go THE SCOTTISH NATURALIST 



the sides. The dorsum of the posterior segments of the 

 abdomen (preceding the cornicles) is occasionally suffused 

 with dark brown. Cornicles and cauda similar in structure 

 to those of alate female. 



Length 22 mm. 



Nymph. — Pale pinkish purple dusted with tomentum 

 and with a large tuft of flaky white tomentum at apex of 

 abdomen. Antenna; and legs dingy greyish ochreous. 

 Wing pads brown. Cornicles black. 



Larvce. — Pale ochreous, pale pinkish yellow, or pale 

 pinkish purple. Antennse, legs, and cornicles coloured as 

 in the nymphae. 



Genus AniLvapJiis, Del Guercio. 

 AniirapJiis centaiiriella^ Theobald. — Alate viviparous 

 females, larvae and nymphae, occurred on Knapweed {Cen- 

 taurea nigra), near the flowering heads, amongst colonies 

 of Macrosiphuin Jacece, Linn., at Inveran, Livershin, on 

 7th September. Apterous viviparous females were also 

 found but were less common. 



Genus Toxoptcra, Koch. 

 Toxoptera graniinuni, Rond. — An alate male, a nymph, 

 and a few oviparous females occurred upon grass, growing 

 in a meadow at Inveran, Invershin, on 23rd September. 

 Mr Theobald has taken alate and apterous viviparous females 

 of this species upon grass at Chilham, Kent, in June 1920, 

 otherwise, as far as I am aware, no records exist of the 

 occurrence of this well-known American corn pest in Britain. 



Subtribe MacrosipJiina. 

 Genus Macrosiphuin, Passerini. 



MacrosipJuun jacecB, Linn. — Sexuales of this species were 

 very common on the flowering stalks of Knapweed {Centaiirea 

 nigra) at Inveran, Invershin, in the beginning of September. 



Macrosiphuni urticce, Schrank. — Apterous viviparous 

 females and young were abundant upon the leaves of nettle 

 at Invershin in the beginning of September. No oviparous 

 females were found, but a few nymphae and alate males 

 were taken. The male is here described for the first time. 



