TABLE OF CONTENTS IX 



CHAPTER X 



PAGE 



Other Insects that Transmit Disease Germs ... 98 

 Fleas and bubonic plague (98). Control of plague in San 

 Francisco (98). Blood-sucking flies and disease (99). Bed- 

 bug and disease (100). Sucking lice and disease (100). 



CHAPTER XI 

 Classification in General and of Insects in Particular . 102 

 Artificial classification (102). Natural classification (102). 

 Structure and life histories in classification (103). System of 

 classification used by scientists (103). Reasons for existence 

 of classification (105). Value of classification (106). Necessity 

 of scientific terms (106). Classification of insects (107). 



CHAPTER XII 

 Spiders and Other Arachnids . . . . . .111 



Where spiders live (in). Spiders with and without webs 

 (in). Types of webs (in). How webs are built (113). 

 Spinning organs (113). How insects are captured (114). 

 Sense organs (114). Respiration (114). Reproduction (114). 

 Aerial spiders (115). Water spiders (116). Trapdoor spider 

 (117). Tarantulas (117). Spider bites (118). Harvestmen 

 (118). Scorpions (118). Mites and ticks (119). King crab 

 (119). Characteristics and classification of Arachnida (1 19") . 



CHAPTER XIII 



The Relations of Arachnids to Man 121 



Arachnids destroy insects (121)- Spider silk (121). 

 Mites and ticks (121). Texas-fever tick (121). Chicken 

 mites (124). Fowl ticks (124). Mites which cause scab and 

 mange (125). Itch mite (125). Harvest mites or jiggers 

 (125). Face mites (126). Spotted-fever tick (126). "Red 

 spiders" on plants (126). Gall mites (127). 



CHAPTER XIV 

 The Myriapoda or Centipedes and Millipedes . . .128 

 Millipedes (128). Centipedes (128). Characteristics and 

 classification (129). 



