Aphididae of Formosa. — I. 31 



Described from specimens preserved in alcohol. 

 Wingless viviparous female. 



Yellow. Antennae, cornicles, Cauda and legs concolourous with 

 the body. Eyes dark red. Body elongated and somewhat flattened, 

 without prominent hairs. Head large and flat, peculiar in shape, the 

 top forming a ledge wliich extends out over the antennae; a very 

 small blunt tubercle present in front of the eyes. Antennae very 

 short, without hairs, arising from the underside of the head, 5-jointed; 

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

 in-2], IV-7, V-20 (9+11). Eyes small; ocular tubercles distinct, 

 but very small. Rostrum short, not reaching the middle coxae. Head 

 and prothorax very distinctly defined. Prothorax nearly as long as 

 the head, without lateral tubercles. Abdomen broadest at midlength, 

 without tul)ercles. Cornicles projecting horizontal!}' behind, reaching 

 the caudal apex. Cauda triangular, when seen from above, slightly 

 curved upwards and furnished with a few i-ather short hairs. Anal 

 plate large, reaching the caudal apex, semicircular, the posterior 

 margin rounded. Legs short, witli a few setae. 



Length of body — LTmm. Antenna — 0.5 mm. 



Winged viviparou'^ female. 



Antennae, cornicles, cauda and legs yellowish brown. Head 

 dark brown. Mesothorax black; abdomen yellowish brown. Wings 

 hyaline, stigma and veins pale yellow. 



Body elongate, without hairs. Eyes large, with prominent 

 ocular tubercles. Frontal tubercles very short. 



Antennae without hairs; arising from the underside of the head; 

 the 1st joint much larger than the 2nd; the 3rd with 35, the 4th 15, 

 the 5th 6 large sensoria on the whole length; secondary sensoria 

 shghtly narrowed transversely; the relative length of joints as follows: 

 III-47, IV-25, V-23, VI-52 (19 + 33). Rostrum not reaching the 

 middle coxae. Body without lateral tubercles. Obliques on the hind 



