Breed. — Muscle Metamorphosis, 



PLATE 7. 



Fig. 33. Longitudinal section of a functional muscle fibre. Feeding lari^a. X 800. 



Fig. 34. Longitudinal section of the largest of the fibres of musculus metanoti. 

 Taken from a resting larva. X 800. 



Fig. 35. Longitudinal section of a portion of musculus metanoti. Taken from an 

 old pupa, X 800. 



Fig. 86. Longitudinal section of a part of flexor coxae metathoracis secundus. 

 Drawn from an imago. X 800. 



Fig. 37. Longitudinal section of one of the degenerating larval muscles of the dor- 

 sal antero-posterior group in the mesothorax. Drawn from a young 

 pupa. X 800. 



Fig. 38. Remains of the degenerating larval muscles e, t} (see Fig. 1). Drawn 

 from an old pupa. X 800. 



Fig. 39. Cross section of the degenerating larval muscles e, -q. Drawn from a 

 young pupa. X 800. 



Figs. 40-48. Leucocytes containing foreign bodies, all of them being taken from 

 old pupae. X 1600. 



Fig. 49. Cross section of flexor alae metathoracis secundus. Drawn from a rest- 

 ing larva. X 800. 



Fig. 50. Cross section of the same muscle in the imago. X 800. 



Fig. 51. Cross section of a part of the wall of the proventriculus of a larva about 

 to pupate. X I'iOO. 



Fig. 52. Dorsal part of a cross section of the proventriculus of an old pupa. 

 Ventral is uppermost on the plate. X 1200. 



