274 



FRED. V. THEOBALD. 



shorter than the third antennal segment, in some about as long ; the apex markedly 

 reticulate, remainder imbricated. The black cauda is about half the length of the 

 cornicles, acuminate, spinose ; the spines in rows, longish and thorn-like ; five 

 pairs of lateral chaetae of pale colour ; cauda about level with apex of cornicles. 

 Anal plate black, spinose, with a few long hairs. Abdomen with stiff moderately 



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Fig. 1. Macrosiphum dahliafolii, sp. n., apterous $ : A, head and antenna ; 

 a, sensoria ; B, cornicle ; b, apical sculpturing ; C, cauda ; c, apical 



sculpturing ; D, body hairs. 



long pale hairs, some slightly capitate, arising from dark mammillae ; the lateral 

 edges of the abdomen in places have very short, fine spines. Legs with long, pale, 

 thorn-like hairs, a few being capitate. The dark spots on the body are darkened 

 areas around the base of the hairs. Length, 2 mm. 



Uganda: Kampala, 19.xii.16 (C. C. Gowdey). 



Food-plant. — Dahlias. 



Described from a number of apterous viviparous females sent in spirit, but with 

 no colour notes ; the colour seems however to have been more or less retained and 

 appears to be a rich reddish, with marked black abdominal spots. In general 

 appearance it approaches the European M. solidaginis, but the structure of its 

 antennae and cornicles is quite different. The only known species feeding on 

 dahlias is Aphis rumicis (A. dahliae, Westwood). In some specimens the proboscis 

 reaches well up to and even slightly beyond the third coxae and the cornicles vary 

 in thickness and relative lengths. It feeds on the leaves of the dahlias. 



2. Aphis durantae, sp. nov. (fig. 2). 



Apterous viviparous female. — Very small ("7 to '9 mm.). Greenish to yellowish 

 tinged with green ; two conspicuous dusky areas on the head ; eyes black. Antennae 

 with the two basal segments dusky ; third paler ; fourth smoky ; fifth dusky to 

 black. Cornicles dusky to black. Cauda shaded. Legs obscure ochreous ; tibiae 

 dusky at apex ; tarsi black. Antennae not quite half the length of the body ; basal 



