AFRICAN APHIDIDAE^PART IT. 



129 



Myzus tetrahodus, Walker. 



Siphonophora rosarum, Koch {nee Kalt. and Walk.). 



Walker, Ann. Mag. Nat. Hist., (2) iii, p. 302 (1849) ; Koch, Die Pflanz., p. 180, 

 pi. xxxiii, figs. 247-248 (1857). 



Egypt : Gizeh, Cairo, on roses {F. C. Willcocks). 



This rose aphid is easily recognised by the capitate hairs on the head and body, 

 and by its black cornicles . Buckton's Siphonophora rosarum is not the same as Koch's, 

 nor is it Kaltenbach's, nor Walker's, which are the same. Walker's Aphis tetrahodus 

 has black cornicles in the alate female just as Koch describes and figures for his 

 rosarum, and I am sure they are the same {vide table of Rose Aphides, p. 112). 



Myzus asclepiadis, Pass. (figs. 21, 22). 



Aphis nigripes, Theobald. 



Passerini, Aphid. Ital., pp. 22 and 25 (1863) ; Theobald, Bull. Ent. Res. iv, 

 p. 327, fig. 10 (1914). 



Uganda: Kitoma, 6.xi.l3 (C. C. Gowdey). Transvaal: Onderstepoort, 

 21 .iv. 14 {G. Bedford) ; Pretoria, 1 . viii. 13 {G. Bedford). Italy {Passerini), 



Pig. 21. Head, •'cornicle and cauda oft A~C, Myzus 

 nerii ; D-F, 31. asclepiadis , G-I, M. asclepiadis Var. 



nigripes. 



Food-plants. — Asclepias lunata, GomphocarpusfruticosicssindSalixs]^. 



Schouteden and others have placed A, asclepiadis, Pass., as a synonym 

 of A. {Myzus) nerii, Boyer. As the Salix aphid sent me by Mr. G. Bedford 

 from Pretoria did not agree with A. nerii I described it as a new species. 

 Since then I have had a similar aphid from Asclepias lunata and Gomphocarpus 

 fruticosus and find that they agree with the Salix species so closely that I am 

 uniting them. A large number sent me by Mr. Bedford from the Gomplwcarpus 

 (a plant used to adulterate senna) vary to some extent. This species is 



