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



stigmatic vein obsolete, booklets two. Both the first and second abdom- 

 inal segments with two small tubercles on the dorsum, the tubercles on the 

 second larger; abdominal segments 1 to 4 inclusive, bearing small lateral 

 tubercles. Cornicles very short, broader than long, broadest at the base, 

 not constricted in the middle. Cauda globular. Anal plate bilobed. Legs 

 slender, with short fine hairs, empodial hairs present. 



Length of body 1.6 mm. 



Length of antenna 1.2 mm. 



Length of forewing 1.7 mm. 



Host Zelkowa keaki. 

 Locality, Tokio. 



This interesting aphis is common on the underside of the 

 leaves of Zelkowa keaki and often it is found also on the leaves 

 of cultivated beans. 



The viviparous females always have wings and as is charac- 

 teristic of the Callipterina they are sporadic in habit and are 

 easily roused, the least disturbance causing them to jump from 

 the hosts. 



^ 



FIG. i Myzocallis zelkowae antennal structure. 



I have not found the sexuales of the species. 

 Described from a number of co-type slides, one sent to the U. 

 S. National Museum and the others retained by the writer. 



Greenidea kuwanae (Pergande). 



This aphis is very common on the young shoots of Onerous 

 from May onwards throughout the summer. The stem-mother 

 is apterous and many winged forms, as well as wingless ones, 

 appear in the second and the following generations and the 

 oviparous female which appears in December has wings. I have 

 never collected the male insect. 



The oviparous females of Aphididae are usually wingless, but 

 I have found that the oviparous females of the following species 

 always have wings: 



(1) Greenidea kuwanae Pergande. 



(2) Trichosiphum tenuicorpus Okajima. 



(3) Cervaphis quercus Takahashi (Zool. Mag. Tokio, vol. XXX, 



