Aphididae ef Formosa. — I. 



51 



Aphis droserae n. sp. (PL. xiv, 1, figs. 7-9). 

 Wingless viviparous female. 



Greenish black. Head, eyes and cornicles black. Antennae 

 black, at the bases paler. Cauda concolourous with the abdomen, with 

 the paler base. Femora blackish brown; tibiae pale brown, with the 

 apices black; tarsi black. 



Body oval, slightly pulverulent, without liairs. Head with a few 

 short Ijristles. Frontal tubercles very short, somewhat convex on the 

 inner side. Antennae in)bricated, with about 4 very short bristles; the 

 3rd joint lacking sensoria; apical sensoria of the 5th joint very small; 

 tlie relative length of joints as follows: III— 22, IV— 14, V— 17, VI 

 -SI (10 + 21). 



Rostrum stout, reaching almost the hind coxae. Prothorax and 

 the 1st alKlominal segment with a small lateral tubercle which is not 

 sharply pointed. Cornicles very short, as long as the cauda, not reacli- 

 ing the cauda, about 4 times as long as wide at midlength, imbricated, 

 broadest at the base and tapering. Cauda wath a distinct constriction 

 about the middle, with 3 pairs of long lateral bristles. Legs slender, 

 with some setae. 



Length of l)ody — 1.0 mm. Antenna — 0.7 mm. 



Winged viviparous female. 



Colour almost similar to the wingless form. Tliorax and antennae 

 lilack. Wings with pale gray stigma and veins. Body lacking a 

 powder. Antennae imbricated, without hairs; the 3rd joint with 6 

 circular sensoria in a row almost over the whole length; the 4th joint 

 locking sensoria; the relative length of joints as follows : III — 18, IV 

 — 12, V— 13, VI— 30 (9 + 21). Rostrum stout, reaching beyond the 

 middle coxae. Wings normal; booklets 2. 



Host. — Drosera lourerii. 



Distrilrition. — Formosa (Sozan) 



This peculiar Aphis somewhat resairibles Aphis bambusae Fullaway, 



