CONTENTS 



CHAPTER PAGE 



XV. — Aquatic Insects (Ltsecta) . . . .179 



Structure of insects — How insects grow — Key 

 to orders of insects — -Springtails {Collembola) 

 — Stoneflies {Plecoptera) — Mayflies (Ephe- 

 merida) — Dragonflies and Damselflies (Odo- 

 nata) — Water-bugs {Hemiptera) — Alderflies, 

 dobsons, and Fish-flies (Neuroptera) — Cad- 

 dis flies {Trichoptera) — Moths {Lepidoptera) 

 — Beetles (Coleoptera) — Flies (Diptera). 



XVI. — Snails and Mussels (Mollusca) . .301 



Habits and importance — Snails, form and 

 habits — Eggs — Common species — Mussels, 

 form and habits — Eggs and young — Com- 

 mon species. 



XVII. — Lampreys and Fishes .... 324 



Form and habits — Breeding habits — Lamp- 

 reys — Common brook and pond fishes. 



XVIII. — Salamanders, Frogs, and Toads, Found in 



OR Near Water (Amphibia) . . . 347 



Form and habits — Food — Breeding habits 

 and life history — Common salamanders, 

 frogs, and toads. 



XIX. — Turtles and Snakes, Found in or Near 



Water {Reptilia) ..... 389 



Form and habits — Breeding habits — Common 

 water turtles and snakes. 



Bibliography ...... 407 



Glossary ..,.,. 425 



Index . . . . s s . 431 



xm 



