134 BRITISH APHIDES. 



Chaitophorus salicivorus, Walher. Plate LXXX, 

 figs. 1 — 4. 



Aphis salicivora, Walker. 

 Chaitophorus salicivora, Pass. 



Inch, Millimetres. 



Size of body 0-040 X 0'017 I'Ol X 0-42. 



Length of antennoe 0*015 0*38. 



Very small, green, covered witli fine long bristles. 

 Eyes brown. Prothorax large. Abdomen oval, not 

 tuberculate, or else tbe tubercles are rudimentary. 

 Faint spots ranged in longitudinal rows. Cornicles 

 green, small. Cauda obtuse. Legs stout and short. 

 Tibial tips and tarsi dark olive. This insect greatly 

 varies in colour. Some are luteous, with greenish 

 stains, others are ferruginous red. The rostrum 

 reaches to the third coxge. 



TJie apterous male. 



This may be distinguished by its black head, dark 

 legs, and longer antennce, and also by a series of 

 black transverse bands, which are connected by a 

 black longitudinal dorsal stripe. Black dots mark the 

 dorsal pores. All the bristles are bifurcate at their 

 tips. The anus well shows on each side one of the 

 two compressing valves ("armature copulatrice" of 

 Balbiani), which cause the exsertion and support of the 

 curved penis. 



Inch. Millimetres. 



Size of body 0-040 X 0-020 1-01x0-508. 



Length of antennse 0-030 0-760. 



Apterous oviptarous female. 



This does not greatly differ in colour from the vivi- 

 parous female, but it is rather more oval in form, and 

 the dorsum often is stained with ferruginous red, with 



