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The Rose Scale, Aulacaspis roscc Bouche, Figure 40, a species 
common in Europe, Australia, and Asia, as well as in America, is 
occasionally found in greenhouses, but it is most common out-of- 
doors, where it is often seriously injurious to the rose, the rasp¬ 
berry, and the blackberry. The adult female scale is nearly cir¬ 
cular, and snowy white, with a small pale yellowish or brownish 
exuvium at one end, as shown in Figure 40, a. This is a very 
conspicuous insect, particularly when the infestation is bad. 
The Fern Scale (Hemichionaspis aspidistra? Sign.) is one of 
the more destructive scales infesting greenhouse plants in this 
state, and it is a pest of importance in Europe, Asia, and Austra¬ 
lia. We have taken it on ferns only, oftenest on the Boston and 
maidenhair, which are liable to serious injury by it. Among the 
other more important greenhouse plants which it is known to infest, 
are the orchids*, Ficus*, and orange*. The female scale (Fig. 41) 
Fig. 41. Fern Scale, Hemi- 
chionaspis aspidistra , female 
scale. Greatly enlarged. 
Fig. 42. Fern Scale, 
Hemichionaspis aspi¬ 
distra , male scale. 
Greatly enlarged. 
is more or less oval, pale or dirty yellowish brown, and about 
.08 inch in length. I have usually found the very conspicuous white, 
elongate males (Fig. 42) in much greater numbers than the 
females, which, besides being less numerous, are rather incon¬ 
spicuous. 
The Box Scale (Pinnaspis buxi Bouche =Mytilaspis pandani 
Comst.), Figure 43, has been found on the leaves and tender twigs 
*Reported as a food plant, but not yet found infested in Illinois. 
