THE APHID OF TEA, COFFEE AND CACAO. 341 



than the head and thorax, shows small dark lateral specks. Antennae (fig. 1, d) 

 not quite so long as the body ; the two basal segments black ; remainder as a 

 rule all pale with four black rings, as in the alate female — in a few the flagellum 

 may be all dark, especially in immature forms ; third segment slightly longer 

 than the fourth— in a few markedly longer ; fourth and fifth about equal ; sixth 

 as long as or slightly longer than 4+5, its basal area about one-sixth the length 

 of the flagellum ; all the segments from 3 to 6 imbricated. Cornicles (fig. 1, e) black, 

 thick, cylindrical, shghtly expanding basally, about as long as the fourth antennal 

 segment, more or less markedly imbricated. Cauda black, more or less bluntly 

 acuminate, from nearly half as long to nearly as long as the cornicles and with 

 several hairs ; in immature forms it is conical. Anal plate black, spinose, and with 

 some long hairs. Legs moderately long and thick ; femora mostly black ; apices 

 of tibiae black, vest yellowish ; tarsi blackish ; tibiae and apices of femora with 

 short hairs. A small papilla on each side between the cornicles and cauda ; one 

 on each side of pronotum, one between second and third legs, and one between the 

 latter and cornicles (as in fig. 1, f). A few scattered hairs on the body. Eyes large 

 and black. Cuticle ornamented much as in the alate female. Length, 16-2 mm. 



a. 



Fig. 3. Oniameutation of the cuticle in Toxoptera coffeae, occurring 

 in alate and apterous specimens from both tea and cacao : a, area near 

 cornicles ; h, cuticle of lower surface ; c, cuticle on anterior part of body. 



The proboscis seems variable in specimens from all three host-plants ; it may 

 reach or even slightly pass the third coxae, or may end close to the second. 



Food-plants. Tea, cacao and coffee. 



Ceylon: Peradeniya,. 25.x. 16; ii.l6, on cacao {E. E. Green), on tea 

 {Buckton), on coffee (Nietner) ; Eltofts, Bogawantalawa, x.l6, on tea {Green). 

 Assam {G. Watt), on tea (shde given me by Mr. Green). Java. S. Nigeria 

 {A. D. Peacock). Kamerun : Moliwe, Mabeta, Victoria and Bibundi (Basse). 

 French Congo (Heim). Uganda: Kampala, l.vii.l2, on cacao and on coffee, 

 4.viii.l6 (C C. Gowdey). Belgian Congo, on cacao. British West Indies : 

 Montserrat, amongst cacao flowers, v. 11 (specimens from Imperial Dept. of 

 Agriculture). 



There is considerable variation in this species from any one of its three host-plants 

 in regard to wing venation, the relative length of the cornicles and proboscis, and 

 in colour. The general facies of the species however seems distinctive, notably the 

 antennal banding and the marked sculpturing of the cuticle. There is certainly a 

 divergence in the antennal sensoria and in the apex of the antennae sometimes being 

 dark, but such variations often occur in many species. The caudal hairs also seem 

 to me to vary to some extent (possibly owing to mounting). Some show only 5-6 



