128 FRED. V. THEOBALD. 



beyond them, spinose, with, three pairs of lateral hairs ; anal plate black. A blunt 

 papilla between the cornicles and cauda on each side. Legs pale, with the apices 

 of the femora and the tibiae and tarsi dark. Length, 1 *2-l *5 mm. 



Egypt : Ghezireh, 20.xi.07 (F. C. Willcocks). 



Food-plant. Chrysanthemums. 



Described from a number of alate and apterous specimens in alcohol. The colour 

 cannot be given, but they were both of a dark hue, the body of the alate female being 

 paler, probably greenish with dark lateral spots. 



This might at i&rst sight be mistaken for Koch's Aphis chrysmithemi, but it has 

 only 7-10 sensoria on the third antennal segment in the alate female, whereas in 

 A. chrysanthemi there are 22-28 sensoria, and the cauda is shorter and more rounded 

 in that species, which is also considerably larger ; my alate females measuring 1 "8 to 

 2 '5 mm. The chrysanthemum aphis of Koch is black and green and this has been 

 taken to be the same species as Aphis cardui, L., by Buckton and Schouteden ; both 

 species certainly have a green and black abdomen dorsally in the alate female. As 

 I have not yet found chrysanthemi on thistles and cannot get that species to breed 

 on any Carduiis, I am temporarily retaining Koch's species. 



I have another British chrysanthemum aphid common on the ox-eye daisy {Chrysan- 

 themum leucanthemum), which also might be cardui, L., but again it does not occur 

 at any time on thistles. 



Walker also describes an Aphis chrysanthemi (Zoologist, vii, App., p. Ivi, 1849) in 

 which the apterous female is dull green and the alate female has a very dark brown 

 abdomen or only variegated with green. I fancy two species are mixed up in his 

 description. Buckton in describing Aphis cardui, L., (Mono. Brit. Aph., ii, p. 92, 

 pi. Ixvii) says the young are green and that it is subject to variation in colour, some 

 being bright golden yellow, with a variable black patch on the dorsum. 



The other typical chrysanthemum aphid is Macrosiphoniella chrysanthemi, Del G. 

 (p. 112). Buckton' s Siphonophora circumflexa, which is a Myzus and not a Macro- 

 siphum, is also common on these plants under glass, and Rhopalosiphum diantha, 

 Sulzer, damages them. Out of doors one may find this last species and also Aphis 

 rumicis, L., injuring chrysanthemums. 



Aphis maidis, Fitch. 



Egypt : Gizeh, Cairo, on wheat {F. C. WillcocJcs). 



Many apterous and some alate $ $, which agree with my American specimens. 



Aphis laburni, Kalt. 



Kaltenbach, Mono. Pflanz., p. 85 (1843). 



Egypt : Gizeh, 1909, on young shoots of Robinia sp. {F. C. WillcocJcs). 



I cannot separate these insects from the laburnum aphis of Europe. 



Aphis medicaginis, Koch. 



Koch, Die Pflanz., p. 94, pi. xvii, figs. 125 & 126 (1857). 

 Egypt : Ghezireh, 8.iv.09, on Medicago sp. {F. C. WillcocJcs). 

 Alate and apterous females. 



