AFRICAN APHIDIDAE— PART III. 



287 



spots, cephalad of the cornicles. Venter of head and thorax dark green ; sternal 

 plates black ; venter of abdomen black. Cuticle of abdomen markedly reticulate. 

 Cauda dark green to dusky black ; in some with a greenish apex ; not so long as 

 the cornicles ; spinose, with four (? three) pairs of lateral hairs, the apical pair curved. 

 Anal plate dark and spinose, with some long apical hairs. Cornicles black ; in some 

 deep olivaceous, with a dusky marking on inner side of base (not equally visible in 

 all specimens) ; slightly expanding basally and strongly imbricated ; imbrications 

 long. Cauda projecting well beyond cornicles. A pale pronotal papilla on each 

 side, one between the meso- and meta-thoracic legs, one caudad of the cornicles, 

 and traces of five lateral abdominal ones. Legs with the first femora dull ochreous- 

 brown ; tibiae ochreous with dark apex ; tarsi black ; second femora dusky, except 

 at base ; tibiae ochreous, with black apex ; tarsi black ; third pair of legs same as 

 second ; in some specimens the legs have a greenish tinge. Wing insertions 

 greenish ; costa smoky ; cubitus green ; stigma smoky ; lower margin greenish ; 

 veins dusky. Length, 2-2 '5 mm. 



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Fig. 12. Aphis acetosella, nom. n. : A-D, alate $ ; E-G-, apterous ?. 



Alate viviparous female (Papaver form). — -Very similar to the preceding form, but 

 the antennae are as follows : first three segments like those of the Rumex form, 

 fourth longer than third, with 1-4 sensoria, three being placed more towards the 

 apex ; basal area of sixth one-fifth the length of the flagellum. 



Apterous viviparous female {Rumex form). — Head greenish to reddish yellow. Eyes 

 deep reddish-brown to black. Antennae not half the length of body ; basal segment 

 greenish ; second greenish, but darkened apically ; third black, except at base ; 

 fourth, fifth and sixth black ; basal segment larger than second ; third longer than 

 fourth, nearly as long as the sixth ; fourth and fifth nearly equal. Thorax and 

 abdomen a rich green with darker suffusions, to a rich yellowish-green. Cornicles 

 greenish, with dusky apices ; cylindrical, slightly expanding basally, faintly 

 imbricated. Cauda yellowish green, not quite so long as the cornicles, blunt ; with 

 four pairs of lateral hairs ; spinose ; projecting well beyond the cornicles. Anal 



