162 
BEITISH APHIDES. 
black. Front pointed, and tufted witb hair. Eyes brown. 
Thorax and prothorax distinctly divided. Abdomen 
carinated, with transverse rows of setigerous tubercles. 
Last rings hirsute and narrowing to a point, which 
ends with a small yellow tail. Cornicles long, fine, 
and black. Legs thin, ochreous, with black femoral 
and tibial points. 
Very plentiful throughout June, July, and August. 
Winged vimijarous female. 
Indies. Millimetres. 
Expanse of wings 0*320 8*12. 
Size of body 0*100x0*050 2*54x1*27. 
Length of antennge 0*130 3*30. 
,, cornicles 0*030 0*76. 
Head and thorax shining black. Abdomen warm 
chestnut-brown, very shining. Four setigerous tuber- 
cles arranged on each lateral edge. Antennge and 
legs as in the apterous female. Cornicles long, black, 
sometimes curved. Cauda yellow, and one third the 
length of the cornicles. Wings gauzy brown, iri- 
descent, with yellow insertions. Cubitus and stigma 
pale brown. Veins very fine. 
This species is almost omnivorous. Its common 
habitat is the great knapweed, Gentaurea nigra, and 
Sonchus oleraceus. It may also be found on Picris 
Meracioides, Hieracium sylvestre, Creg)is biennis, Lajp- 
Sana communis, Serratula arvensis, Garduus nutans, and 
Ghrysanthemum segetum. 
Mr. Walker mentions thirty plants which form the 
food of S. sonchi. Its omnivorous character doubtless 
has been one cause of its numerous synonyms. 
According to Mr. Walker the male is black, with a 
dark green abdomen and black cornicles. It appears 
in September. 
Kaltenbach thinks, that notwithstanding certain 
discrepancies, S. lactucce of Koch is identical with his 
8. sonchi, and Passerini comes to the same conclusion* 
