AFRICAN APHIDIDAE — PART II. 



121 



cornicles and cauda are very marked. The presence of sensoria on segment 3 of the 

 antennae is also characteristic ; they vary from one to three, the latter being the 

 usual number. I know of no other related species showing this pecuUarity. 



Judging from the alcohol specimens sent, this insect is black to dark brown. It 

 was found densely clustering on the thistle leaves in colonies, curling them up, and 

 also encrusting the stalks. 



Aphis leguminosae, sp. nov. (fig. 16). 



Alate viviparous female. — Black ; abdomen very dark brown or dull olivaceous, 

 with black transverse median bars and lateral spots. Antennae shorter than the body, 

 the two basal segments dark, third to fifth paler, the apex of fifth and sometimes the 

 fourth darkened ; sixth dark ; basal segment larger than the second ; the third a 

 little longer than the fourth, with from 3 to 7 sensoria ; the fifth of the same length 

 as the fourth, sometimes slightly shorter, with a single sub-apical sensorium ; sixth 

 longer than the third and not quite as long as the fourth and fifth, its basal area 

 about half the length of the flagellum, with the usual sensoria at their junction ; all 



ig. 16. Aphis leguminosaef sp. n. ; 

 A, head and antenna of alate ? ; B, cornicle. C, head and 

 antenna of apterous ?, (a) prothoracic tubercle ; D, lateral 

 abdominal tubercles between mid and hind legs ; E, cauda 

 and cornicles, {a) lateral abdominal tubercle, (6) cauda, 

 (c) anal plate. 



the segments imbricated. Eyes large. Proboscis dark at the apex, reaching to the 

 second pair of legs. Prothorax dark greenish with black collar, and with a blunt 

 papilla on each side. Abdomen with a large papilla on each side between the mid 

 and hind legs and a smaller one between the cornicles and cauda. Cornicles black, 

 rather long and cylindrical, markedly imbricated, but less so at the apex, reaching 

 to or past the tip of the cauda, as long as or slightly longer than the third antennal 

 segment. Cauda black, spinose, with three pairs of lateral hairs, curved at their 

 apex, especially the apical pair, varying from one-third to more than one-half the 

 length of the cornicles. Anal plate black, with two long hairs on each side of the 

 Cauda. Legs moderately long ; femora dark, except at the base ; tibiae pale, except 

 at the apex, hairy ; tarsi dark. Wings tinged with brown ; stigma deep yellowish- 

 brown to smoky, veins yellowish brown ; cubitus ochreous ; insertions yellowish 

 to yellowish green. Length, r5-2 mm. ; wing expanse, 8-8 "5 mm. 



Apterous viviparous fe?nale. — Dark ohve-brown to black, with darker abdominal 

 bars and spots ; skin with marked reticulations, each having a central spot. Antennae 



