Aphiilidae of Formosa. — I. Jo 



III— 32, IV— 12. V— 10; sensoria distributed as follows: III — 17. ..23, 

 IV— 7... 8, V— 5...6. 



Rostrum reaching beyond the h'ont legs. Mesothorax large. 

 The 1st and 2nd obliques of the fore wing united at their bases; the 

 3rd once forked, obsolete at the base; hind wings with 2 divergent 

 obliques; booklets 2 or 3. 



Cornicles absent. Cauda short, much wider than long, with 



some hairs. Anal plate not bilobeih Legs slender, with some short 



hairs; the 1st tarsal joint very short, the 2nd Avith 2 long capitate hairs. 



Length of body — L5 mm. Antenna — 0.65 mm. 



Fore wing — 2.4 mm. Width of fore wing — 1.0 mm. 



Host. — Styrax formosanum. 



Distribution. — Taihoku (Kannon-zan). 



This aphis is distinguished from A. nekoashi Sasaki by the number 

 of the antennal sensoria. 



Tlie aphis produces ver^- large galls on the host plant. 



Tribe Pemphigina. 

 Key to sub tribes. 



(1) Cornicles absent (2) 



Cornicles present (3) 



(2) Antennal sensoria somewhat oval, not very large 



Subtribe Fordini 



Antennal sensoria annular, often very large 



iixxhivihQ Ilela'phidlibi 



(3) Wax glands well developed ^xxhivihe Eriosomatini 



Wax glands not prominently developed ... Subtribe Ponphigini 



Subtribe 3Ielaphidmi 

 Nurudea shiraii Mats. (PL. viii, 2, figs. 6-8). 

 Nurudeopsis shiraii, Matsumura, Essays for Nawa, p. 68 (1917). 

 Nurudea shiraii, Baker, IJull. U, S. Dept. Agr. No. 826, p. 74 

 (1020). 



