Aphididae of Formosa — 4. 13 



divergent obliques; booklets 4. Cornicles cylindrical, long, somewhat expanded 

 toward the base <>n the basal half, somewhat cnaved, imbricated, aot reticulated, 

 almost as long as the 3rd antenna] joint, about twice or more times as long as 

 the cauda. Cauda more slender than that of the apterous form,, provided with 

 I pairs ot long lateral bristles. Legs slender; tibiae almost as slender as or 

 slightly stouter than the 3rd antenna] joint, provided with many rather long 

 setae; hind tarsi somewhat shorter than the basal part of the last antenna! joint. 

 Abdomen with a few very short setae on the dorsum. 



Length of body — about 2.0 rum. Antenna — about 2.0 mm. 



Cornicle — about 0.5 mm. Fore wing — about 3.1 mm. 



Host. — Rhododendron lasiostylwn. 



Distribution. — Formosa: Tattaka (altitude about 7300 feet) in Taichu- 

 prefecture. 



Some specimens wer< ilected by the author on May 17. 1924. This species 



is dedicated to the memory ot' the late ~S\r<. X. Ito. 



Myzus sp. 



(PI. 1, A. rigs. 7-9) 

 Wingless viviparous female 

 Dark green. Cornicles and cauda black. The 5th and 6th antenna) joints. 

 femora excepting the bases, apices of tibiae, and tarsi black. Body oval, without 

 prominent hairs. Head on the dorsum furnished with 8 very short setae. 

 Frontal tubercles short, distinctly gibbous on the inner side. Eyes rather large. 

 Antennae imbricated, provided with a few very small hairs: the 1st joint larger 

 than the 2nd: the 3rd and 4th sometimes not well defined, without sensoria; 

 the oth with the sensoriuni ot' medium size: the relative length of joints about 

 as follows: 111-49. IV-40, V-26, VI-80 (15 + 65). Rostrum reaching a little 

 beyond the middle coxae. Abdomen provided with a few very short setae 

 arranged in a transverse row on the dorsum of the segment. Cornicle-' rather 

 large, long, cylindrical, somewhat expanded toward the base, not dilated at the 

 has.', straight, roughly imbricated, not reticulated, almost as Ion-- as the distal 

 part of the last antenna] joint, a little more than twice as long as the cauda. 

 Cauda large, very stout, tapering, much longer than wide, with 2 pairs. of long 

 lateral bristles. Legs rather stout; tibiae stouter than the 3rd antenna! joint. 

 but more slander than the cornicle, provided with many moderately long setae; 



