X CONTENTS 



Page 

 Photogenic Organs — Subesophageal Body — Head Glands in Apterygota — 

 Reproductive Organs. 



CHAPTER X 



POLYEMBRYONY AND PARTHENOGENESIS 130 



CHAPTER XI 

 Microorganisms in the Egg 138 



CHAPTER XII 



Experimental Embryology 144 



Determination — Experimental Materials and Methods — Nuclear Move- 

 ments in Cleavage and Blastoderm Formation — Indeterminate-determinate 

 Series — Developmental Centers — Anlagen Plan of the Embryo — Organ 

 Formation — Hallez's Law of Orientation. 



PART II 



CHAPTER XIII 



Oligoentomata and Aptilota 165 



Collembola, the Springtail {Isotoma cinerea)— Diplura, {Campodea staphy- 

 linus) — Thysanura, the Silverfish {Lepisma saccharina). 



CHAPTER XIV 

 Ephemerida, Odonata, Plecoptera, Embiaria, Dermaptera, Hemimerina . 191 

 Ephemerida, the May Fly {Ephemera vulgata) — Odonata, Dragonflies and 

 Damsel Flies — Plecoptera, the Stone Fly (Pteronarcys proteus) — Embiidina 

 (Embia uhrichi) — Dermaptera, the Earwig (Forficula auricularia) — Hemi- 

 merina {Hemimerus talpoides). 



CHAPTER XV 



Orthopteroidea (Panorthoptera) 211 



Mantaria, the Praying Mantis {Paratenodera sinensis) — Blattaria, the 

 Croton Bug (Blattella germanica) — Isoptera, the Termite (Eutermes rippertii) 

 — Phasmataria, the Walking Stick {Carausius morosus) — Caelifera, the 

 African Migratory Locust {Locusta migratoria migratorioides R.F.), the 

 Differential Locust {Melanoplus differentialis). 



CHAPTER XVI 



Oligonephridia 248 



Copeognatha, a Viviparous Psocid {Archipsocus fernandi) — Siphunculata 

 (Sucking Lice), the Head Louse (Pediculus humanus capitis) — Mallophaga 

 (Biting Lice), the Pigeon Louse (Lipeurus baculus), the Guinea-pig Louse 

 {Gyropus ovalis) — Thysanoptera, Thrips (Thrips physapus) — Homoptera 

 (Aphididae and Siphanta acuta) — Heteroptera, the Milkweed Bug {Oncopel- 

 tus fasciatus), the Fire Bug {Pyrrhocoris apterus), a Polyctenid {Hesper- 

 octenes fumarius). 



CHAPTER XVII 



Neuroptera and Coleoptera 28o 



Neuroptera, the Alder Fly (Sialis lutaria), the Pearl-eye (Chrysopa perla) — 

 Coleoptera, Stylops and the Alfalfa Snouth Beetle (Brachyrhinus Hgustid). 



