LIST OF PLATES. 



I. The Alimentaky Canal of the Larva - - 52 



II. The Nervous System of the Larva - - - 64 



III. The Nervous System of the Adult Larva - - 70 



IV. The Imaginal Discs of the Resting Larva— First Stage 80 

 V. The Cephalo-Thoracic Segments - - - - 112 



VI. The Proboscis 01- THE Imago ■ - -130 



VII. The Thorax of the Imago - - - - 168 



VIII. Details OF THE Thoracic Skeleton - - - 172 



IX. The Legs and Feet - - - - - 192' 



X. The Wings - - - - - - 200 



XI. Male Rlow-Fly - - - ■ 216 



XII. Embryology - - ■ - - - 232 



XIII. Embryology - - - - 242 



XIV. Embryo— Early Stage - - - 250 

 XV. Embryo— Late Stage - - - - 258 



XVI. Histology - - - - - - 266 



XVII. Histology - ■ - - 284 



XVIII. Histolysis - - - - 302 



XIX. Pronvmbh - - - - - 3>6 



XX. Pronymbh and Nymph - - - 318 



XXI. Nymph ---■-■- 342 



