AFRICAN APHIDIDAE — PART II. 



115 



Rhopalosiphum lactucellum, sp. nov. (figs. 11, 12). 



Alate viviparous female. — Head shiny black ; eyes very dark red. Antennae 

 black ; third segment pale at the base, as long as the body ; first segment longer 

 and wider than the second ; the third nearly as long as the sixth, with 13-18 sensoria 

 along its whole length, mainly on one side ; fourth shorter than third and longer than 

 the fifth ; sixth about as long as four and five ; fourth to sixth imbricated ; a sub- 

 apical sensorium on five and the usual group at base of the flagellum of the sixth (no 

 sensoria on four as in R. lactucae). Pronotum greenish, with black collar, shiny ; 

 in some individuals the colour is obscure brownish-ochreousand the collar black; 

 mesothorax with shiny black lobes, brownish at the sides and wing roots. Abdomen 

 green, dark green to olivaceous green, with dusky or very dark olivaceous markings 

 as shown in fig. 11. In some specimens the abdomen is obscure yellowish-green. 

 Underside of thorax obscure ochreous brown, sternal plates shiny black ; venter 

 dull green. Cornicles dusky or dark olivaceous, median part distinctly paler in some, 

 rather long, slightly swollen on the apical half, faintly imbricated. Cauda dusky to 

 dark olivaceous, quite half as long as the cornicles, acuminate, spinose, with three 

 pairs of lateral hairs. Anal plate dusky. Legs with basal half of femora pale or 

 brownish, apical portion black ; tibiae ochreous with black apices ; tarsi black ; 

 tibiae hairy. Wings iridescent, insertions yellowish ; cubitus yellowish ; stigma 

 smoky ; costa and veins dusky. Proboscis about reaching the 2nd coxae, pale, 

 with dusky apex. Length, 2 mm. 



Fig. 11. Bhopdlosiphum lactucellum, sp. n. ; A, abdominal markings of alate $ ; 

 a, median patch in some examples ; B, abdomen of nymph; b, wing-pads. 



Apterous viviparous female. — Pale yellowish-green to yellow tinged with green. 

 Head pale yellowish-green. Eyes dark brown to black. Antennae about as long 

 as the body ; two basal segments of the same colour as head ; third and fourth pale ; 

 fifth pale, but the apex smoky ; sixth smoky on basal area, paler beyond ; basal 

 segment larger than second ; third about as long as sixth ; fourth shorter than third 

 and longer than fifth ; sixth about as long as four and five, its basal area about one- 

 third the length of flagellum ; fourth to sixth imbricated ; a few hairs. Pronotum 

 pale yellowish-green. Meso- and meta-notum and abdomen pale yellowish-green, of 

 a sKghtly darker hue than head and pronotum ; indications of a dorsal longitudinal 

 line of a darker green colour and faint indications of a lateral hne or more sub-median 

 line of same colour. Apex of abdomen yellowish, tinged with green. Proboscis 

 reaching the second coxae, tip black. Cornicles slightly swollen on apical half, colour- 

 less except at the tip where they are dusky, imbricated, the dark tip with well marked 



