FURTHER NOTES ON APHIDES 165 



upper side of the needles, while their ventral surface, covered with 

 white powdery substance, was identical with the silvery grey of the 

 under side of the needles. 



Lachniella pi/ii, Linn. I found apterous viviparous females 

 and a few alat^e common on Scotch fir {Pi/ius sylvesfris), at 

 Swordale, Evanton, in the end of July 191 7. They occurred 

 principally on the younger shoots. I also took this species at 

 Crowborough on 8th July, 



Lachniella pinicola, Kalt = Z. abietis, Walker. Common on 

 spruce - fir {Picea excelsa), occurring on the young shoots at 

 Swordale, Evanton, in July 1917; also taken at Wye, Kent, in the 

 end of June. 



Lachniella piiiihabifans, Mordwilko. This species swarmed on 

 the small twigs of a branch of Scotch fir {Pimis sylvestris) at 

 Rothes, Morayshire, on 28th September 1917. They only occurred 

 on the small, needleless branches, and so closely resembled the grey 

 colour of the bark that at first sight they were difficult to detect. 

 Apterous viviparous females were most abundant, but alatfe were 

 also present. This species seems to be local, as although I searched 

 many other fir-trees in the neighbourhood I could not find another 

 specimen. 



Genus E?/lachfms, Del Guercio. 



Etilachfuis agilis, Kalt. I found apterous and alate viviparous 

 females on the needles of Austrian pine \Pinus lariceo var. Austriaca) 

 at Crowborough and Wye in the beginning of July 191 7. Both 

 green and grey varieties were common at Crowborough. I took 

 this species also on Austrian pine and Scotch fir {Pinus sylvestris) 

 at Swordale, Evanton, in the beginning of August, and at Rothes, 

 Morayshire, in the end of September. 



Subfamily Schizoneurin/E. 



Genus Eriosoma, Samouelle. 



Eriosoma lanigera, Haussman. I noticed that the elm leaves 

 at Stirkoke, Wick, were curled by aphis and took a nymph of this 

 species in the end of September 1918. 



Subfamily Pemphigin^. 



Genus Thecahius, Koch. 



Thecabius affinis, Kalt. On 23rd June I found apterous 

 viviparous females and larvje densely clustered at the base of the 

 stalks of buttercup {Raminculus) at Swordale, Evanton. Alata^ 

 emerged from these on 13th July. 



