Aphididae of Formosa. — 3. 43- 



Head, eyes, antennae, mesothorax and cornicles black. Cauda blackish brown. 

 Abdomen dark l:)ro^\•nish, with some blackish bands and spots visible on the dorsum 

 iu specimens treated with caustic potash. Wings hyaline; stigma gray; veins grayish 

 brown. Legs mostly pale brownish. Head provided with about 10 long hairs. 

 Front.il tubercles almost as iu the wingless form. Ocelli larger tlian those of the 

 wingless form. Antennae long, ruther stout, inabricated, provided with some very 

 long fine hairs; the 3rd Joint provided with 25-30 circular sensoria of moderate to 

 small size scattered almost over tlie whole length; the 4tl> with about 9-12 similar 

 sensoria over the whule length not arranged iu a single row; tlie 5th witli 3 or 4 

 bcnsoria; the relative leugili of 'oitiis abt)ut as follows: 111-90, I\'-(io, V-55, VI- 

 ICO (30 + 70). Kostrum re.iehing beyond the middle e ixae. Tubercles on the pro- 

 limrax and the abdomen as iu the wiugle^s form. Al)domeu scarcely reticulated, 

 provided with a fw very long hairs ou the dorsum and many on llie vential surface, 

 (.'oruicles as in the wingless form, almost as long as the spur of the last antenn.il 

 joint and almost twice as long as the eauda. C.uula almost as iu the wingless forui 

 iu shape, a litile Iougi:r than tlie base of the last antv'unal Joint, provided with many 

 very long hairs. 



Wings with normal veins; obli<iues ou the liiud wing parallel; Iiooklets 3 or 4. 

 Ijcgs very long, provided wiih uuuiy very long liairs; front tibiae almost as stout as 

 the 3rd autennal .oini; larsi iniliri(M("d; hind t irsi alniost as long as the base of the 

 last autennal Joint. 



Length of body-about 2.2 mm. Antenna about 1.7 mm. 

 Cornicle aliout 0.3 nun. Fore wing about 3.4 mm. 



llost.-rctasitcs tricholuhitn. Tlij lower sides of the leaves are attacked and the 

 iufesi:<i leaves are distinctly curlecb 



Distrlbutiou.-Formosa : Taihoku. 



^lany viviparous females were collected on February 25, 1923, by the author. 



It is possible that the wingless form described above may prove to bo an intcr- 

 medi.itc. 



Aphis malvoides v. d. Goof? 



Aphididae of Formosa, 2, pji. 37 and 103 (1923). 

 Nymph of viviparous female. 

 Key to instars. 



( 1 ) Auteuuac 4.Jointed. The 1st iustar. 



Antennae 5-jointed The 2nd instar. 



