PROC. ENT. SOC. WASH., VOL. 21, NO. 7, OCT., 1919 175 



p. 458). Greenidea and Trichosipkum belong to Trichosiphina, 

 and Cervaphis belongs to Cervaphidina. 



In Trichosipkum pasaniae Okajima the winged viviparous fe- 

 male is very rare, as in Cervaphis and the sexuales probably have 

 wings. 



Nippolachnus piri Mats. 



This aphis is one of the most injurious pests of the pear-tree in 

 Japan, and it is found on the underside of the leaf. 



Most of the aphids belonging to Lachnina have no alternate 

 hosts and may be found on the branches or stems of trees. But 

 Nippolachnus piri Mats is double-hosted, spending the winter 

 and spring on Eriobotrya japonica and the summer and early 

 fall on the pear-tree. 



The viviparous females of the second generation and the sex- 

 uparae have wings, but the other females are wingless. The 

 sexuales appear in November and the male has wings. 



This very interesting aphis somewhat resembles Anoecia, but 

 belongs to Lachnina doubtlessly. 



Chaitophorinella acerifoliae Takahashi. 



C. acerifoliae Takah., Zool. Mag. Tokio, vol. XXXI, 1919. 



Closely related C. testudinata Thorn., differing, however, in the 

 following point: 



The proximal part of the last antennal segment is nearly one 

 half the length of the distal part. This species is common on 

 the leaves of Acer palmatum in spring and often it is found on 

 Acer carpinifolium and Aescnlus sp. The dimorphs margined 

 with many lamellae are produced by the females of the second 

 and the following two or three generations and in summer only 

 the dimorphs may be seen. The stem-mother is wingless, and 

 winged forms appear in the second and the subsequent genera- 

 tions very commonly as in some Chaitophorus . 



Chaitophorinella koelreuteriae Takahashi. 

 C. koelreuteriae Takah., Zool. Mag. Tokio, vol. XXXI, 1919. 



This species is distinguishable from C. acerfoliae Takah. in the 

 following characters: 



1. Body larger. 



2. Eyes smaller. 



3. Larva (first instar) yellow or yellowish green. 



4. Wingless viviparous female yellow or black. 

 Host. Koelreuteria macroculata . 



Many dimorphs margined with lamellae are produced by the 

 females of the second and the following generations. I found in 



