Packard.] INSECTS OF THE PLANT HOUSE. 
117 
the body is a series of minute tubercles, alternating with the 
fine hairs fringing the edge. 
Another destructive scale insect is represented by figure 
81 (a, male ; 6, female ; cZ, scale ; c, female of another species 
Fig. 81. Fig. 82. 
b 
Orange Scale Insect. Fern Scale Insect, 
also found on the orange). It is the orange bark louse, and 
infests both the orange and lemon. It is so abundant at 
times that all the branches of the plant have to be cut back 
to the trunk. It closely resembles the apple scale insect, and 
is called Aspidiotus Gloverii. fig. 83 . 
It is possibly the A. aurantii 
or citri of southern Europe. 
The fern bark louse, or 
scale insect (Fig. 82 ; 6, un¬ 
derside ; enlarged), found fre¬ 
quently on ferns of the genus 
Pteris, seems to be identical 
with the Lecanium of the 
ferns, L. filicum of European 
authors. It is regularly oval 
elliptical. Along the middle 
of the body runs a prominent Lecanium platycerii and larva, 
ridge, considerably thickened in the middle, with two trans¬ 
verse ridges. It is of a rosy tint, pale around the edge of 
the body, and with a darker patch in the angles between the 
median and transverse ridges ; beneath flesh-colored. 
21 
