82 Aphididae of Formosa.— 3. 



segment furnished with from 1-4 well-developed circular wax-pores arranged in a 

 group on the dark brownish patch on the sides, the 7th with from 4-6 larger ones on 

 the sides, the 8th witii about 9 or 10 very largo circular or subcircalar wax-pores in 

 a group at the middle of the dorsum. Head, thorax and basal alxlominal segments 

 without well- developed wax-pores. Numerous very small, poorly developed wax- 

 poresare recognizable, these subcircuhir or iri'cgular in shape, not transparent, and 

 scattered over the dark brownish patches on tlie dorsum. These poorly developed 

 ■wax-pores are also visible in 0. Jiamhusicoln Takali. Tlic wax-pores scattered over 

 the dorsum of Aleiirodaphis diSbr from those of these species of Orccjma in tiie 

 larger size, circular shape and in being transparent. 



Length of body-about 4.0 mm. Antenna-about 0.65 mm. 

 Hind tibia-about 1.75 mm. 



'H.osi.-Dendrocalamus latifloj-us, attacking the young shoot. 

 Distribntion.-Formosa. 

 . ■ The wingless viviparous females were observed in great abundance on Decem- 

 ber 2,1923. This aphis is named in honour of Prof. Dr. C. P. Alexander of 

 the Massacliusetts Agricultural College, United States of America, to whom the 

 author acknowledges indebtness for many favours. This new species is very closely 

 related to Orcgnia hamhimcoJa Takah., differing froni it, however, in the following 

 characters : 



(1) Body more elongate. (2) Rostrum sliorter, not reaching tlie middle coxae. 

 (3) Legs much longer. (4) Cornicles larger in diameter, ("j) Tlie 6th, 7th and 8th 

 abdominal segments provided witii well-developed wax-pores. (6) Body with more 

 dark brownisli patclies, wliicli become apparent in specimens treated witii canstic 

 potash. 



Oregma pseudomontana n. sp. 

 (PI. VI, B, figs. 14 & PI. VII, A, fig. 1 ) 

 Orccjma montana, Takahaslii, Aphididae of Formosa-2, p. 52 (1923). 



Wingless viviparous female. 

 Dark purplish, very slightly dusted with powder. Body broad, rather 

 depressed. Head fused wish the prothorax, provided with some rather long hairs. 

 Horns almost as long as the 1st antennal joint, rather pointed at the apex, broadest 

 at the base, tapering, about twice as long as wide at midlength. Eyes composed of 

 3 facets. Antennae very short, 4-jointed, provided with a few rather long hairs; 

 the 3rd joint somewhat expanded towards the apex, witli the apical sensorium very 



