82 E- Takahashi. 



Distribution. — Formosa (Taihoku); Japan (Tokio). 



Hitherto unrecorded from Formosa. 



Many winged viviparous females were colleted in Februarj' lO'il. 



Dilachnus sp. 

 Wingless viviparous female. 



Blackish brown. Head, eyes, prothorax and legs black. 

 Antennae black, with the l^ase of the 3rd joint blackish lirown. 

 Cornicles and cauda black. Body oval, broadest at midlength of the 

 abdomen, with many stout bristles and slightly covered with a powder. 

 Eyes with ocular tubercles, Antennae with many long stout bristles ; 

 the 3rd joint lacking sensoria; the relative length of joints as follows: 

 III— 47, IV— 22, V— 26, VI— 22. 



Rostrum slender, reaching far beyond the hind coxae. Cornicles 

 situated on broad hairy cones. Cauda very short, much wider than 

 long, the posterior margin broadly rounded, with many long hairs. 

 Legs large and very stout, with many very stout long bristles; the 1st 

 joint of tlie hind tarsi equal to half the 2nd. 



Length of body — 3.0 mm. Antenna — 1.4 mm. 



Host. — Pinus sp., attacking the twig. 



Distribution. — Formosa (Taihoku). 



The winged from has never been collected. 



Tuberolachnus vimlnalis (Fansc.) 



Aphis vimlnalis, Fonscolombe, Ann. Soc. Ent. France, x, p. 184 

 (1841). 



Lachmis viminalis, Backton, Monog. Br. Aphid., iii, pp. So-^i? 

 (1880); Theobald, P,ull. Eiit. Research, vi, p, 144 (1915); Matsumura, 

 Jour. Coll. Agr. Sapporo, vii, pt. G, p. 355 (1917). 



Tuberolachnus viminalis, Mordwilko, Ann. iNIus. Zool. Acad. Imp. 

 Des Sc. Tome xiii, p. 374 (1908); Essig, Pom. Coll. Jour. Entom. i\-, 



