70 



DIASPIN^ : PUPARIUM OF FEMALE. 



or limbs (Fig. 1). In all other genera that I have 

 observed the whole of the larval skin is attached to the 

 dorsal scale of the puparium, the rupture occurring on 

 the under surface of the head at a point between 

 the antennae and the rostrum, the antennae remaining 

 attached to the anterior margin, while the rest of the 

 ventral parts, with the limbs and rostral apparatus, are 

 pushed back to the posterior extremity " (Fig. 2). After 

 the change the apodous insect soon grows beyond the 

 limits of the larval exuviae, and, in order to protect its 

 body, covers it with secretion, which is either formed 



FIG. 3. 



FIG. 3. Female puparium of Aspidiotus aurantii : a, larval exuviae 

 hidden by opaque secretionary covering ; 6, second exuviae ; c, sub- 

 lying female ; d, secretionary portion. 



FIG. 4. Female puparium of Chionaspis aspidistrse : a, larval exuviae ; 

 b, second exuviae; d, secretionary portion. 



in a circle round the larval exuviae as in Aspidiotus, 

 Diaspis, etc. (Fig. 3), or extended backwards as in 

 Chionaspis, etc. (Fig. 4). Beneath this covering the 

 second and final moult is effected, either by the whole 

 of the ventral parts of the insect being pushed back to 

 the posterior extremity, which together with the dorsal 

 skin remains attached to the secretion, thus forming 

 the second exuviae or pellicle; or the moulted skin 

 remains intact, and completely encloses the adult 

 insect. In this latter case the cast skin, necessarily 



