CH. XV.] SPECIES OP DIPTEROUS INSECTS. 225 



reus ; but the larvae, instead of being coiled up in a 

 spiral direction, were found to be arranged longi- 

 tudinally, without much order, being merely laid 

 parallel to each other. 



There are, however, some species of fleshflies, 

 su<;h as Musca vomitoria, or the great blue-bottlefly, 

 in which this mode of production does not take 



4. 



3. 



5. 



1. 



2. 



I, 2, 3. The Abdomen of the Blue Fleshfly opened, and seen 

 in different positions, to show the arrangement of the en 

 closed Eges. 



4. Portion of the Membrane in which the Eggs are enclosed. 



6. The same extended. 



