AFRICAN APHIDIDAE — PART II. 149 



Larva (at birth). — Colour orange ; eyes dark. Legs and antennae very pale 

 smoky. Length, 0-6 mm. 



Nymph. — Pale yellow, rather a lemon yellow or sUghtly primrose ; apex of 

 abdomen with a tuft of white flocculent secretion. Head rather an obscure yellow, 

 primrose. Eyes black, a prominent dusky spot on the eyes. Antennae pale. Thorax 

 clear primrose yellow. Wing-buds yellow, of a slightly paler hue than the thorax, 

 tips faintly shaded. Abdomen clear primrose yellow ; a mass of white flocculent 

 matter at the apex. Legs ochreous or an obscure yellowish smoky hue, sparsely 

 covered with meal. 



Egypt : Near Tanta, Cairo and Mansourah, 16. v. 1909 (i^. C. Willcocks). 



Food-plants. Poplar {Populus sp.). 



Described from a number of alate females sent me by Mr. Willcocks and his colour 

 notes from living specimens. The galls which I have figured (fig. 36) are very marked, 

 being large irregular globular masses ; in the specimen sent me three are united 

 together. They somewhat resemble in form those of TuUgren's Pemphigus 

 lichtensteini, but are formed by a clearly distinct species, as the fifth antennal 

 segment has a very marked large sensorium, quite unlike that in TuUgren's figure 

 (Arkiv. fiir Zoologi, v, p. 150, fig. 71a, 1909). 



Tychea phaseoli, Pass. (fig. 37). 



Passerini, Gh Afidi, p. 39 (1860) and Aphid. Ital., p. 81 (1863) ; Buckton, Mono. 

 Brit. Aph., iii, p. 90, pi. cxxviii (1882). 



Alate viviparous female. — Head black, dull ; hairs pale ; eyes black. Antennae 

 with segments 1, 2 and 3 black, 4, 5 and 6 paler, smoky in hue ; the posterior part 

 of the head may be an obscure greyish-green. Pronotum with anterior edge dark, 

 darker still at sides ; posterior portion obscure greyish-green ; meso- and meta- 

 notum black. Abdomen dull brownish- orange with a median longitudinal irregular 

 brown area, extending from the third segment to the apex. This brown area is not 

 regular, and shades into brown specks at the margins ; posterior margins of basal 

 segments distinctly green ; apex dark ; anal plate black ; venter more or less obscure 

 orange, shghtly farinose, the mealy matter white ; sternal plate black. Proboscis 

 reaching the second coxae, the two apical segments black, base black, pale in middle. 

 Legs : front pair black, hairs pale ; median and posterior pairs also black, except 

 apices of femora which are grey. Wings with dark smoky costa, blackish cubitus 

 and smoky stigma ; veins smoky ; insertions of wings pale ; in the second pair the 

 cubitus is ochreous and the obhques pale ; wings iridescent in some fights. When" 

 mounted in balsam the abdomen shows darker transverse bars behind and five smaU 

 dark spots on each side. Antennae shorter than head and thorax, of six segments ; 

 basal one small, second more than twice as long, rounded at apex ; third small, but 

 shghtly longer than the sixth, with eight sensoria, four large, the others smaller ; 

 fourth segment about as long as the fifth and as long as the second, with 2-3 sensoria 

 near the apex ; fifth with a single large subapical sensorium ; sixth with a short 

 blunt nail and sensorium at its base ; all the segments with fine, rather long hairs. 

 Cauda small, semicircular, with short fine hairs ; anal plate with longer hairs. Mid 

 pair of legs nearer to the hind than to the fore pair ; hind tibiae slightly curved 

 (0177) E 



