AFRICAN APHIDIDAE — PART 11. 



123 



is covered with reticulation, each space having a central spot. This I have found 

 very marked in the spirit specimens sent me and the same showed in the East African 

 ones. Also it appears from Mr. Willcocks' notes that some apterous females have 

 the black transverse bars, which occur on the apical segments, merging into a blackish 

 dorsal median area. The younger females, he says, are olivaceous and sparsely 

 covered with a farinose secretion, which overlays the dark colour and gives them a 

 slaty grey appearance, just as in Aphis rumicis when on broad beans. 



Aphis compositae, sp. nov. (fig. 17). 



Alate viviparous female. — Head and thorax dark; abdomen paler (colour?). 

 Antennae shorter than the body, dark brown all over ; first segment a Uttle wider 

 but no longer than the second ; the third longer than the fourth, but not as long as 

 the sixth, with 14-18 sensoria on one side, reaching to the apex of the segment ; fourth 

 shghtly longer than the fifth, the latter with a sub-apical sensorium at a Httle distance 

 from the tip ; the sixth as long as the fourth and fifth, its basal area about one-third 

 the length of the flagellum ; a few hairs on all the segments, which are imbricate or 



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Fii^. 17. Aphis compositae, ep. n. ; 

 A, antenna of alate ? ; P», cornicle ; C, cauda. D, antenna 

 of apterous $ ; E, cornicle ; F, lateral pap?lla on abdomen. 



striate. Eyes large, black ; stemmata distinct. Prothorax with a papilla on each 

 side. Abdomen with dark transverse bars, large dark lateral spots, and a dark area 

 at the base of the cornicles. Cornicles black, about as long as the third antennal 

 segment, cyhndrical, or shghtly expanding at the base, strongly imbricated and with 

 some complete striae, which may be forked or variously branched. Cauda black, 

 spinose, with several lateral hairs, which are curved at their apices, about half the 

 length of the cornicles ; anal plate black and spinose. Legs pale, with the apices 

 of the femora and tibiae and the tarsi dark ; tibiae hirsute. Wings tinged with 

 brown, veins and stigma yellowish brown. The abdomen has a prominent lateral 

 papilla before the hind legs, is shghtly raised at the sides and bears a few moderately 

 long hairs. Length, 2 mm. 



Apterous viviparous female. — Black ; antennae pale in the middle ; tibiae and 

 bases of the tarsi pale . Antennae shorter than the body ; the first two basal segments 

 dark, the first wider and very shghtly longer than the second ; the third and fourth 



