118 
HALF HOURS WITH INSECTS. [Packard. 
Another Lecanium found on the leaves of Platycerium 
alcicorne is L. platycerii. The scale is regularly oval, flat¬ 
tened, slightly convex above, with a slight ridge along the 
middle of the body. In dry specimens, especially the smaller 
ones, there are minute ridges radiating from the middle to 
the outer edge. The body of an adult female (Fig. 83, and 
larva, enlarged) is entirely flat beneath, finely granulated, 
and pale brown above. The young are thin and flat, scale¬ 
like, and of a light reddish brown color. 
The Plant House Aleurodes. —Belonging to a group allied 
to the scale insects is a minute white-winged insect which 
may be found in all its stages on fuschias, the Salvia splen- 
dens, and out of doors in summer, the tomato, rising in 
clouds like snow flakes, when disturbed. These pretty, ac- 
FlG. 84. 
tive beings 
Aleurodes. 
(Fig. 84, en¬ 
larged) have pale, 3 r ellow 
bodies and pure white, un¬ 
spotted, powdery wings, with 
dark red eyes; the beak is 
very long and duskj 7 at tip, 
and reaches be} r ond the base 
Fig. 85. 
of the thorax. In this genus both sexes are winged. The 
young of this species, the Aleurodes vaporarium of European 
authors, is bfoad, oval, thick, with a longitudinal ridge ; the 
abdomen is wrinkled transversely, the head and thoracic seg¬ 
ments being smooth. It is three-hundredths of an inch in 
length. 
The pupa (Fig. 85) is convex, rather thick, oval, ellip¬ 
tical, with a fringe of hair-like filaments around the edge of 
the body, from the top of which arise from six to nine long 
threads. 
The Hot-liouse Thrips (Fig. 86, magnified).—This is one 
of the greatest pests in our liot-houses. It is the Heliotlirips 
hfemorrhoidalis of Burmeister. In all its stages it may be 
found puncturing the leaves of liliaceous plants, azalias, 
22 
