hese 
and most facile means of destroying the Aphis 
brassice is soap-suds.—The apple-leaf plant- 
louse, Aphis pomi, has prevailingly a yellowish- 
green colour ; its ears and legs are blackish- 
brown ; its head, tail, bristle, and rump-horns, 
are black; and its eggs are black and oval, 
and are deposited on the spurs of apple-tree 
branches in October, and hatched at the bud- 
ding of the leaves in spring. The best means of 
destroying this species is soap-suds, mixed with 
tobacco-water.—The pea plant-louse, Aphis pisi, 
when unwinged is of a yellowish-brown colour, 
and, when winged, is green, and has its wings 
transparent. This species is often very destruc- 
tive to pease, and is most effectively combated 
by cutting off the shoots and leaves which it at- 
tacks ; but it is frequently destroyed by a small 
‘ ichneumon which deposits an egg in its body.— 
The vetch plant-louse, Aphis vicie, has a prevail- 
ingly green colour, and is found on several spe- 
cies of vetch—The currant plant-louse, Aphis 
vibis, has a prevailingly shining-green colour ; 
but its eyes are black; its legs are brown; its 
ears are as long as its body; and its tail is blunt. 
It makes the under side of currant leaves pucker 
_ up into yellowish or reddish blister-like protu- 
| berances; it appears singly, or in pairs on leaves 
during two or three weeks in spring; and it 
afterwards emigrates to younger leaves, and ap- 
pears upon them in incredible numbers till about 
the middle of June or July. The best method 
of combating it is to pick off the leaves which it 
attacks.—The plum-leaf plant-louse, Aphis prunt, 
has a prevailingly greenish colour; its ears and 
| legs are green ; its abdomen is raised, plaited, 
and dotted on the edge; its tail is pointed ; and 
its rump-horns are thread-shaped. This species 
infests and often grievously damages the leaves 
and young shoots of plum, apricot, and nectarine 
trees, and may be combated either by picking off 
the leaves which it attacks, or by assailing it 
with a mixture of soap-suds and tobacco-water. 
—The oak-shoot plant-louse, Aphis quercus, has 
prevailingly a brownish-black colour ; its ears 
and the joints of its legs are a rusty-brown ; its 
body is comparatively large; and its sucker is 
very long. This species is represented in Plate 
AVI. Fig. 5, of its natural size, and with its 
sucker bent under it; and in Fg. 6, greatly mag- 
nified, and with its sucker projecting.—The rose 
plant-louse, Aphis rose, is of a green colour ; its 
ears and rump-horns are tipped with black ; its 
ears are very long; and its tail is pointed, but 
has not a bristle. It infests the leaves and 
young shoots of rose plants, and greatly damages 
the florification ; but it is easily destroyed by a 
washing of soap-suds and tobacco-water.— The 
spindle-tree plant-louse, Aphis ewonymz, has a 
prevailingly dark or black colour ; its legs are 
pale, with black joints ; its wings are transparent, 
with a brown spot on the outer edge; its abdo- 
men is brown, with elevated and punctured edge ; 
and its tail-bristle is as long as its ramp-horns.— 
I. 
209 
The juniper plant-louse, Aphis gunipert, is varie- 
gated in the body, and has short, thick, and 
abrupt rump-horns. The wormwood plant- 
louse, Aphis absinthii, found on wormwood and 
mugwort, has a prevailingly black colour; its 
back is grayish, with a large brown spot; and its 
tail-bristle is erect.—The willow plant-louse, 
Aphis salicis, has a prevailingly black colour ; its 
abdomen is dotted with white ; and its rump- 
horns are yellow. This species is stronger and 
larger in the body than most of the aphides, and 
is able to attach itself to the bark of the willow. 
A representation of it is given in /%g. 7—The 
turnip-leaf plant-louse, Aphis rape, is nearly 
allied to the cabbage plant-louse, but can readily 
be distinguished by its long tubes, and the small 
apical cells of its wings. The head of the male is 
blackish ; its collar is ochreous and brown; the 
disc of its thorax is shining black ; its abdomen 
is greenish ; its spiracles or breathing-pores are 
brown; its tubes are long and slender ; its wings 
are iridescent, and have light brown nervures ; 
and its feet, its claws, and the tips of its thighs 
are black. The female is bright green sha- 
greened, and has fuscous horns. 
the latter part of summer ; it infests carrots, beet, 
spinach, tomato, and some other plants ; and itis | 
now pretty widely accused of causing the potato- 
rot, and has thence begun to be designated the de- 
stroyer or Aphis vastator. The male of it greatly 
magnified, is represented in /%g. 8; the natural | 
dimensions of the male in /%g. 9; the female, | 
greatly magnified in /%g. 10; the natural size of | 
the female in /%g. 11; and a leaf infested with 
it in /%g. 12.—All the species now enumerated 
belong to the division with bristle-shaped an- 
tenne ; and the other species of that division | 
are A, viburnt, A. aliheew, A. cardut, A. millefolit, 
A. papaveris, A. sonchi, and A. tanacetd. 
The maple plant-louse, Aphis aceris, remark- | 
able for the very large proportion of honey-dew 
which it sheds, has a prevailingly brown colour ; 
its ears and shanks are pale; its corselet is cylin- | 
drical, narrower than the abdomen, and thick at 
the sides ; its abdomen is keeled, with the sides 
plaited ; and its tail is blunt—The alder plant- 
louse, Aphis alni, has a prevailingly yellowish- 
white colour; its abdomen has tubercles; and 
its eggs are green and covered with a whitish 
powder.—The orache plant-louse, Aphis atriplicis, 
found on the tops of Atriplex hortensis, has a 
prevailingly glossy-black colour ; its shanks are 
pale ; its corselet is nearly blunt; its abdomen 
is plaited at the sides; and its tail is blunt.— 
The birch plant-louse, Aphis betule, has a mixedly 
green and black colour; its head and corselet are 
black ; its abdomen is green tipped with brown; 
its legs are black ; its shanks are pale; its rump- 
horns are green and short ; and its wings have 
three black bands and greenish wingribs.—The 
pine-leaf plant-louse, Aphis pineti, found on the 
leaves of the Scotch pine, is prevailingly black ; 
O 
This species | 
abounds on the leaves of the English turnip in | 
