_THE OYSTER-SHELL SCALE AND THE SCURFY SCALE. 5 
FOOD PLANTS. 
The oyster-shell scale has a wide range of food plants, but is com- 
monly found on apple, maple, horse-chestnut, poplar, willow, and 
lilac. 
occur throughout the world: 
Alder (Alnus rugosa Spreng.). 
Almond (Prunus sp.), China. 
American aspen (Populus tremuloides 
Michx.). 
American bladdernut (Staphylea trifolia 
Linn.). 
Amorpha sp. 
Andromeda sp. 
Apple (Malus sylvestris Miller). 
Apple, crab, (Malus sp.). 
Apricot (Prunus armeniaca Linn.). 
Arrow-wood (Viburnum spp.). 
Ash (Fraxinus americana Linn.), (F. ex- 
celsior Linn.), (Fravinus spp.). 
Barberry (Berberis sp.). 
Balm of Gilead (Populus balsamifera 
Linn.). 
Basswood (Tilia americana Linn.), (7. 
angustifolia). 
Beech (Fagus atropunicea Sudw.). 
Bilberry (Vacciniwm myrtillus Linn.). 
Birch, white (Betula populifolia Ait.). 
Birch, river (Betula nigra Linn.). 
Bittersweet (Celastrus scandens L.). 
Blackthorn (Prunus spinosa Linn.). 
Blueberry (Oxycoccus sp.). 
Box (Buxus sempervirens Linn.). 
Boxelder (Acer negundo Linn.). 
Broom (Cytisus scoparius Link.), Gurnsey. 
(C. nubigensus Link.), from Gurnsey (?). 
Buckeye (Aesculus glabra Wild.). 
Buckthorn (Rhamnus cathartica Linn.). 
Butternut (Juglans cinerea Linn.). 
Calluna sp. 
Camellia sp. 
Camphor tree (Cinnamomum camphora 
(L.) Nees & Eberm.). 
Cassia sp., in greenhouse. 
Cherry (Prunus sp.). 
Chestnut (Castanea americana Ral.). 
Clematis paniculata Thunb. 
Cocoa palm (Cocos nucifera L.). 
Cotoneaster sp. 
Cranberry (Oxycoccus sp.). 
Currant, black (Ribes nigrum Linn.). 
Currant, mountain (Ribes alpinum). 
Currant, red (Ribes rubrum Linn.). 
The following is a list of the plants on which it is known to 
Dogwood (Cornus alba Linn.), (C. alba 
var. sibirica. Lodd.), (?C. alterna 
Marsh), (C. californica C. A. Mey), (C. 
sanguinea Linn.). 
Elm, English (Ulmus campestris Smith). 
Elm, purple-leaved (Ulmus scabra var. 
purpurea Koch). 
?Euphorbia palustris Linn., Germany. 
False bittersweet (Celastrus scandens 
Linn.). 
Fig (Ficus carica Linn.). 
Filbert (Corylus sp.). 
Ginseng (Panax quinquefolvum Linn.). 
Gooseberry (Ribes cynosbati Linn.). 
Goatsbeard (Arwncus sylvester Kost.). 
Grape (Vitis vinifera Linn.). 
Hackberry (Celtis occidentalis linn.). 
Hawthorn (Crataegus crus-galli Linn.), (C. 
oxyacantha Linn. ). 
Helianthemum chamaecistus Mill., Eng- 
land. 
Heath (Erica sp.), England and Sweden. 
Heather (Calluna sp.). 
Holly (Ilex crenata Thunb.). 
Honeysuckle (Lonicera sp.). 
Hop tree (Ptelea trifoliata Linn.). 
Horse-chestnut (Aesculus hippocastanum 
Linn.). 
Hovenia inaequalis. 
June-berry (Amelanchier spp.). 
Leather leaf (Chamaedaphne calyculata 
- Moench). 
Lilac (Syringa persica Linn.), (S. vulgaris 
Linn.). 
Lime (Citrus sp.). 
Linden. (See Basswood.) 
Locust, cultivated (Robinia pseudacacia 
Linn.). 
Locust, water (Gleditsia aquatica Marsh). 
Maple, red (Acer rubrum). 
Maple, striped (Acer pennsylvanicum 
Linn.). 
Maple, sugar (Acer saccharum Marsh). 
Maple, mountain (Acer spicatum Lam.). 
Mespilus cuneata Miq. 
Moose-wood (Dirca palustris Linn. ). 
Mountain ash (Sorbus americana Marsh). 
