114 ON THE SCALE INSECT OF MULBERRY TREES. 
on the front edge are beset two small- bristles. Anteriorly on 
the ventral surface of the first segment are provided two long 
antennæ. Each of them is composed of five segments, of which 
a single terminal one is nearly of the same length as that 
of the four remaining segments taken together. The antennal 
segments are provided with a few hairs, and the terminal 
segment with a single long hair. 
The mouth parts, which are similarly modified as those of the 
mother insects, lie also on the ventral side of the first segment, 
and the position where they are inserted is marked off with a 
slight elevation. A filament formed of modified mouth parts lies 
beneath the cuticula of both thoracal and adbominal segments. 
It i uns straight to the middle portion of the adbomen, and the 
running up to the first thoracal segment, turns again downwards 
so as to form a sort of long oval loop. The last, that is the ninth 
segment, is provided with two stout chitinous processes at its 
free end, between which are inserted two long slender bristles. 
The three pairs of legs on the thoracal segment are of the 
same size and of similar structure. They are short and stout, 
the coxa and trochanter are distinct, the femur is nearly oval 
and the largest of all the segments, the tibia and tarsus are 
amalgamated into a single long segment, but the former, much 
reduced in size, is marked off from the tarsus by a fine trans¬ 
verse line. The tarsus is long, slightly widened at the free end 
bearing a simple claw, and the former has a slight notch just 
behind its free end (Fig. 12, b. PI. I.). 
The larvae of this stage are very active, and they crawl 
about in every direction on stems or branches particularly in 
cracks. After remaining in this condition 3-4 days without tak¬ 
ing nourishment, they undergo a first moult. 
When the larvae has ended its first moult, it grows to a size 
of 0,38 mm. and 0,18 mm. in length and breadth respectively, 
and its color becomes paler than in the previous stage. Further 
on, it attains 1,0 mm. in length, and undergoing a second moult, 
becomes either a male or female pupa. 
In this larval stage (Fig. 13,14. Ph II.), a filamentous mouth 
part (rostral setae) becomes free, and the larva, projecting it deep 
into the bark of mulberry tree to imbibe the sap, remains attach¬ 
ed to the same spot without changing any longer its position. 
