NOTES ON THE APHIDES OF ROSS-SHIRE 83 



Macrosiphuin granarium, Kirby. This species occurred 

 abundantly on some stray oats that were growing in a field of 

 potatoes at Balconie on 7th August. The field had grown an oat 

 crop the previous year. The aphides were feeding both on 

 the blades and the grain, and larvae, nymphse, apterous and alate 

 females were present, pinkish brown and deep green varieties 

 occurring together with intermediate shades. Many specimens 

 of the following species :- 



Macrosiphutn dirkodum, Walker were taken on the same 

 plants at this time, but they were principally confined to the blades. 

 They could easily be distinguished from M. granarium by their 

 cornicles being always paler instead of black, and by their body 

 being of a more elongated shape. Larvx, nymph?e, apterous and 

 alate viviparous females occurred on these oats. I searched the 

 same plants later on the 15th October, but no aphides of either 

 species were then to be found. At this time (15th October) 

 I found alate viviparous females of M. dirhodum on the under- 

 surface of rose leaves in Balconie garden. One of these had 

 been killed by a fungus, Cladosporiinn apkidis, Thiim, for the 

 identification of which I am again indebted to Mr Cotton. 



Macrosiphum allii, nov. sp. 



Aphis allii, Lichtenstein (ined.). 



Alate viviparous female. Head brown ; antenna? dark brown, 

 longer than the body; 3rd segment with nine to ten sensoria 

 arranged in a single row on the outer side along the basal two- 

 thirds, those near the base a little smaller and closer together than 

 the apical ones, which are situated further apart ; 4th segment 

 about two-thirds the length of the 3rd, without sensoria, the 

 apical portion imbricated; 5th shorter than the 4th, imbricated 

 along its entire length, with a single apical sensorium ; 6th segment 

 twice as long as the 5th, with a conspicuous rhinarium surrounded 

 by a group of three to five small sensoria. The sensoria on the 3rd 

 segment have a single contour, that on the 5th segment has a 

 double contour, as has the rhinarium. Each segment of the 

 antennae has a few scattered hairs which are short, thick, and blunt, 

 almost capitate at the extremity. Pronotum olive green, in some 

 specimens tinged with brown, meso- and meta-nota light-reddish 

 chestnut, the thoracic lobes dark brown. Abdomen dull green ; 

 cornicles dark brown, rather short and thick, constricted beyond 

 the middle but widening again at the apex. The basal portion 

 is imbricated, the imbrications extending a little beyond the middle 



