AFRICAN APHIDIDAE. 331 



sensorium ; sixth short, about as long as four and five ; basal process rather more 

 than half the length of the flagellum, with a group of sensoria at its apex ; all the 

 segments imbricated and with a few hairs. Legs usually deep brown to black, 

 but a few seem to have paler legs, thicker than in the alatae and not quite so long, 

 hairy. Proboscis short and thick, dusky at the apex, reaching the second coxae. 

 Cornicles black, imbricated, rather short, sometimes cylindrical, or slightly ex- 

 panded basally, or else expanded in the middle or towards the apex. Cauda and 

 anal plate black, hairy and spinose, hairs rather long and pale. Length 1*2 

 to 1*5 mm. 



Nymph. — Paler than apterous females, but with brown legs, black cornicles 

 and black rounded cauda, wing-cases greenish ; head brown. Antennae with 

 third and fourth segments paler. Proboscis short and thick, dusky at the apex, 

 not quite reaching the second coxae. Length 1"5 to 1*8 mm. 



British East Africa : Njoro, i. 1912 (T. J. Anderson). 



Food-plants : Broom Corn and Barley. 



I at first took this insect to be the European and American Aphis (Siphororyne) 

 avenae but I now think it must be distinct. The antennae of the alate females do 

 not agree ; in avenae the third to fifth segments are usually provided with sensoria, 

 there are none on the fifth in africana and none to very few on the fourth. 

 Moreover in avenae the legs are not all black as in africana ; and in the aptcrae 

 of the latter only the third segment of the antennae is pale, whereas in avenae 

 the first three segments of the antennae are pale, and the nectaries are pale with 

 a dusky apex, while the exserted tail is more than half the length of the cornicles. 



But as Pergande says (Bull. 44, U.S. Dept. Agric. Div. Ent. p. 10, 1904) that 

 there is some variation in the tuberculation of the antennae and as undoubtedly 

 pale-legged varieties occur in Africa, it is possible that this is only a variety 

 of avenae. There are also marked differences in the cornicles of this species 

 from those of A. avenae off corn received from America or found by me in 

 England ; but they resemble the cornicles of the form found on apples in 

 Europe. I hope to deal fully with this species at a future date. 



Myzus persicae, Sulzer. 



Sulzer, Abg. Gesch. Ins. p. 105, pi. ii, figs. 4 and 5 (1776). 



This species has been recorded as the Black Peach Aphis by Lounsbury and Fuller. 

 As pointed out, the Black Peach Aphis is Aphis persicae, Boyer, and all records of the Myzus 

 evidently refer to that species. 



Myzus cerasi, Fabricius. 



Fuller records Myzus cerasi, F., from Natal (Second Report Gov. Ent. 1901, p. 27, 1902) as 

 the Black Peach Aphis. Evidently this is Aphis persicae, Boyer. 



Hyalopterus pruni, Fabricius. (The Mealy Plum Aphis.) 



Hyahpterus arundinis, Fabricius. 

 Hyalopterus phragmiticola, Oestlund. 

 Fabricius, Sp. Ins. ii, p. 385 (1781); Kaltenbach, Mon. Pflanz. pp. 52, 54, 

 (1843) ; Koch, Die Pflanz. p. 21, figs. 27-30 (1857) ; Buckton, Mon. Brit. Aph. 

 ii, pp. 110-111, pi. lxxv, figs. 1-5 (1877). 



Eygpt : Cairo (F. C. Willcocks). — Europe generally. 

 Food-plants : Prunus spp. and various Rushes (Arundo). 



