AFRICAN APHIDIDAE.— PART IV. 



71 



basal one larger than second, the third the longest, as long as or longer than'^+D ; 

 the fourth shorter than fifth, with a simple round sub-apical sensorium ; the fifth 

 with the flagellum short, about half the length of the basal area, which is equal 

 in length to the fourth segment ; third to fifth imbricated. Cornicles cone-shaped, 

 of Lachnid appearance, more or less circularly striate. Two long, pale, acuminate 

 anal cerci, striate and about the length of the fourth antennal segment to a little 

 longer. Anal plate pale, small, with a few longish hairs. Cauda inconspicuous. 

 Legs rather short and thick. The posterior integument is striate, but not so mark- 

 edly as the cephaUc. The proboscis in all the mounted specimens is bent forwards' 

 but appears to reach to about the second coxae. Length, 1'4-1"8 mm. 



Food-plant. Bougainvillea. 



Uganda : Kampala, 14.V.1919 (C. Gowdey). 



Described from a number of apterous viviparous females. It is a very marked 

 insect on account of the two posterior cerci. The head and body seem almost} 

 devoid of hairs, except posteriorly. The nymphae have long narrow wing-buds. 



Forda natalensis, sp. nov. (Fig. 6). 



Apterous viviparous female. 



Globular, much domed dorsally, flattened ventrally. Grey, greyish white to brown ; 

 antennae, proboscis and legs brown. Segmentation marked posteriorly. Antennae 

 from one-fourth to one-fifth the length of body ; of five segments, basal one about 

 half the length of second, third the longest, about as long as 4-f5 ;Jfourth shorter 



JX UWUU 



Fig. 6. Forda natalensis, sp. n. : A, head ; B, cauda, C, integument 

 of apterous viviparous $ ; D, nymph. 



than fifth ; fifth with a short blunt nail, a large rather projecting sensorium at its 

 base and traces of a secondary one, also a round sensorium at the apex of the fourth ; 

 slightly hairy ; last two segments darker than remainder. Vertex fiat, with a few 

 short blunt hairs. Eyes very small, black. Proboscis reaching to near the third 

 pair of legs or just past them, moderately broad ; apical segment a little longer 

 and narrower than the penultimate, with a few short hairs. Legs rather short 

 and thick, prothoracic shorter than mesothoracic, the latter shorter than the 



