328 



FRED. V. THEOBALD- 



A.ntcuuae dark ; base of third segment pale ; legs black ; anal plate and eanda 

 black. Antennae a little more than half the length of the body ; first segment 

 wider than, but of the same length as, the second, both black ; third segment the 

 longest, basal half pale, all the rest of the antennae dark brown to black ; fourth 

 segment a little longer than the fifth ; fifth with a subapical sensorium ; the sixth 

 shorter than four and five together, its basal area about half the length of the 

 fifth ; all the segments imbricated and with a few short, stiff' hairs. Head with 

 a few fairly long hairs. Proboscis reaching to the third coxae, thick, dark at 

 the apex. Pronotum with a small pale lateral blunt papilla, another about the 

 level of the third pair of legs, and another between the cornicles and cauda. 

 Cornicles jet-black, thick, expanding basally, prominently and closely imbricated. 

 Cauda prominent, rather less than half the length of the cornicles, with seven 

 pairs of lateral hairs ; anal plate black, spinose, with several apical lateral hairs. 

 Cuticle of abdomen reticulate, a few hairs over the surface. Legs black, 

 moderately long and rather thick. Length 2 to 2*3 mm. 



Fig. 10. — Aphis nigripeSj Theo. ; (A) head and antenna, (B) cauda, and (C) cornicle of 

 apterous £ ; (D) base of antenna, and (E) proboscis of alate 9 5 (F) cauda of nymph. 



Alate viviparous female. — Head brown ; eyes black. Pronotum yellow ; 

 thoracic lobes black. Abdomen citron yellow, with three black spots and three 

 pairs of smaller dark specks interior to them on each side ; a large black spot 

 behind the base of the cornicles. Antennae dark. Cornicles, cauda and anal 

 plate black. Legs black. Wings with yellowish brown veins and yellow 

 insertions. Antennae with the first segment wider and longer than the second ; 

 the third with eleven to twelve sensoria along one side, the two basal ones united, 

 imbricated and with a few short hairs. Proboscis not quite reaching the third 

 pair of legs, thinner than in the apterous female, the last two segments dark, the 

 rest pale. Metanotum and metasternum black. Cauda black, curved upwards, 

 with three pairs of lateral hairs, a little more than half the length of the cornicles ; 

 anal plate black, with many hairs. Cornicles black, cylindrical, slightly expand- 



