Aphididae of Formosa. — 3. 83 



small and circular as iu most species of Oregmaj the 4th very slightly imbricated, 

 almost as long as the basal two joints taken together; the relative length of joints 



about as follows: III-20. IV-19 20. Eostrum [very stout, almost reaching the 



middle coxae. Abdomen provided with a few rather long bristles on the dorsum. 

 Cornicles very short, somewhat protruding. Cauda much wider than long, wider 

 than tlie lobe of the anal plate, constricted at the base, M'ith some very long bristles. 

 Anal plate bilobed, each lobe being provided with about 5 very long bristles. Tibiae 

 rather long, stouter than the antenna, furnished with some long bristles; tarsi 

 scarcely imbricated, hind tarsi longer than the 3rd antennal joint. Wax- pores 

 well- developed, very large, larger than the opening of the cornicle in di.imeter, 

 circular, subcircular or oval, distributed as follows: 



(a) On the side of the body: head-0, prothorax-4 7 in each group, meso- 



thorax-5 6, mctatliorax-5 7, the 1st abdoninal segment-4, tlie 2nd, 3rd, 4th 



and 5th each-5 6, the 6th-6 8, the 7th-7 8. 



(b) On the dorsum: head-5 9 in each group, protliorax-3 6, meso- 



thorax-6 8, metathorax-3 5, the 1st abdominal segment! 3, tlie 2nd-l 3, 



the 3rd-0 3, the 4th 1 2, the 5th-2, the 6th and 7th-0; the Sth-about 10-12 in 



a group at the middle. Wax-pores ou the head somewhat smaller than those on 

 the remaider of the body. 



Length of body-about 1.5 mm. 



Winged viviparous female. 

 Head, eye.'', antennae, thorax and legs black. Abdomen dark purplish. 

 Head provided witli many very short hairs ou the dorsal as well as on the ventral 

 surface. Horns almost entirely lacking. Eyes very large, with the ocular tuber- 

 cles small. Antennae striate, 5-jointed, without hairs; sensoria annular, almost 



entirely encircling the segment, distributed as follows: in-22 24, IV-10 12, 



V-8 '.9; the relative length of joints about as follows: in-75, IV-35, V-35. 



Rostruiu' stout, not reaching the middle coxae. The 1st and 2nd obliques on the 

 front wing united at their bases; the 3rd once-forked, obsolete at the base; subcosta 

 provided with about 7 small sensoria; hind wings with 2 obliques that are not 

 parallel; booklets 2. Abdomen furnished with some rather long bristles. Leg3 

 ■ slender; tibiae more slender tlian the antenna, provided with many moderate or 

 ratlier long bristles; tarsi slightly imbricated, iiind tarsi shorter than the 4tli anten- 

 nal joint. 



Jjcngth of Iwdy-about 1.3 mm. Auteunn-about 0,7 mm. 



Fore wing-about 2.7 mm. 



