In.'^ects, etc., Injuriou.^ to Niit^. 



:uz 



When very abutidaiit on tlie sweet chestnut tlie Ixixes should he 

 eolleeted and burnt, it on youn,!:; trees. 

 On old ones it does 1)at little liariii. 



REFKr.UXl'ES. 



Ill Vislirr-Scldirli. • ilanuiil of Fuix'stvy." \-oL \., p. 10;-! (ISO;")). 

 el] Thrnh.ihl. F. ]-. Animal Pests of Forest Trees. .Toui'iial K. ]•:. A-ri. ColL, 

 Xo. i;-;, p. IS,') (1904), 



111.— TO WALXUT, 



THE DUSKY-VEINED WALNUT LOUSE. 



( I'liji-hodis jiii/hi iidi^. Fris(di,j 



This is one of our most beautiful aphides, and it is sti'aii^e tliat 

 such a conspicuous insect's life-liistory sliould remain still uiikuown. 

 It is well floured lyv Piucklon ( I ). 

 I oliserved it for nine or ten 

 years regularly {'!) ^^•orkil|o■ 

 upon souie large Avalnut trees 

 at Kingston - on - Tliames ; liut, 

 although present in jileiity, it 

 ne\'er increased .sufficiently to 

 do any serious harm to the trees 

 until 1894, when this and otlier 

 ]:)ests were most destructi\'e. 

 The earliest note of the creature's 

 ai>pearauce upon the walnut leaf 

 was the 1st of July; in 1SII4 

 none were ofjserved until tlie 

 10th of July, In all instances 

 the form of aphis first oliserved 

 upon the leaves was the irliii/n/ 

 viviparous female. The folhiw- 

 iug is cop)ied direct from my 

 notes : — " These plant lice are 

 always to lie found on the njijirr 

 surface of the walnut lea\-es, 

 and in two rows close to the mid 



rib (Fig, 212), The winged fenuxles usually settle and fix themselves, 

 liefore reproducing, in patches of fourteen to twenty, seven or ten 

 on each side of the mid rib, wUh then- heads invarialily pointing 



I /■■. i-:<ir 



Ii:. 112.— THY. IiUSKY-M'.I.NKI' WAI..\rT (.^ilsl 



Nymiihs lai luaf iiiid just hatrln-.l iuliilt "ii 



left of njiiipli.<. (Enliiri^i'iLi 



