PTTPABItJM OF MALE. 



71 



very large, completes the formation of the puparium 

 (PL XXIX, figs. 1, 2; PL XXXIV, figs. 16). But 

 in Aspidiotus (Fig. 3), Ghionaspis (Fig. 4), and other 

 genera the adult insect grows considerably after the 

 second moult, adding during the time a large secre- 

 tionary covering. 



PUPABIUM or MALE. 



Characterised by possessing only the discarded skin 

 (exuviae) of the larva. It is usually begun in the same 

 way as that of the female, but the subsequent and 

 complete formation of the puparium is accomplished 

 by the second- stage insect, and consists entirely of 

 secreted matter. In Aspidiotus (Fig. 5) the secretion- 

 ary portion is arranged in a more or less circular form, 



FIG. 5. 



FIG. 6. FIG. 7. 



a, 



b ... 



FIG. 5. Male puparium of Aspidiotus x 20: a, larval exuviae hidden 

 by opaque secretionary covering; b, secretionary portion. 



FIG. 6. Male puparium of Chionaspis, Diaspis, etc., X 20: a, larval 

 exuviae ; b, secretionary portion. 



FIG. 7. Male puparium of Mytilaspis X 20 : a, larval exuviae ; b, 

 secretionary portion with hinge-like structure. 



with the exuviae central or subcentral. In Chionaspis 

 (Fig. 6) and Mi/tilaspis (Fig. 7) it is extended back- 

 wards, and the larval exuviae is terminal. In Aspidio- 

 tus, Gymnaspis, Mijtilaspis, etc., it is of a coriaceous or 

 horny substance ; while in Chionaspis, Diaspis, and 

 other genera it is white and of a felted nature (Fig. 6). 



