Al'HU)ir>.E OF FOKMoVA. 



141 



Xippolaclanus piri Mats. 



(Host plants) 



A. Summer host. 



Firm scrotina : tLe lower surfaces of the lea\es, aloDg the midrib-:, ale 

 attacked. 



This insect is present on tliis plant from al>out the middle of Sla}- until 

 the last of September. 



B. Winter hosts. 



Eriolotnja japonica : the lower sides of the leaves, along the niidiibs, are 

 attacked. The aphis passes the winter on this plant in the egg conditit.)U. 



Raphiolcpis japcniica : the aj)his seems sometimes t'j pass the winter 

 nionths on this plant, since many winged viviparous females and theii- nymphs 

 were observed on the under surface o! the leaves on Jouo l:!, 1917, near 

 Tokyo. 



(Season when the insect is common j 



Near Tokyo this insect is not uncommon each year, sometimes occurring 

 in large numbers on the summer, as well as, on the -sNiuter hjst. 



(^\iuged viviparous female) 



The females of the second generation, which migrate to the summer host 

 fiom the middle of May until the beginuiug of June, and the .=exupavw, which 

 rttm-u to the winter host in the fall, are provided \\ith v.ings, but those of 

 other generations are always entirely ■wingless. 



(Male and oviparous female) 



The ^\•iuged males and the wingless oviparoas females iiiake their appear- 

 ance on the Eriohofi-//'i japonitu in Octjlier and November. Tli3 ii.ales are 

 almost identical in colour with the winged vi^'iparous females, difleriug fiom 

 them, however, in not secreting white was fivm the dorsa. They are not rare, 

 rdthough much scarcer than the feiuales. 



(, Intermediate) 



No intermediates are found among my siJccimeus. 



(Notes on the Ufe history near Tok^d) 



The eggs hatch about the 20th day of March. The first geLevation (steiu- 

 niother) consists onlv of the wingless individuals, but the st.'C'iaid generation in- 



