Aphididae of Formosa- — 4. \~ 



Host. — Pmivus persica, Clematis sp. 

 Distribution. — Formosa, Japan, North Ameriea. 



A few apterous viviparous females were ooserved at Sakuraonsen, Formosa, 

 mi Clematis sp. on May 16, H>24. 



Myzus montanus a. sp. 



(PL I. A, fig. (i & PI. 1. B, figs. 6-10). 



Wingless viviparous female 



Green or yellowish green. Head ami thorax dusky mi the dorsum. 

 Antennae Mack, with the base of the 3rd joint pale Abdomen almost dusky 

 on tin- dorsum, with many dusky markings. Cornicles ami Cauda Mack'. 

 Femora black, with the bases pale; apices of tibiae, and tarsi black. Body 

 somewhat elongate oval. Head on the dorsum provided with 8 or 10 very short 

 setae, not smooth on the surface. Eyes rather small. Frontal tubercles distinct, 

 distinctly convex on the inner side. Antennae slender, imbricated, furnished 

 with a few very short setae: the 3rd joint provided with about 20 small circular 

 sensoria not arranged in a single row almost over the whole length : the 4th 

 usually without sensoria. but sometimes provided with 1 or 2 small ones near 

 the base; the 5th with the primary sensorium rather small: the relative length 

 of joints about as follows : IIL-lOO, [V-58, V-45, VI-112 (24 + 88). Rostrum 

 reaehiii"' the hind coxae. Abdomen on the dorsum provided with a few very 

 short setae, with man) spinule-rows on the posterior portion. Cornicles long. 

 slender, a little dilated on the distal half, very slightly expanded toward the 

 base on the basal portion, indistinctly imbricated, not reticulated, almost as long 

 as the 3rd antennal joint, a little stouter than the hind tibia, about 2..~> or 3 

 times as long as the Cauda. Cauda large, very stout, with 2 pairs of lateral 

 bristles. Legs verv long and slender: tibiae almost as stout as or more so than 

 the 3rd antennal joint, furnished with many moderately or rather long setae: 

 hind tarsi almost as long as the basal part of the last antennal joint. 



Lenath of bodv — about 1.9 mm. Antenna — about '2.0 nun. 



Cornicle — about 0.55 nun. 



Winged viviparous female 



Colour almost as in the apterous form. Fore wings somewhat clouded 

 along the lit and 2nd obliques. Abdomen with rome du-k\ markings on the 



