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 antennae are composed of five segments. 



d. No particular depressions at the insertion of the 



antennae. 



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 

 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, Pseonia 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 



