Elm ( Ulmus sp.). 



Gooseberry (Ribes sp.). 



Hawthorn (Crataegus oxyacantha Linn.). 



Hickory, big bud {Hicoria alba Britt.). 



Horse chestnut {Msculus hippocastanum 

 Linn.). 



Peach (Prunus persica Sieb. & Zucc). 



Pear (Pyrus communis Linn.), (P. hetero- 

 phylla Dur.). 



Plum (Prunus pissardii Hort.). 



Plum, common garden (Prunus domestica 

 Linn.). 



Quince (Cydonia vulgaris Pers.). 



Quince, Japanese (Cydonia japonica Pers.). 



Raspberry, black cap (Rubus occidentalis 

 Pers.). 



Red-twigged dogwood (doubtful record). 



Shad-bush (Amelanchier canadensis Me- 

 dic). 



Sweet gum (Liquidambar sp.). 



Sweet pepper bush (Clethra alnifolia 

 Linn.). 



Walnut, black (Juglans nigra Linn.). 



Willow, white (Salix alba Linn.). 



Apple (Pyrus malus Linn.). 



Apple, Chinese flowering (Pyrus specta- 



bilis Ait.). 

 Apple, crab (Pyrus sp.). 

 Ash, European mountain (Sorbus aucu- 



paria Linn.). 

 Ash, mountain (Sorbus americana Ait.). 

 Ash, prickly (Xanthoxylon americanum 



Mill.). 

 Ash, white (Fraxinus americana Linn.). 

 Aspen, large tooth (Po pubis grandidentata 



Michx.). 

 Buckthorn (Rhamnus cathartica Linn.). 

 Cherry, choke (Prunus virginiana Linn.). 

 Cherry, wild black (Prunus serotina 



Ehrh.). 

 Cherry, wild red (Prunus pennsylvanica 



Linn.). 

 Chokeberry (Pyrus fioribunda Lindl.). 

 Chokeberry, black (Sorbus melanocarpa 



C. Koch"). 

 Chokeberry, red (Sorbus arbutifolia <". 



Koch). 

 "Cherry currant. " 

 Currant, red flowered (Ribes sanguineum 



Pursh.), England. ' 



The scurfy scale is especially common on apple and pear, less usu- 

 ally so on cherry and peach, on which latter host in the South, in cer- 

 tain cases which have come under the writers' observations, it proved 

 very destructive, greatly stunting the trees, although none had actu- 

 ally been killed. 



PARASITIC AND PREDACEOUS ENEMIES. 



This species is apparently not so subject to attack of parasitic and 

 predaceous insects as the preceding, or else attention has not been 

 directed to this phase of the insect's economy to an equal extent. 

 The following predaceous species are recorded as feeding upon the 

 scurfy scale: TyroglypJius ma Zus(Sliimer), CMlocorus hivulnerus Muls., 

 and Hyperaspidis sp. 



Among the parasitic Hymenoptera, Ablerus clisiocampse (Ashm.) 

 has been reared from this species, as well as Physcus varicornis How., 

 and a species of the genus Prospaltella . 



METHODS OF CONTROL FOR BOTH SPECIES. 



Preparatory to spraying orchard, shade, and ornamental trees and 

 plants for scale insects, they should be carefully gone over and any 

 dead and weakened parts pruned out. The presence of such dead 

 and dying wood is a distinct detriment, and its removal will greatly 

 simplify the work of spraying. 



[Clr. 121] 



