330 Acarology 



Frequently with well-developed sexual dimorphism; inner propo- 

 dosomal setae shorter than outer; legs stout, the setae in many 

 cases being modified as stout spines; microsense and macrosense 

 setae arising from same base Rhizoglyphinae 



Nesbitt 1950 has placed the Pontoppidanidae as a subfamily of the 

 Acaridae and separates them thus: 



Nuchal setae thin, rootlike structures adhering closely against the 

 lateral wall of the body Acarinae 



Nuchal setae distinct hornlike processes standing free of body 



Rhizoglyphinae 



Nuchal setae distinct, heavily pectinated processes standing free 

 of body and readily visible in dorsal mounts Pontoppidaniinae 



Acarinae Nesbitt, 1945 



Genera and subgenera: 



1. ^c«ri^5 Linnaeus, 1758 (= T>^ro^/);/7/iM5 Latreille, 1796) 

 Type. Accirus siro Linnaeus, 1758 



2. Aleuroglyphus Zakhvatkin, 1940 



Type. Tyroglyphus ovatus Troupeau, 1879 



3. Ebertia Oudemans, 1924 



Type. Tyroglyphus australis Oudemans, 1917 



4. Podoglyphus Oudemans, 1937 



Type. Glyciphagiis biiski Murray, 1877 



5. Tyrolichus Oudemans, 1924 



Type. Tyrolichus ccisei Oudemans, 1910 



6. Tyrophagus Oudemans, 1924 {— Coelognathus v. Heffling, 1852) 



a. Tyrophagus s. str. 



Type. Acarus putrescentiae Schrank, 1781 



b. Tyroborus Oudemans, 1924 



Type. Tyroborus lini Oudemans, 1924 



c. Povelsenia Oudemans, 1924 



Type. Tyroglyphus neotropicus Oudemans, 1917 



Rhizoglyphinae Zakhvatkin, 1941 



Genera and subgenera: 



1. Rhizoglyphus Claparede, 1869 



Type. Tyroglyphus echinopus Fumouze and Robin, 1868 



2. Caloglyphus Berlese, 1923 (? = AcJiropodophorus Rosas Costa, 



1927) 

 Subgenera of Caloglyphus after Vitzthum 



