•21 IIVOICHI TAKV1IA>-HI: 



sliK'itly ciii'vt'd ; tlui IJrd twica forktHl, cxteiiclinfi; to tlie wiii^ ajx'X ; liiud wings 

 witli 2 ()liIi(HiOT which arc almost parallel; hoaklets 2. Abdumou provided 

 with a few \evy short Inirs. ( oriiicles cvliudrical, raodcr.itely exjianded at the 

 liase, somewhat iiuln-ioMtod, almost as long as the 4th autemaal joiut, a little 

 more tluui twice as long as the caiida. C'anda with 3 paks of moderately long 

 bristles. Legs very loug aud slender, provided with mauy moderately long Sjtae. 



Tx'Ugth of Ixxly — about 1.2 mm. Antenna — about 1.5 mm. 



H jst.- -J/(/(//(a arvoifiis L. var. cuhjin-is Beuth. 



Distriliution. — I'ormosa : Taihoku. Euro^Je. 



Mixuy winged aud wingless viviparoas females were collected by the 

 autlior on October 24, 1922. 



Plitherto luni'corded from Formosa. 



Myzus tropicalis u- sp. 

 (I'l. 11, A. ligs. (•)— 7). 



Wingless \i\iparous female. 



Yellowish gi'ceu or yellow. Es'es black. Antenna^ yellow, apices of the 

 ■'rd, 4th and ."Jtli joints, and the Gth bhxck, Cornicles yellow, apical halves 

 black, ("auda yellow. 



Logs yellow; apices of tibiit) very sligiitly dusk}'; tarsi bku-k. Body 

 provided with a few rather .short, stout bristles which arc; not capifcite. Head 

 provided with .some longer similar bristles. Frontal tubercles modenitely deve- 

 loped, prominently convex on the inner side. Antenna» imbricated, with some 

 sctio ; the 1st joint slightly (;onvex on the inner side, t\w 3rd lacking sc^usjria ; 

 the relative length of joints as follows: 111—53, IV— 30, V— 27, VI— 85 

 (13 + 72). Kostnim reiW^hing the middle cox;ie. Body lacking d >i-sal tubercles. 

 Coniiclcs cylmdrical, long, almost twice jis long as the 4th antonrud joiut, 

 rejichiug the l)a.se of the cauda, imbricated, broadest at the b;use, <! 5 times as 

 long ;is wide, gi-adually tapering, alx)ut 2.8 times t\s long as the cauda. 

 (^auda broadcast at the base, tap<>ring, almist 1.5 time? as loug as wide, with 

 3 ])aii-s of lateral bristk's. I>t>gs pnjvided with m;iny rath.T loug setiX?. 



Length of Ixwly — 2.1 mm. .Vntenua — l.G mm. 



Cornicle — 0.4(3 mm. 



