124 BRITISH APHIDES. 



I find also winged insects, botli male and female (the 

 last is Koch's fig. 20). The male is very like the winged 

 one in form and colour, but the terminal antennal 

 joint is ^ longer in the winged male. This un- 

 winged generation seems to be produced by the former 

 winged one ; and here we have the extraordinary fact 

 of two sexuated generations, one after the other, the 

 first one winged, the second not so. The first gives 

 birth to living young. I cannot yet perceive what the 

 apterous females produce, but I very much think that 

 it can only be the black shining eggs." 



In this surmise M. Lichtenstein was correct. 



Aider ous male. 



Incli. Millimetres. 



Size of body 0*080 X 0-030 2-02 X 0-76. 



Long oval, attenuated posteriorly. Head broad, 

 colour buff -yellow, with broad rich brown patches on 

 the head and thorax. Abdomen broadest in the 

 middle, with six or more interrrupted dorsal bars and 

 numerous spots and blotchings on the sides. Cornicles 

 inconspicuous. Antennse about the length of the 

 body, brown at the articulations. Eyes red. Legs 

 yelfew , with a longitudinal forked band on the femora. 

 Dissection unmistakably showed the sex of this insect. 



Feeding on the maple in November at Montpellier. 

 Passerini mentions the apterous male of this species, 

 but it does not appear from actual observation of the 

 same. 



Winged male. 



In general marking this much resembles the 

 apterous variety. It has been before described by 

 Walker. It occurs dark green, with transverse rows 

 of black dorsal spots, and ornamented with a row of 

 dots on each side. Some varieties become dark brown, 

 or even black. I have been able also to verify the sex of 

 this insect from the microscopic preparations sent from 



