Aphididae of Formosa. — 3. g^ 



Cauda not distinct. Anal plate not bilobed. Logs rather large, provided witli 

 some long bristles; hind tibiae longer than the antenna; tarsi slightly imbricated, 

 l>rovided with 4 extremely long slightly knobbed hairs; hind tarsi almost as long as 

 the 4tli antennal joint. 



Length of body about 0.65 mm. 



(The second instar) Diilera from the 1st instar in the following points: 



(1) The 3rd antennal joint longer than the 4th. 



(2) Horns on the head rounded at the ajiex. 



(3) Hind tarsi shorter than the 3rd antennal joint. 



(4) Cornicles present, situated on cones which are provided witii hairs. 

 Tlie relative length of antennal joints about as follows: III-30, IV-24. 

 (The third instar) Differs from the 4th instar in the following characters: 



(1) The 3rd antennal joint almost as long as the 5th. . 



(2) Wing-pads not well developed; meso-and metathoraccs somewhat 

 jirotruding on the sides. : . ' . . ^ 



(3) Eyes composed of ,3 facets; eyes of the adult not visible, 



(4) Body shorter, measuring about 1.6 mm. in length. 



The relative length of antennal joints about as follows: 10-30, IV-15, V-28. 



(The fourth instar) Yellowish green to almost yellow, with a pair of longi- 

 tudinal green patclies on the dorsum, which are interrupted at midlength. Anten- ' 

 nae ]iale greenish. Eyes brownish. Wing-pads pale yellow. Legs pale green, 

 ('ornicles and eauda conoolonrous with tlie body. Head without wax pores, fused 

 with tlie pronotum, tlie dorsal surface with a few long bristles wliich are shorter 

 than the horns. Frontal tubercles lacking as in other instars. Eyes not protrnd- - 

 iug, with the ocular tubercles very small. Horns long, much more slender than 

 tlie antenna, very slightly expanded toward the base, almost as long as the basal 

 two antennal joints taken together, the apex rounded. i 



Antennae very stout, stouter tiian the tibia, 5-jointed, with a few rather long 

 bristles; the 4th joint almost as long as the basal two joints taken together, with. the ' 

 sensorium circular and very small; the 5th slightly imbricated on the apical ' 

 portion; the relative leugtli of joints about as follows; III-50, IV-25, V-30. 

 Rostrum short, reaching beyond the front coxae. Thorax without wax -pores, meso- 

 thorax large, with the wing-pads well-developed. Abdomen with a few long bris- 

 tles, the 2nd, 3rd, 4th, Uh, 6tli, 7tli, anil 8th segments eacli provided with 5-7 

 small wax-pores, which are circular or oval, arranged in a row on either side. 



