Lettuce - louse. (See Lettuce-louse 
Aphidius.) 
Poplar-louse. (See Poplar-louse Aphi¬ 
dius.) 
Wheat-louse. (See Wheat-louse Aphi¬ 
dius). 
Willow-louse. (See Willow-louse Aphi¬ 
dius.) 
Aphis, viii, 79,122. 
Characters, i, 56; viii, 34,36,37,38,40,84. 
Classification, viii, 33,34,36,37,38,40,44,80. 
Compared with Calaphis betulella, viii. 
111 . 
Hyalopterus, viii, 82. 
Lachnus, iii, 139. 
Myzus, viii, 74. 
Phorodon, viii, 69. 
Rhopalosiphum, viii, 79. 
Sipha, viii, 120. 
Food plants, i, 60; viii, 16,27,28,38. 
Habits, viii, 38,85. 
Nomenclature, viii, 16. 
Reproduction, viii, 29,30. 
Typical species, viii, 42. 
Aphis absinthii, viii. 69. 
acaroides, viii, 211. 
acerina, viii. 78. 
aceris, viii, 49. 
acetosa, viii, 88. 
ambrosia, viii, 211. 
amygdali, viii, 102. 
annulipes, viii, 211. 
aparines, viii, 88. 
apocyni, viii, 94. 
armata, viii, 88. 
asclepiadis, viii, 191. 
var. lutescens, viii, 191. 
atriplicis. viii, 88,193. 
avenae, viii, 51,176. 
beecabungae, viii,97. 
bella, i, 60; viii, 106,107,197. 
berberidis, viii, 81. 
betulse, viii, 110. 
betulascolens, viii, 110,198,199. 
bicolor, viii, 211. 
brassicae, viii, 91. 
bursaria, viii, 34. 
capreae, viii, 84. 
carduella, viii, 100. 
caryae, viii, 116. 
■ caryella, viii, 170. 
var., viii, 171. 
costalis, viii, 171. 
cephalanthi, viii, 97,192. 
cerasi, viii, 42,93. 
cerasifoliae, viii, 42,93. 
cerealis, viii, 51. 
chenopodii, viii, 88. 
cireaszandis, viii, 89. 
coreopsidis, viii, 193. 
eorni, viii, 101. 
cornifoliae, viii, 101,193. 
crataegi, viii, 101. 
crataegifoliae, viii, 101. 
cucumeris, xii, 83. 
cucurbitae, xii, 84. 
dahliae, viii, 88. 
dauci, viii, 181. 
diospyri, viii, 95. 
diplepha, viii, 211. 
discolor, viii, 211. 
euonymi, viii, 88. 
euphorbias, viii, 57. 
fabae, viii, 88. 
fagi, viii, 43,120. 
fraxini, viii, 147. 
fumipennella, viii, 171. 
furcipes, viii, 211. 
galliscabri, viii, 88. 
genistae, viii, 88. 
gibbosa, viii. 211. 
granaria, viii, 51,181. 
helianthi, viii, 194. 
hordei, viii, 51. 
hortensis, viii. 88. 
humuli. viii, 42,87. 
hyperici, viii, 193. 
impatiens, viii, 98. 
laburni, viii, 88. 
lactucae, viii, 61. 
lanigera, viii, 43, 126, 133. (See Woolly 
Aphis of the Apple-tree.) 
lathyri, viii, 64. 
lutescens, viii, 191. 
maculella, viii, 171. 
mahaleb, viii, 70,72. 
maidis, vii, 71, 75, 278; viii, 31, 89; xi, 67; 
xii 41 44. 
mali, vii, 73; viii, 23,25, 42,85. 86,89,94,121, 
130; xi,9. (See Apple-tree Plant Louse.) 
malifoliae, viii, 86. 
marginella, viii, 171. 
marginipennis, viii. 211. 
medicaginis, viii, 101,192. 
middletoni, viii, 99. 
nerii, viii, 95. 
onobryehis, viii, 64. 
oreaster, viii, 211. 
papaveris, viii. 88. 
pastinacae, viii, 84. 
persicac, viii, 42. 
pilosa, viii, 211. 
pinicolens, viii, 102. 
pisi. viii, 64. 
populi, viii, 105. 
populifoliac, viii, 102,151. 
pruni, viii. 42,72,82,87. 
prunifoliae, viii, 87. 
punctatella, viii, 171. 
pyri, viii, 101. 
quercifolias, viii, 79. 
quercus, viii, 108. 
rhodryas, viii, 211. 
ribicola, viii, 76. 
ribis, i, 60; viii, 76. 
