II© ON THE SCALE INSECT OF MULBERRY TREES. 



color than the remaining portion of the body. The ventral side 

 of the pygidium is nearly similar in color, form, and nature to 

 the dorsal. The lateral margins of the pygidium are irregularly 

 dentated, and bear a few spines bifurcated, or divided into three 

 short branches ending with a fine slender filament, and also a 

 few short simple hairs. At the free narrow posterior end of the 

 pygidium, there lie two short and wide processes arranged 

 very close side by side. At the portion nearly anterior to one 

 third of the ventral side of the pygidium, there lies a small 

 genital opening. On the three sides of the genital opening, there 

 can be seen five groups of very small polygonal or circular areas, 

 of which one is on the anti-median portion of the opening, and 

 the remaining four (two on each side) on the lateral portion of 

 the same. Each of the groups is more or less oval and elongated, 

 and they lie close to each other end to end. These polygonal or 

 circular areas are marked on their surface with a number of 

 minute dots. They are considered as secretory pores by Tozetti, 

 and Franceschini' in the species Diaspis pentagonia, Targ., but 

 I think in my specimen, they are not secretory pores, being 

 simply a sort of markings (Fig. 5, PI. I.). The antennae (Fig. 6, 

 PI. I.) are two in number, and lie close at their base on the 

 ventral side of the first segment near its free anterior edge. They 

 are formed of a single stout broad piece, having three processes 

 of variable size, at the base of which is beset a single long bristle 

 (Fig. 6, PI. I.). 



The mouth parts (Fig. 7, PL. I) are modified into four long 

 filaments (mandibles and maxillae) which are inserted on a 

 small process at the ventral side of the first segment of the body. 

 They arise from one and the same point, and all of them are 

 closely applied to each other, so as to form a single long brown- 

 ish thread, whose length (1,2 mm.) is a little less than that of 

 the body. The insect remains attached to the bark by penetrat- 

 ing the thread deep into the bark of the mulberry tree in order 

 to suck the nourishment. 



Anterior to the insertion of the thread, there lies a nearly 

 triangular and somewhat concave space, which is protected on 

 all sides by a rectangular chitinous ring which lies just beneath 

 the skin. This concave space seems, however, to have a func- 

 tion similar to the sucking discs on the arms of the cuttle-fish, 



