E. Takahashi. 



;, "mini Takah., SMvaphis cettiD&s, NeophyUaphis podocarpi Talcali., Phyllaphoides 

 bambusicola Talcali.. Etdachmcs pini/ormosanus Takah., Oregma lanigera Zehnt., 

 0. bambusifoliae Takah.. 0. bambusicola Takah.. Astegopteryx fici Takah., A. 

 ij n rcicola Takah.. etc. 



Alesia discolor Fab. feeding on Macrosiphum formosanum Takah., 31. 

 formosartemisiae Takah. and NeophyUaphis podocarpi Takah. 



Chilomenes 6-maculata Fab. feeding on Macrosiphum formosanum Takah. 



Aspidimerus orbicularis (nil. feeding on Aphis gossypii Glov. and SMvaphis 

 < , Hi Das. 



CoccineUa sp. feeding mi Macrosiphum gobonis Mats. 



Coccinella 1-punctata L. feeding on Macrosiphum gobonis Mats, and 

 Rhopjlosiphum "pseudolrrassicae Davis. 



Leis Ib-m.aculata Hope feeding on NeophyUaphis podocarpi Takah. 



Propylea conglobata L. feeding on Aphis gossypii Glov.. Macrosiphum 

 : rmosanum Takah.. J/, gobonis Mats., etc. 



Synonycha grandis Thunb. feeding on .IjJ/is saliceti Kalt , Oregma lanigera 

 Z -hut. and bambusicola Takah. This and Scymnus sp. are the most effective 

 enemies of Oregma lanigera. 



Scymnus sp>. feeding on Aphis gossypii Glov. and Oregma lanigera' Zehnt. 



Scymnus sp. feeding on Macrosiphum gobonis Mats, and Aphis malvoides 

 \. d. Goot. 



It is a very interesting fact, moreover, that these beetles sometimes eat 

 c srtain fungi and pollen. 



(Hv noptera) Some fossorial' wasps an- known to eat the aphids, though 



ha never hern observed in our island. Each of the families Braconidae, 

 Chalcididae, Proctotrupidae, etc. includes many aphid-parasites. According to 

 i Deventer, Oregma lanigera is parasitized by Encarsia jlavoscutellum Zehnt. 

 Java, but in Formosa, so far as I know, there are no Hymenoptera parasitic 

 upon tin- aphis nor on other species of Oregma. The parasites of the 

 Callipterina in our island have likewise never been discovered, and those of 

 lidea i m to be quite scarce, only a few specimens having been collected. 

 The egg-parasites of the family are extremely scarce. In Formosa almost all 

 the species of thee insect; are viviparous throughout the year, no egg-parasites 

 having In en observed. The winged viviparous females of Macrosiphum formosanum 

 Takah. Miinel'ie. become brachypterous forms, when they are parasitized by a 



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