96 
BRITISH APHIDES. 
extend to tlie dotted line. A current rises on one side 
of the leg and returns by the other. 
Fig. 13. — Tarsus of Aphis pruni. 
Fig. 14.— Tarsus of Fhorodon gcdeopsidis. d, articu- 
lating plate ; m, connecting membrane ; p, pulvillus ; 
Its claws. N.B.— Figs. 4, 12, and 14 have been 
treated with dilute chromic acid, and viewed by a 
-^Q immersion lens. 
Fig. 15. — Cornicle or nectary of Myzus persica^s 
containing, h^ several oil-like globules (the air-bubbles 
of Morren). This substance, when shed, constitutes 
the honeydew,” 
Figs. 16 and 17.— Cornicles of Siphonophora circum- 
flexa. The first fig, shows the fine tube which traverses 
the centres. The latter contains, several oil-globules 
which have become semi-crystalline ; o o o, the mouths 
of the cornicles, apparently closed by a membrane. 
