36 K- Takahaslii. 



Host. — Quercus xj> . attacking the young shoot. 



Distribution. — Formosa: Tattaka near Musha in Taichiirprefecturc (altitude 

 about 7:530 feet). 



A single specimen was collected by the author on May 17, 19_!4. This 

 species differs from other species of Greenidea in possessing more sensoria on 

 the 3rd antenna] joint. 



Greenidea sp. 



Host. — Quercus sp. 



Distribution. — Formosa: Tattaka near Musha. 



Two nymphs wore collected by the author on May 18, 1!'24. These nymphs 

 are white in general colour, with white cornicles, and seem to represent a species 

 distinct from others known to occur in Formosa. 



Cervaphis quercus Takah. 



The cornicle figured in the former paper, Aphididae of Formosa, part - 

 (Plate V, B, fig. <)) is abnormal. Tin' cornicle of the apterous form is nsuallv 

 almost as in tin' winged form (Aphididae of Formosa, part 3. plate VIII, B, fig. 7). 



Lachnus niitakayamensis n. sp. 



Winged viviparous female 



Head, antennae and thorax black. Legs black, paler on the haves of 

 femora. Abdomen greenish black in specimens preserved in alcohol. Wings 

 without markings. Head divided, furnished with numerous long rather tine 

 hairs, of which those on the front are somewhat longer, almost as long as the 1st 

 antenna] .joint. Ejes distinctly protuberant, with the ocular tubercles very small. 

 Antennae covered with numerous, long, very stout bristles which are almost as 

 long as those on the front of the head; the ,">rd .joint almost as stout as the 

 front tibia, furnished with more than 100 very small, protuberant, circular 

 sensoria scattered over the whole length: the 4th and 5th each furnished with 

 about 43 similar sensoria scattered over the whole length; primary sensorium 

 >»ii the 5th or Gtli very large, circular; the 6th furnished with about 6-8 small 

 sensoria scattered over the basal part, the rlagellnni with some short setae at 

 the tip: the relative length of joints about as follows : III-LGO, IV-59, V-67, 

 \ l-H'.i (43+26). Rostrum lance-like, reaching beyond the hind coxae. Wings 



