330 



FRED. V. THEOBALD — 



Food-plants : Oleander (Nerium oleander), Asclepias cornuti, Asclepias 

 grandiflora and tuberosity and Citrus aurantii. 



Aphis africana, sp. nov. 



A/ate viviparous female. — Head brown ; thoracic lobes deep brown to black ; 

 abdomen of various shades of green, with dark marks at the sides ; antennae, 

 legs, cornicles and cauda deep brown to black. Antennae shorter than the body ; 

 first segment broader, but scarcely longer than the second ; the third the longest, 

 with 13 to 20 sensoria scattered over it, thicker than the following ; the fourth 

 about half the length of the third, with to 4 sensoria ; the fifth about as long- 

 as the fourth, or slightly shorter, with a subapical sensorium ; the sixth with the 

 basal area nearly as long as the fifth and the flagellum not quite twice its length ; 

 all the segments imbricated and with a few short hairs. Head nearly flat, with a 

 central tubercle in front, and four hairs on the vertex. Eyes large, black and 

 red. Cornicles rather short, black to deep brownish black, in some specimens 

 cylindrical, in others slightly swollen in the middle, imbricated. Cauda not 

 quite as long as the cornicles, black, rounded apically, with several rather long 

 pale hairs ; anal plate large, rounded, black, with long hairs. Legs moderately 

 thick, uniformly dark brown to black, with numerous short hairs. Wings large, 

 with brown veins and stigma. Proboscis short and thick, reaching to about the 

 second coxae. Length 1*5 to 2 mm. 





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Fig. 11. — Aphis africana, Theo. ; (A) antenna of alate 9 ; (B) antenna of A. avenae, F. ; 

 (C) cornicles, and (D) cauda of alate 9 ; (E) antenna, (F) cauda, and (G) proboscis of 

 apterous 9 • 



Apterous viviparous female, — Green of various shades, head darker in front, 

 almost flat in some examples, slightly projecting in the middle in others, with 

 four hairs in front. Eyes large, black and red. Antennae considerably shorter 

 than the body, brown, the third segment paler ; basal segment longer and 

 broader than the second, both dark ; the third the longest ; fourth rather more 

 than half the length of the third ; fifth about equal to it, with a subapical 



