male and oviparous female) 



The winged males and wingless oviparous females make their appearauco 



from the last of October to the middle of November. The male? are scarce. 



(Intermediate) 



I have obseiTed some brachj'pterous vivipavoas females. 



(Notes on the life history near Tokyo) 



The adults of the first generation, 

 which are winged like tlKjse of the 

 other generations, appear at the Ije- 

 ginning of May and disappear entirely 

 aljout the 20th day of the same month 

 when those of the second generation 

 appear ; the females of the third 

 generation reach maturity about the 

 7th day of June and those of the 

 fourth at the end of the same month. Eggs o5 ChromaphU cirphdrda. 



Tlie eggs ai-e yellow in colour when newly produced, gradually darkening 

 to black and are conspicuously vaiiable in shape as shown in the figures. The 

 eggs ai-e dej^wsited upon the stems or branches of Carpinus. 

 (Habit) 



This aphis, especially the uymj)h, is quite inactive and rather sedentary, 

 resting on the lower side of the twigs, and does not jump nor elevate the 

 l»sterior pair of legs when disturbed. 

 (Distribution) 

 Japan : Tokyo. 



