Chapter VI page 259 



Hydrachnellae Latreille, 1802 



Halacaridae Murray, 1876 



Hydrovolziidae Thor, 1905 



Rhynchohydracaridae 



Lundblad, 1936 



Hydrachnidae Leach, 1815 



Limnocharidae Kramer, 1877 



Eylaidae Leach, 1815 



Protziidae Viets, 1926 



Hydrodromidae Viets, 1936 



Hydryphantidae Thor, 1900 



Clathrosperchonidae 



Lundblad, 1936 



Ctenothyasidae Lundblad, 1936 



Thermacaridae Sokolow, 1927 



Rutripalpidae Sokolow, 1934 



Mamersopsidae Lundblad, 1930 



Pseudohydryphantidae 



Viets, 1926 



Teutoniidae Lundblad, 1927 



Sperchonidae Thor, 1900 



Anisitsiellidae Viets, 1929 



269 



274 



275 

 276 

 277 

 279 

 280 

 281 

 282 



284 

 285 

 286 



287 

 288 



289 

 289 

 290 

 291 



Lebertiidae Thor, 1900 293 



Atractideidae Thor, 1902 294 



Pontarachnidae Thor, 1929 295 



Neotorrenticolidae 



Lundblad, 1936 296 



Limnesiidae Thor, 1900 297 



Hygrobatidae Koch, 1842 299 



Atractidellidae Lundblad, 1936 301 



Nautarachnidae Viets, 1935 303 



Feltriidae Thor, 1929 303 



Unionicolidae Oudemans, 1909 304 



Pionidae Thor, 1900 307 



Astacocrotonidae Thor, 1927 309 



Axonopsidae Viets, 1929 310 



Mideidae Viets, 1929 313 



Mideopsidae Thor, 1938 314 



Acalyptonotidae Walter, 1911 315 



A-Thienemanniidae 



Lundblad, 1930 316 



Eupatrellidae Viets, 1935 317 



Arrenuridae Thor, 1 900 317 



Krendowskiidae Lundblad, 1930 318 



Chapter VII page 320 



The Suborder Sarcoptifornies Renter, 1909 



Acaridiae Latreille, 1802 320 



Pediculochelidae 



Lavoipierre, 1946 325 



Saproglyphidae Oudemans, 1924 326 



Acaridae 



Ewing and Nesbitt, 1942 327 



Forcelliniidae Oudemans, 1927 337 



HyadesidaeHalbert, 1915 339 



Carpoglyphidae Oudemans, 1923 340 



Oulenziidae Oudemans, 1928 342 



Ensliniellidae Vitzthum, 1928 343 



Czenspinskiidae Oudemans, 1927 344 



Xll 



