CONTENTS , V 



PAGE 



The United States National Museum collection - - - 164 



Neotettix bolivari longipennis — Neotettix coarctatus — Neotettix vari- 

 abilis described .-.-..- 165 

 Vivarium experiments — Method — Observations of Tettigids — Habits 167 



Hatching Tettix ornatus — Ecdysis - ... - 168 



Number of eggs thirteen and twelve — Eggs in the advanced stage 

 of incubation — Weakness of Males — Third ecdysis — Ornatus lay- 

 ing in June and July — Fifteen days' incubation - - i6q 



A specimen lives from May to August in vivarium — Ornatus hatched 

 in June matures August 14 — Ornatus and triangularis the same 

 species — Oviposition — Male stays on the female's back — Eggs 

 shallowly deposited - - - - - - - 170 



Hatching ornatus — Time of pigmentation - - - - 171 



Summary of how eggs are laid — Protective resemblance of the eggs 

 to lichens or moss — Expulsion of faces by means of hind tibia 

 — Hatching of ornatus — Time perfectly maintained in develop- 

 ment of embryos — Hatching simultaneously after twenty-three 

 days — Handling young in transferring to another vivarium - 172 



Number of larvse in each brood — Tliirteen larva; the average — 

 Simultaneously emerging — Tettix ornatus brood of sixteen 

 hatched June i — Ovipositing — Eighteen minutes covering her 

 eggs - 173 



Twenty-three days' incubation in Tettix ornatus — How the larva 

 throws off the amnion — Appearance of the eggs just before 

 hatching — Tettix ornatus having but one leg covers her eggs - 174 



Tettix nine days old with reddish femora, protectively colored like 

 spore-heads of lichens — Three out of thirteen in same brood thus 

 marked — First ecdysis, tenth and eleventh days after birth — 

 Tettigids play in sunshine — Oviposition — Male active — Ends of 

 eggs visible in shallow hole ----- 175 



Oviposition of Tettix triangularis — Eleven eggs laid — How the 

 eggs are covered— Color of newly laid eggs pinkish white — Tettix 

 ornatus covers her eggs — Oviposition last of June — Tettix tri- 

 angularis ovipositing last of June — Second or third ovipositing 

 — Method of covering her eggs ----- 176 



Tettix triangularis ovipositing last of June — Living two months in 

 vivarium — Larvs found in June undergone three molts — Ex- 

 perimental evidence of polyandry suggesting the transmission 

 of many lines of descent through the male - - - 177 



A brood of twenty-four Tettigidea parvipennis hatches — Pigmen- 

 tation acquired in fifty minutes — Tettigidea parvipennis eigh- 

 teen-days' incubation — Sexes remain together three days — Ovi- 

 positing — Male seeks female afterwards— Twelve eggs laid — 

 Time of incubation in parvipennis eighteen days - - - 178 



Incubation twenty days — Increased heat shortening period of incu- 

 bation in June — Hatching in July — Parvipennis hatched July 5 

 matures August 27, 28, and 29 — Spermatozoa live long within 

 the body of the female — Forty-five eggs laid by parvipennis in 

 three consecutive periods — First twenty-one, second seven, 

 third seventeen eggs - - - - - - - 179 



