xiv CONTENTS 



CHAPTER XXII 



STONE-FLIES, MAY-FLIES, DRAGON-FLIES, ANT-LIONS, 

 SCORPION-FLIES, CADDIS-FLIES 



PAGES 



Predatory Aquatic Larvje of Perla, ol Ephemerida, oiAgrionince, 

 ' of Alder-fly, and of Caddis-fly. Ant-lions, Mantis-flies, 

 Aphis-lions, Scorpion-flies ..... 256-262 



CHAPTER XXIII 



THE CLASS ARACHNIDA, AND THE ORDER ACARINA 



Structure and Classification of Arachnida. Mites and Ticks : 



Synopsis of Principal Families .... 263-268 



CHAPTER XXIV 



ORDER ACARINA (conthtued) : THE TICKS 



Structure and Classification of Ixodidae. The Subfamily 

 IxodiruB : Synopsis and Diagnosis of Genera. The Sub- 

 family Argantince : Synopsis of Genera and Species : 

 InvportaxA S'pcaf:s of Omitkodorus axid. Argas . . 269-285 



CHAPTER XXV 



ORDER ACARINA {concludect) : THE MITES 



Gmnasidcs, Uropodidce, Trombidiidce. Harvest Mites. Itch- 

 Mange-, and Scab-mites. Cheese- and Flour-mites. 

 Hypopus Stage of Mites. DemodicidcB. Other Families of 

 Mites ........ 286-293 



CHAPTER XXVI 



SCORPIONS, SPIDERS, ETC. 



Scorpions : Sting and Venom : Classification and Distribution. 

 Spiders: Spider-venom: Lathrodectus. SoHfuga, "Jerry- 

 munglums" 294.301 



