138 BRITISH APHIDES. 



Winged viviparous female. 



Colour dirty greenisli yellow (sclimutzig gelhrotlilicli 

 of Kalt.). Head brownish. Eyes large and red. 

 Antennae green, with brown tips, and rather pilose. 

 Seventh joint variable in length, but usually shorter 

 than that seen in the larvce. Thoracic lobes and scu- 

 tellum dark brown. Abdomen arched and shining, 

 rather pilose. (Kaltenbach and Koch describe it with 

 numerous black bands.) Cornicles yellow, cylindrical, 

 with a lengfth of twice the breadth. Cauda incon- 

 spicuous and brownish-yellow. Legs yellow and 

 rather short. Wings rounded, iridescent ; cubitus and 

 other veins brown ; stigma greenish. 



Kaltenbach remarks upon the inconstant length of 

 the seventh antennal joint and also notices the vari- 

 ability of colour. At first he seems to have thought 

 that this insect might prove a variety of Aphis salicis 

 of Linn., but the capture of other specimens proved 

 the great difference between this somewhat dingy 

 Aphis, and the fine black willow Aphis, which is 

 spotted with white, and is conspicuous from its vasiform 

 orange nectaries. 



Koch formed a new genus, Cladobius, for this insect. 

 The characters he gives, illustrated only by this sole 

 species, do not seem to me to be sufficiently marked 

 to necessitate a separation from Chaitophorus, to 

 which genus I think pojmleus belongs. Koch grouped 

 it with the lime Aphis under the head Phyllaphiden. 

 Passerini retains Cladobius, and describes under this 

 genus an Italian species, CI. lantance, which possesses 

 long nectaries. 



Walker says that C/. populeus sometimes occurs in 



