LIST OF PLATES. 



TO FACE 



PLATE 1'AGE 



XXII. THE SPIRACLES 360 



XXIII. DETAILS OF ORAL LOBES - - 394 



XXIV. THE ALIMENTARY CANAL OF THE IMAGO 408 

 XXV. THE DEVELOPMENT OF THE ALIMENTARY CANAL - 428 



XXVI. THE NERVOUS SYSTEM OF THE IMAGO - - 436 



XXVII. THE THORACIC GANGLION OF THE IMAGO 438 



XXVIII. THE BRAIN OF THE IMAGO 452 



XXIX. - 454 



XXX. ,, - 456 



XXXI. ., - 458 



XXXII. 460 



XXXIII. - 462 



XXXIV. THE NEUROBLAST OF THE RESTING LARVA - 484 

 XXXV. THE COMPOUND EYE 516 



XXXVI. 518 



XXXVII. THE OPTIC GANGLION OF THE PUPA - 544 



XXXVIII. DETAILS OF THE COMPOUND EYE - 548 



XXXIX. DEVELOPMENT OF THE RETINA 552 



XL. OPTIC DIAGRAMS - 580 



XLI. THE ANTENNA AND PALPUS 586 



XLII. THE HALTER ... . 604 



