AFRICAN APHIDIDAE — PART II. 



107 



ones to some extent being in groups. Cornicles thicker than in the apterous 

 female, black and similarly ornamented. The proboscis reaches past the base 

 of the second pair of legs, the apical segment as long as the penultimate. 

 Length J 2 '8 mm. ; wing expanse, 7*5 mm. 



British East Africa : Nairobi {T. J. Anderson). 



Food-plants. Compositae and a native plant called " Mocatha." 



Described from a number of ? $, all of which were apterous but one, and this was 

 damaged. It is evidently a black species, judging from the spirit specimens sent 

 to the Bureau, which show ta^ny coloration at the sides of the body. The long jet- 

 black cornicles vary somewhat in length and appearance, most being straight, but 

 some are curved outwards at the tips. I know of no species like it in Europe or 

 America. In alcohol it gave a deep claret stain. Its thick integument made it 

 necessary to boil the specimens in caustic soda for nearly an hour before they could 

 be cleared. 



The species of Compositae upon which they were found was not mentioned. 



Macrosiphum nigrinectaria, sp. nov. (fig. 2). 



Alate viviparous female. — Apparently green, darker in the middle of the abdomen, 

 with three dark pairs of lateral spots. Head light brown. Prothoracic lobes dark. 

 Antennae longer than the body, two basal segments paler than the rest, which are dark 



Fig. 2. Macrosiphum nigrinectaria^ sp. n. ; A, antenna of apterous, $ ; 



a^, a^f variations in the sensoria ; B, cornicle; C, cauda. D, antenna 



of alate $; E, tip of proboscis. 



brown ; the first larger than the second ; the third with a line of 11 to 13 sensoria 

 on one side extending up to about one-third of its length from the apex ; fourth 

 shorter than the third ; fifth shorter than the fourth ; sixth as long as four and five 

 together ; the last three imbricated, and to some extent the apex of the third. Eyes 

 large, black. Proboscis reaching nearly to the third pair of legs ; last two segments 

 dark, nearly equal in length. Wings with yellowish bro^vn veins and stigma. Legs 

 rather long, pale ; apices of femora and tibiae and all the tarsi dusky. Cornicles long, 

 cylindrical, black, reticulate at the apex, the rest imbricated ; either straight or 

 shghtly curved outwards, about one-fourth the length of the body, projecting just 

 beyond the cauda. Cauda pale, long, nearly half the length of the cornicles, bluntly 

 pointed and turned upwards, with three pairs of large lateral chaetae and some smaller 

 ones. Anal plate pale. ^ Length, 2-2 '5 mm. 



