288 FRED. V. THEOBALD. 



plate dusky ; spinose, with a few apical hairs. Lateral papillae as in alate female. 

 Legs ochreous ; apical parts of femora brownish ochreous ; tips of tibiae brownish ; 

 tarsi black. Length, 1*5-2 mm. 



Nymph. — Head yellowish green ; eyes dark blackish-brown. First two segments 

 of antennae greenish ; third pale at base ; remainder dusky ; sixth darkest. Pro- 

 notum green, yellowish green at sides. Thorax with median area yellowish green ; 

 future thoracic lobes outlined with deeper green. Base of wing-buds pale whitish- 

 green ; tips dark sepia. Abdomen rich green ; apex paler. Cornicles green, with 

 dusky or black apex. Legs pale ochreous or greenish ; apex of tibiae and the tarsi 

 dark. The nymph shows some mealiness on the head and abdomen subdorsally and 

 laterally in the form of mealy whitish areas, more marked in some specimens than 

 in others. 



Apterous viviparous female (Papaver form). — Somewhat greenish yellow to yellow 

 or pale yellowish-green. Head yellowish ; eyes very dark brown. Antennae with 

 first and second segments of the same colour as the head ; third to fifth pale ; fifth 

 slightly smoky at apex ; sixth smoky. Thorax and abdomen yellowish green. 

 Cornicles pale, with dark apex. Skin of thorax and abdomen very finely wrinkled. 

 Some specimens show a faint median dorsal and submedian lines of a green hue. 

 Legs pale, apices of tibiae pale brownish, tarsi black. 



Nymph. — Head pale yellowish-green ; eyes black. Antennae with first and 

 second segments pale, also third and fourth ; fifth pale smoky, rather darker towards 

 the apex ; sixth smoky. Prothorax green, median area pale. Thorax green or pale 

 green ; thoracic lobes more or less defined by deeper green borders. Base of wing- 

 buds white to green ; wing-buds dusky. Abdomen green ; a median dorsal line of 

 a darker green and submedian lines of the same colour. Cornicles pale, with dark 

 apical ring. Femora pale, with faint greenish reflections ; tibiae pale ; tarsi black. 

 Apex of abdomen pale greenish. 



I cannot see any very marked structural differences between the specimens taken 

 on Rumex and those found by Mr. Willcocks on Shirley poppies in Egypt, except 

 that on the latter plants the basal area of the sixth antennal segment is relatively 

 shorter than in the Rumex form. The colours are the same and the sensorial structure 

 of the antennae, the structure of the cornicles and the cauda agree exactly 

 within general limits. It is likely that there is a migration between Rumex and 

 Papaver and probably other plants, as we see with Aphis rumicis. Thus I have placed 

 the Green Poppy Aphid with the Green Rumex Aphid provisionally. Mr. Willcocks 

 thinks the same species occurs on thistles (Carduus) and lettuce (Lactuca). I can 

 detect no difference between the Green Rumex Aphis of Europe (Aphis acetosae, 

 Koch) and those sent from Egypt. 



Linnaeus', Fabricius' and Buckton's Aphis acetosae, I think, are only pale 

 varieties of rumicis — the dark transverse abdominal bands described being clearly 

 seen in the latter on certain plants and being more marked in certain years than in 

 others when on Rumex. Walker* placed Linnaeus' acetosae as a synonym of rumicis. 

 In 1912 I considered it distinct on account of taking Koch's acetosae for Linnaeus' 

 species.f 



* List. Homopt. Ins. Brit. Mus., pi. iv, p. 982 (1852). 

 f Journ. Board Agric, p. 467 (1912). 



