LIST OF PLATES. 



TO FACE 



II.ATE p^^^g 



I. The Alimentary 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 Dlscs of the Resting Larva— First Stage 80 

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



VI. The Proboscls of the Imago . . . . 130 



VI I. 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 Blow-P'ly . - . - - 216 



XII. Embryology ------- 232 



XIII. Embryology . - - - . . 242 



XIV. Embryo — Early Stage - - ... 250 

 XV. Embryo — Late Stage ------ 258 



XVI. Histology - - . - . . . 266 



XVII. Histology .---..- 284 



X\TII. Histolysis -.-...- 302 



XIX. Pronymph - - - - - - 316 



XX. Pronymph and Nymph - - . . . 318 



XXI. Nymph -------- 342 



