g/j K. Takahasln. 



General consideration 



(1) At present 181 species of the subfamily Aphidinae arc known to 

 occur in Formosa. Of these species, 103 belong to the tribe Aphidina, 1G to 

 the tribe Greenideina, 12 to the tribe Callipterina, 15 to the tribe Lachnina, 

 26 to the trilie Hormaphidina and 9 to the tribe Pemphigina. The subfamily 

 Chermesinae is very scarce in species, containing only one unidentified species 

 attacking Pinus sp. It is very remarkable that the Greenideina and Hormaphidina 

 have many species, while the Callipterina and Pemphigina, as well as Chermesinae, 

 are relatively fewer in species. A similar fact is also seen in the aphid fauna 

 of Java. In Japan proper, however, the Greenideina and Hormaphidina are 

 very few in species, though the Pemphigina, Callipterina and Chermesinae have 

 many species. This indicates that the aphid fauna of Formosa is to he regarded 

 as Oriental rather than Palaearctic. 



( 2 ) The following cosmopolitan species have been found in Formosa : 

 Macrosiphum rosae L., M.pisi Kalt.. 31. granarium Kirhy., 31. sm/bonii Gillette, 

 Myzus persicae Sulz., Phorodon humuli L., RhopalosipJmm avenae Fab., Ji. 

 nyrnphaeae L., B. pseudobrassicae Davis, Aphis gossypii Glow, A. medicaginis 

 Koch, A. rumicis L., A. pomi De Geer, A. maidis Fitch, Toxoptera aurantii 

 Boyer, Brevicoryne brassicae L., Anuraphis helichrysi Kalt., Hyalopterus pruni 

 Fab., Lachnus viminalis Boyer, etc. 



(•°>) Of the 162 Formosan aphids, excluding the above named cosmopolites, 

 about 4.") species have also been found in Japan proper. Cavariella japonica 

 Essig et Kuw., Greenidea hawanai Perg. and Astegopteryx cuspidatae Essig et 

 Kuw., in Formosa, arc found only on high mountains (altitude more than 7000 

 feel . though they occur in low localities in Japan. 



According to P. van dor Goot, about 80 species of the family arc known 

 in Java, of these 31. including about 14 cosmopolites, have been collected in 

 Formosa. From India, about 60 species have been recorded, of which "27. 

 including about 17 cosmopolitan species, have been discovered in our island. 

 The species hitherto recorded from China and the Philippines are not sufficiently 

 numerous to be considered here. 



from our present knowledge, the aphid fauna of Formosa appears to be 

 very closely related to that of Japan proper. However, as further thorough 

 researches are made on these infects in China, the Philippines, India, the Malay 



