342 FRED. V. THEOBALD. 



hairs on each side, some 3 on one side, 6 on the other, and others seem to have them 

 paired ; all show 2 prominently curved ones at the apex and a sub-apical straight 

 one. 



There are some discrepancies seen in Schouteden's description of Toxoptera 

 iheobromae from cacao in Africa, notably that he describes " the antennae with 

 distal part black," and does not mention the marked annulation, and some slight 

 divergence in the ratio of the cauda and cornicles in the apterous female. He 

 speaks of the cauda as being " conical," which seems to point to the description 

 of an immature apterous form. I feel confident, however, that it is only 

 Nietner's Aphis cqffeae, as all the specimens I have seen from Ceylon and 

 Assam and from Africa on tea, cacao and coffee are undoubtedly the same. There 

 is considerable variation in (i) colour, (ii) the staining effects in alcohol, (iii) the 

 ratio of the cornicles and cauda, (iv) to a slight extent in the sensoria on the third 

 antennal segment, and (v) in the number of the caudal chaetae. But this may be 

 noticed in many^ther Aphids, such as A. nerii, Sch., A. rumicis, F., A. gossypii, 

 Glover, etc., both as regards colour and antennal sensoria, these being all species 

 which live on manv host-plants. 



