98 BRITISH APHIDES. 



Apterous Queen Aphis. 



Incli. Millimetres, 



Size of body 0-095 X 0-045 2-41xl'13. 



Length of antennae 0-012 0-30. 



„ cornicles rudiraentaiy. 



Broader and larger than her offspring, even when 

 they are adult. Covered with a cotton-like fibre. 

 When denuded, flat-oval, sometimes almost circular. 

 Dorsum domed and ringed. Colour variable with age, 

 from pale green to dark olive ; mottled. Four series of 

 longitudinally-arranged pores occur down the back, 

 each of which gives rise to the cotton-like fibres under 

 which the insect conceals itself. Head and thorax 

 very small and black. Antennas and legs very short, 

 and black also. The latter when contracted under the 

 body quite hidden, as in Coccus. Rostrum very short, 

 reaching only to the second coxse. Antennae degraded 

 in type, and usually restricted to at most five joints. 

 In later generations these organs regain their full 

 development. 



The leaves of Uhnus suherosa are attacked by this 

 insect immediately after she leaves the egg. She 

 commences her punctures under the leaf almost 

 directly it unfolds from the bud, and she causes it to 

 blister into numerous cavities, within which she 

 nestles. Shortly afterwards the leaf curls from above 

 downwards into a roll of a sickly yellow colour. 

 Within this roll a large number of young are born. 

 They are of a lengthened form, and of a lively green. 

 After several months they develop wing-cases and 

 become pupgo, from which the images of the first series 

 (" Pujnferes emigrantes,^^ Licht.) emerge in turn, and 

 take wing for the purpose of dropping their progeny 

 on other trees and branches. 



These young are born in the form of yellow ova, 

 and might be almost mistaken for such, except from 

 the existence of two black eyes which are sufficiently 

 perceptible. The casting of a delicate membrane 



