122 FRED. V. THEOBALD. 



dark, except third to fifth segments, which are pallid yellow ; base of femora and 

 most of tibiae pale yellowish ; rest dark. Head and prothorax narrower than rest 

 of body ; head rounded in front. Antennae shorter than body ; basal segment 

 larger than second ; third longer than fourth, about as long as the sixth ; fourth 

 about as long as the fifth ; the sixth with the basal area about half the length of the 

 flagellum or a little more ; all the segments faintly imbricated. Eyes large, black 

 to dark brown, sHghtly separated from the base of the antennae. Proboscis dark at 

 apex, reaching to second pair of legs. On each side of the pronotum is a prominent 

 tubercle, and the abdomen has two lateral papillae between the mid and hind legs 

 and a smaller one between the cornicles and cauda. Cornicles black, long, cylindrical, 

 slightly expanding at the base, imbricated. Cauda black, spinose, with three pairs 

 of lateral hairs, the apical pair prominently curved at the tips ; from one-half to 

 nearly one-third the length of the cornicles. Anal plate black, with two large hairs 

 on each side. Legs with the femora black, except at the base, where they are yellow, 

 tibiae hairy, yellow, except at the apex, which with the tarsi is black. Lengthy 

 1*8-2 mm. 



Nymph. — " Obscure olivaceous, with two dusky areas, one on each side of the middle 

 line. Head sparsely farinose. Eyes black. Antennal segments 1 and 2 olivaceous 

 or smoky ; 3 and 4 ochraceous ; 5 ochraceous, with apex smoky ; 6 black. Pro- 

 notum olivaceous, deeply compressed laterally, farinose. Mesothorax greenish, 

 farinose ; base of wing-buds greyish green, apices dusky or dark olivaceous. 

 Abdomen olivaceous farinose, median line of a paler hue than general colour of 

 abdomen. Cornicles and cauda black. In some specimens the abdomen is brownish 

 between the cornicles. Femora dusky ochreous, apex dusky ; tibiae ochreous, 

 apex black ; tarsi black." — F. C. W. 



Egypt: Ghezireh, 16.iv.02 ; Gizeh, vii . 09 ; Mehellet, Mousa, 22.iii.10 (/. C. 

 Willcocks). British East Africa : Nairobi {T. J. Anderson). 



Described from a series of alate and apterous females sent me by Mr. F. Willcocks. 

 At first sight this species resembles Aphis rumicis, L., but the alate female can at once 

 be told from that species by the sensorial structure of the antennae. In this species 

 one never finds sensoria except on segment 3, and they vary from 3 to 6 ; in 

 A. rumicis there are many on the third segment and some on the fourth and fifth. The 

 lateral papillae also seem to differ. The specimens from Egypt were all found on 

 beans and cow-peas, but in Nairobi it occurs also on Gleditschia triacanthos, an 

 ornamental leguminous tree from America. In some respects it resembles Aphis 

 tavaresi, Del G., but can at once be told by the fewer sensoria on the third antennal 

 segment and its paler colour. Also the cauda has only three pairs of lateral hairs, 

 the last pair of which are markedly curved at their apex. The brown clouding of the 

 wing membrane also gives it a resemblance to Aphis compositae, described below, but 

 it can be easily separated by the cauda in compositae having 6-7 pairs of lateral hairs. 

 Moreover, it gives in alcohol a brighter port wine stain than any of the other blackish 

 aphides. I have placed the specimens (mostly broken debris) from East Africa 

 here, because on mounting the remains I found they agree with the specimens sent 

 from Egypt. They gave a similar coloration in alcohol. Mr. Willcocks in his careful 

 field-notes adds that this species may have the thorax and abdomen in the apterous 

 female slightly poHshed, and that the most conspicuous feature is in the skin, which 



