110 
March 
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Proceedings of the Royal Society of Edinburgh. [Sess. 
On Ribes On Labiams. 
Egg 
o 
Fundatjrix, 0 
x generations, O ■?'? 
1 
x generations, q -5'? 
x generations, o -55 
Migrant, 
x generations, O -55- 
x generations, o 
x generations, o -St 
x generations, o -S'c 
Diagram of the life-cycle of Myzus ribis , Linn. , from observations on the A. I line 
in the Laboratory. 
O = apterous form. — alate form. 
