Aphididae of Formosa. — I. 81 



(1 ) Head divided. 



(2) Eyes of the wingless female large, not rudimentary; ocular 

 tubercles always absent. 



(3) Males winged. 



No species of Nlppolachnus, the type-genus of this subtribe, occurs 

 in Formosa. 



Subtribe Lachnini. 



(1 ) Stigmatic vein short and straight. (2) 



Stigmatic vein of moderate length and curved. 



Tuber olachnini Mordw. 



(2) The 3rd oblique twice branched. Dilnchnus^eker. 



The 3rd oblique not twice branched Lachnns ^iXtva. 



Lachnus thujafoUae (Theobald.) (PL. X, 2, figs. 1-4). 



Lachniella thujafoliae, Theob. Bull. P]nt. Research, iv, pp. 335-336 

 (1914). 



Host- — Thuja orientalh. 



Distribution — Formosa (Taihoku); Ja])an (Tokj^)); 



Africa (Theobald). 

 Hitherto unrecorded from Formosa. 



Ke}^ to Formosan species of D'dachnus. 

 (1) The 4th antennal joint of the wingless viviparous female with 1 



sensoria /?. joinit^ewsi^orae (Essig et Kuw.) 



The 4th antennal joint of the wingless viviparous female without 

 sensoria D. sp. 



Dllachnus pinidensijlorae (Essig et Kuw.) 

 Lachnus p'midensijlorae, Essig and Kuwana, Proc Calif. Acad- Sc 

 viii, No. 3, p. 99 (1918). 

 Host. — Pimis sp. 



