CONTENTS 



PAGE 



vii 



List of plates ..._... 



List of text illustrations ------- vii 



Introduction ---------! 



Origin of the name Tettix ------ 3 



Characters distinguishing the group ----- 4 



Distribution -------- 5 



Recent additions of Genera ...... (, 



Temperate forms compared — Dimorphism - - - - 7 



Researches to determine biological facts - - - - - 8 



Collecting — Distinguishing Tettigids from other orthoptera - 8 



Protective resemblance — Varieties of coloring - - - - q 



Habits — Hibernation ------- 10 



Food habits - - - - - - - - -11 



Oviposition — Variations in time of incubation — Number of eggs laid — 

 First eggs laid in May — The egg burrow — Provision for protect- 

 ing the eggs - - - - - - - 12 



Resemblance of eggs to leaves of polytrichum - - - - 13 



Clianging environment ------- 13 



Migratory habits -------- 14 



Sexes uniting in the spring— Length of time during conjugation — 

 Method of conjugation — Polyandry among the Tettigidae — Poly- 

 andry a factor in accounting for variations - - - 15 

 Sexual habits — Peculiar habit of shaking the body - - - 16 

 The male rides on the female's back ----- 17 



Spermatozoa of Tettigidea and Paratettix - - - - i? 



How the eggs are laid ------- 18 



Appearance of eggs ------- ig 



Hatching — Eggs split lengthwise— Shedding of the amnion — Accident 



to new born ------- 20 



Pigmentation - - - - - - - - 21 



Size of larva2 — Appearance of larvae after first ecdysis - - 21 



Pronotal changes -------- 21 



Appearance of the elytra — Differences between adults and larv;i; - 21 



Colors clearly marked - - - - - - - 22 



First ecdysis -------- 22 



Last ecdysis --------- 23 



Phylogeny suggested by the metamorphosis - - - - 24 



Enemies --------- 25 



External anatomy ------- 27 



The pronotum and other parts described - - - - 28 



Wings — Tracheation ------- 3° 



Variations in middle femora - - - ■ - - 32 



