ON THE SCALE INSECT OF MULBERRY TREES. I I 



vary from a hundred to a hundred and fifty in number. The 

 larger eggs are oblong oval, transparent, and measure 0,05 mm. 

 and 0,025 mm - i° trie longer and shorter axis respectively. The 

 light greenish contents of the eggs are easily seen through the 

 transparent egg-shell. In May and June as well as August and 

 September, the female insects lay eggs by projecting a temporary 

 fleshy process from a genital opening on the ventral surface oi 

 the pygidium (Fig. 10, PI. I.). All the eggs laid, lie usually in 

 groups beneath the body of the mother insect under a scale. 

 Even after the mother insects have finished depositing their 

 eggs, they remain alive for some time. A single female deposits 

 usually about a hundred eggs much larger than the ovarian 

 eggs which were found in the previous spring, but they still 

 retain an oblong and oval form, and measure now 0,247 mm « 

 and 0,114 mm. in the longer and shorter axis respectively (Fig. 

 n, PI. I.). The newly laid eggs are always pale yellow, but 

 later as the embryo is fully developed within the egg, the latter 

 changes from light to deep orange yellow. The larvae are 

 hatched some days after being deposited, and they crawl about 

 from fissures or cracks formed at one or more places along the 

 marginal edge of the scale. At the moment the young larvae are 

 hatched, the transparent thin egg-shell breaks always in one 

 and the same way, that is, from one pole of the egg extends a 

 breaking line as far as the median portion on two sides of the 

 egg-shell. The newly hatched larvae (Fig. 12; 12, a. PI. I.) are 

 oval flat, light orange red in color, the length and breadth of 

 the body 0,266 mm. and 0,193 mm. respectively. The body is 

 covered with a few fine short hairs over its entire surface, and 

 its cuticula is marked all over with very fine wavy lines which 

 are closely arranged side by side (Fig. 12, c. PI. I.). The 

 three regions of the body are not distinct, and the latter is 

 composed of nine unequal segments, of which the anterior first 

 segment is much larger than the last, that is the ninth segment, 

 while both are hemispherical in form. The remaining seven 

 segments are short, but their breadth exceeds that of the two 

 extreme segments. The anterior first segment is marked on 

 either side of the dorsal surface with a longitudinal slight de- 

 pression. On the front of the same surface there lie two small 

 black simple eyes lying wide apart from each other, and further 



