LIST OF PLATES: 
TO FACE 
PLATE PAGE 
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 
DOMES IS) + 5) “A - - - - 454 
DOG. a5 3 ry . - . - - 456 
XXXI._,, 9 F A - - - - 458 
XXXII. ,, Fr a H - - - - 460 
XXXIIl._,, in ¥ * - - : - 462 
XXXIV. THE NEUROBLAST OF THE RESTING LARVA © - - 484 
XXXV. THE COMPOUND EYE - - - - - 516 
SEKVIS, oy a - - - - - 518 
XXXVII. THE Opric 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 
