120 
ON THE SCALE INSECT OF MULBERRY TREES. 
III. Larva in the first stage. 
a. The body is composed of nine segments. 
b. On the circumference of the body there are no 
depressions. 
c. The antennæ are composed of five segments. 
d. No particular depressions at the insertion of the 
ântennæ. 
e. The rostral setae lie beneath the skin. 
IV. Larva in the second stage. 
f. There are two spinnrets dorsally on the first segment 
of the body. 
g. Dorsally and ventrally along the sutures of the 
posterior segments, there lie some secretory pores. 
h. The rostral setae become free and unrolled. 
In addition to these differences, we also notice that our 
’s 
scale insect copulates, and is not parthenogenetically re¬ 
produced, and the generation is effected only twice a year, 
not thrice as in Diaspis pentagonia, Targ. 
V). Damage done by the Scale Insects, 
and Preventive Measures. 
The scale insect is widely distributed over nearly all the 
provinces of Japan, where the mulberry tree is cultivated. It is 
not only parasitic on the mulberry trees, but may also be 
found in many other plantations.—such as Brousonetia papy- 
rifera, Prunus pseudo-cerasus, Paulowina imperialis, Prunus 
persica, Pæonia Moutan, Sterculia plantanifolia, some species 
of Bambusa, &c. It frequents mostly those mulberry trees 
which are thickly planted, or else those which are planted in 
shady places, which are not directly exposed to sunshine or 
wind. It may be found parasitic everywhere on stems or 
branches of mulberry trees, but it most frequently attacks the 
lower parts of the stem, a few inches or rather more above the 
ground. The presence of the parasite as mentioned before, can 
easily be recognized at a certain season by a snowy white ap¬ 
pearance on the stems or branches, which are thickly covered 
with the cocoons of the male scale insects. On the contrary 
