Apbididae of FormoEa — I. 7 



Winged viviparous female. 



I >ark red. Head and thorax blackish red. Eyes dark brown. 

 Antciuiae and cornicles black. Abdomen dark red, except the basal 

 halt (it the dorsnm and 'the underside black. 



Wings hyaline, stigma pale yellow, veins yellowish brown. Cauda 

 yellow. Legs pale brown, apical halves of femora, apices of tibiae, 

 and tarsi black. Body provided with some capitate hairs. Frontal 

 tulicrcles large, shorter than tlie 1st antenna! joint. Antennae very 

 long and slendei', with a few capitate hairs; the 3rd joint provided 

 with about SO — !)(J small prominently protruding circular sensoria 

 scattered over the whole length; the 4th joint sparcely imbricated, 

 witliont sensoria; the relative length of joints as follows: III — 154, 

 IV— 41, Y— 40, VI— 108 (];^ + 05). 



Rostrum reaching the middle coxae. Hind wings with 2 jDarallel 

 obliques, booklets 3. Cornicles cj'lindrical, broadest at the base, 

 somewhat tapering, long and slender, not reaching the caudal apex, 

 imbricated, reticulated on the distal two fifths. Cauda large, ensiform, 

 provided with 8 pairs of lateral bristles. Legs very long and slender, 

 with many knobbed setae; the 2nd tarsus long and slender. 



Length of body — 2.2 mm. Antenna — 3.5 mm. 



Fore wing — 3.3 mm. Cornicle — 0.68 mm. 



Hosts. — iSonchus oleraceus ; Lactuca brivirostris ; Lactuca debilis, 

 Lactuca formosana ; Lactuca scariola ; Lactvca gracilis. 



Distribution. — Formosa (Taihoku, Sliirin, Urai, Kiirun, Tansui, 

 Sozan, Kagi, Kwanshirei); Japan (Tokyo). 



Related to 31. compositae Theob., but differs from it in the colour 

 of the Cauda. 



The species is one of the most common aphids in Japan. 



Near Tokyo, the sexual forms make tlieir apperance in November, 

 but in Formosa they do not occur throughout the j^ear. The winged 

 forms are very common at aln^.ost all times in Formosa, as well as, 

 in .lapan. 



