t-a E. Takabaslii. 



Eyes situated 011 the margin of the bead, protuberant, composed of 3 facets. 

 Antennae very short, shorter than the bristle on the body, 3-jointed. Rostrum 

 reaching the middle coxae. Legs very short. Genital plate rather large, provided 

 with about 15 long stout bristles arranged in a row on the posterior margin, 

 these bristles much shorter than those on the body. Cauda constricted at the 

 base, furnished with some long bristles. Anal plate bilobed, with some similar 

 bristles. In specimens treated with caustic potash, numerous small wax-pores ? 

 visible which are not transparent, rather irregular in shape and scattered over 

 the dorsum. 



Length of body — about 1.4 mm. 



Host. — Quercus glauca, attacking the branch. 



Distribution. — Formosa: Baikei near Musha in Taichu-prefecture ; Shirin. 



Hitherto unrecorded from Formosa. 



Many apterous forms firmly cemented to the host were collected by the 

 author on May 21, 1924. They were covered with tents by ants. This species 

 closely resembles Astegopteryx hongkongensis v. d. Goot and A. arboris v. d. 

 Goot. No winged forms have ever been collected. 



Formosaphis n. g. 



(Winged form) Body provided with a few bristles which are not capitate, 

 without dorsal tubercles. Head divided, without wax-plates. Frontal tubercles 

 absent. Eyes with small ocular tubercles. Antennae short, stout, 5-jointed, 

 almost without hairs, a very large sensory area which is reticulated present on 

 each of the 3rd, 4th and 5th joints, spur of the last joint very small. Fore 

 wings with the 3rd oblique simple, stigma not elongate; hind wings with 2 

 obliques. Abdomen with wax-plates. Cornicles absent. Cauda not distinct. 

 Anal plate rounded. Tarsi normal. 



(Wingless form) Head small. Eyes of 3 facets. Antennae 4 or 5-jointed, 

 without secondary sensoria ; primary sensoria circular, small. The 7th abdominal 

 segment with a small blunt tubercle on the side. Other characters almost as in 

 the winged form. 



Type — Formosaphis miclieliae a. sp. 



This genus is peculiar in the nature of the autennal sensoria of the winged 

 form, and will fall in Melaphidini. 



