NOTES ON THE APHIDES OF ROSS-SHIRE 81 



NOTES ON THE APHIDES OF ROSS-SHIRE, WITH 

 DESCRIPTIONS OF TWO SPECIES NEW TO 

 SCIENCE. 



By Dorothy J. Jackson, F.E.S. 



As little appears to be known of the distribution of the 

 Aphididae in the north of Scotland, I collected such as 

 I could find in Rcss-shire from July to October 1917. Mr 

 F. V. Theobald has helped me to name them, and I am able 

 to record the species in the following notes. All the species 

 I collected were taken in the vicinity of the Cromarty Firth, 

 and principally within a three-mile radius of the village 

 of Evanton. Within this radius my observations were 

 chiefly confined to two gardens, first, that of our home, 

 Swordale, which stands over 500 feet above sea-level ; and 

 secondly, to that of Balconie Castle, which is situated close to 

 the sea and is very sheltered. Miss Bankes rendered me 

 great assistance by collecting many of the specimens recorded 

 from this garden. 



Family APHIDID^. 



Subfamily Aphidin^e. 

 Genus Macrosiphum, Passerini. 



Macrosiphum rosce, Linn. This species was abundant at 

 Swordale and Balconie in the end of July and in August. It 

 was particularly troublesome to the young shoots of rambler roses, 

 upon which apterous viviparous females, larva?, and, in lesser 

 number, alate viviparous females were thickly clustered. Fortunately 

 this species is much preyed upon by salmon-pink Cecidomyid 

 larvae, which, once they appear upon the scene, soon clear the bulk 

 of the aphides off. 1 Cecidomyid larvae feeding on many kinds 

 of aphides are very common in Ross-shire, and must play a most 

 important part in keeping the aphides in check. 



On 15th October I took an alate viviparous female of Macro- 



1 The occurrence of Cecidomyid larvae preying upon aphides in America 

 is recorded by John J. Davis in Journal of Agricultural Research, vol. vL, No. 23, 

 Department of Agriculture, Washington, D.C., 4th September 1916, under the 

 heading, " Aphidoletes meridionalis, an Important Dipterous Enemy of Aphides." 

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