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TEXT-BOOK OF ENTOMOLOGY 



observes the following means of preserving cleanliness. The food 

 given to the larva, especially during the latter part of the growing 



FIG. 574. Cocciuellid larva infested by Ho ma lot yl us obgcuru-s, enlarged. 



period, contains much pollen, the cases of the grains of which 

 consist of cellulose, which is indigestible. 



u These cases, with other refuse matters, collect in quantity within the bowel, 

 which becomes distended, since it has no opening. The imprisoned larva, having 



FIG. 575. Cocoon of Praon under the body of a dead Aphis, enlarged. This and Figs. 573 and 

 574 after Howard, from Insect Life. 



little more than enough room for turning, must be freed of these objectionable 

 residua. ... In a word, the larva turns its head upon its stomach, and pushes 



Flo. 576. Pupation of Prootofnipes in flip body of a larva of a beetle, representing a case 

 mentioned by Dr. Sharp, where the parasites have pupated on the outside of the host, a pair ot'eaeh 

 attached to nearly each .-eminent of the body of their host. After Sharp. 



the former towards the base of the cell until its position is reversed, the tail 

 being outwards ; and, thus placed, it laps up all residue of food, especially from 



