XX 



CONTENTS 



CHAPTEB PAGE 



VI. A Tour of Investigation among the Northern 



Islands . . . . . .94 



A number of islands compared as to their fauna 



VII. Mammals . . . . . .126 



Monkeys — Hippos — Situtunga — Otters — Bats — 

 Mongoose 



VIII. Birds 145 



IX. Eeptiles and Fish ..... 180 



X. The Colouration of Insects . . . 195 



Procryptic — Anticryptic — Aposematic — Directive 

 marks — The habit of grouping together more 

 common in aposematic than procryptic species 

 — Enemies of protected insects — Sexual colouring 

 and coiu-tship of butterflies — Mimicry, Batesian 

 and Mullerian — Do birds eat btatterflies ? — Longley's 

 revised hypothesis of mimicry 



XI. FSEUDACRAEA EURYTUS .... 242 



Some of its forms and varieties and their bearing 

 on the interpretation of mimicry by natural 

 selection 



XII. Hymenopteea ..... 276 



Ants — Wasps — Fossors or Sand-wasps — Bees 



XIII. Sundry Insects ..... 305 



Beetles — Di-agon-flies — Montispa — Mantidae — 

 Grasshoppers — Cockroaches — Earwigs — Flies — 

 Spiders — Myriapods — Crustacea — Molluscs 



