Aphididae of Formasa.— 3. S6 



than the antenna, with some long hairs, front tibiae almost as long as, or sliglitly 

 longer (/han, the antenna; ta*si not imbricated a little longer thai* the 3rd antennal 

 joint. Well-develtiped wax-pofes that are not very large, circular or suljcircnlar 

 in shape, distributed as in Oregma inontcaia v. d. Goot, the number in each glSjUp 

 about as follows : 



(a) Dorsal wax-pores: liead 0, prothorax-3 li^, mesothorax-9 11, meta- 



thorax-3"-'-5, the 1st abdominal srgmont-1 3, the 2nd and' 3rd-2- 4, the 4th-i 



5, tlie 5th 2, the 6th-0 1, the 7th-0; the Sth-? 7 in a group at the 



uiiddle. S 



(ib) Lateral wax-pores: head 0, prothorax 2, mesothorax-0 2, meta- 



thorax-o 3, the 1st abdominal segment! 3, the 2nd-2 (J, bha 3rd-2 6, the 



4th-4 8, the 5th-2 7, the 6th-4 9, the 7th-2 4. 



In specimens trea'.ed with caustic pofeish, (he head appears bittwnish ai^ 

 many brownish patches are visible on the dorsum of the body, while numerous very 

 small poorly-developed wax-pores which are r-ather irregular in shape, are scrtteretl 

 over the dorsum as in Oregma hambusicola Takah. 

 Length of body-about 1.84 mm. 



WoHt.-Bamhusa sp., attacking the shoot. 



Distribution.-Formosa: Kusukusu, Koshun. 



Many viviparous females grouping densely on the shoots were observed on 

 November 24, 11)23, at Kusukiisu, when no wingod forms were discovered. This 

 aphis dift'crs from the original descri])tion of Orr'/ma vtontaiwi v. d. Goot in the follow- 

 ing characters: (1) Never yellowish. (2), Horns on the head longer. (.3) 

 Abdomen provided with some hairs. 



This new Oregma is also very closely allied to (h pneudomontama n. sp., ditter- 

 ing from it, however, in the following characters: (l);Body not depressed. (2) 

 Horns on tlie head largisr. (3) Head without well-developed wax-pores. (4) 

 Wax-pores on the body smaller. (5) Wax-pores on the thorax much smaller than 

 those on the doraum of the abdomen. In 0. pseutlvmonkina n. sp., these arc equal 

 in sine. (6) Wax-])orcs on the Sth abdominal segment usually fe\\'er iu number. 

 ( 7 ) Legs stouter, 



Oregma bambusifoliae Takah. 

 (PI. VIIT, A, figs. 2-8) 



Ai^liididae of Formosa-!, p. 87 (1921) and Aphididae of Formosa-2, p. 143 

 (1923). 



