AFRICAN APHID1DAE. 333 



Food-plants : All Citrus trees. 



I cannot separate this African Citrus species from the one I have found in 

 Europe (described by Boyer de Fonscolombe in 1841) on oranges in boxes in 

 September and in greenhouses in April. Its native home is at present unknown. 

 Schouteden places Kaltenbach's Aphis camelliae (Mon. Pflanz. p. 122) as a 

 synonym of this species. I do not think it is the same. Kaltenbach records it 

 from Camellia japonica and Schouteden from Camellias in Brussels (Mem. Soc. 

 Ent. Belg. xii, p. 230, 1906). 



Boyer describes the abdomen of the alate female as having the sides green 

 above and the short cornicles greenish with black apices. In Aphis camelliae the 

 abdomen is brown and the cornicles are moderately long and black. Koch's 

 Toxoptera aurantiae (Die Pflanz. p. 254, figs. 329, 330) from pomegranates has 

 also brown cornicles and a brown body and may possibly be Kaltenbach's 

 camelliae, but I am sure it is not Boyer's Citrus species. 



Buckton's genus Ceylonia (Indian Museum Notes, ii, p. 35) is clearly the 

 same as Toxoptera. 



Toxoptera graminum, Rondani. (The Southern Grain Louse.) (Fig. 14.) 



Aphis graminum, Rondani. 

 Rondani, Nuovi Ann. Soc. Nat. Bologna, (3) vi, p. 10 (1852); Mazzanti, 

 Nuovi Ann. Soc. Nat. Bologna, (3) vi, pp. 342-352 (1852) ; Passerini, Bull. Soc. 

 Ent. Ital. iii, pp. 151, 248, 340, 343 (I860) ; Passerini, Aphid. Italicae, p. 28 

 (1863); Horvath, Rovartani Lapok, i, pp. 143-145 (1884); Sajo, Zcits. fur 

 Pflanzenk. iv, p. 4 (1894); Horvath, Fn. Reg. Hungariae, p. 60 (1897); 

 Del Guercio, Nuove Rel. R. Staz. Ent. Agraria, Firenze, (1) ii, p. 145 (1900); 

 Pergande, Bull. no. 38 n. ser., U.S. Dept. Agric. Div. Ent. pp. 7-19, pi. i 

 (1902). 



A 



< i .I ' TTi.i U /i 



■m— ^ — —L:e>— ' 



Fig. 14.— Antennae of alate £ of (A) Toxoptera graminum^ Rond., and (B) T. aurantii, Boyer. 



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

 Central Europe and North America. 



Foon-rLANTS : Wheat, Barley and Broom Corn in Africa ; Oats, Spelt 

 (Triticum spelta), Couch grass (T. repens), Hordeum marinum, Soft Cheese 

 (Bromus mollis), Corn (Zea mais), Sorghum, Dactylis glomerata, Lolium perenne. 



This aphid, which appears to be mainly found on Graminaceae, is very 

 destructive in parts of East Africa, as well as in Europe and in North America, 

 where it is known as the Southern Grain Louse. 



