Trombidiformes 213 



Paratetranychus and Metatetranychus spin weakly; and Bryobia, Pe- 

 trobia and Tetranycopsis do not spin. Grandjean 1948 believes the 

 silk glands to be in the palps, opening on the palpal thumb through 

 the broad, rounded, terminal "finger" or "spine." 



Genera: 



1. TetranychusT>uiouY, 1832 (= Epitetrany chus Zacher, 1916) 

 Type. Tetranychus lintearius Dufour, 1832 



2. AUochaetophora McGregor, 1950 



Type. AUochaetophora calif ornica McGregor, 1950 



3. Amphitetranychiis Oudemans, 1931 

 Type. Tetranychus viennensis Zacher, 1920 



4. AnatetranychusWoxnQYs\Qy, \940 



Type. Anatetranychus hakea Womersley, 1940 



5. Aplonobia Womersley, 1940 



Type. Aplonobia oxalis Womersley, 1940 



6. Apotetranychus OudQm2Lns, \93>l 



Type. Apotetranychus muscicola Oudemans, 1931 



7. Bryobia Koch, 1836 (= Schmiedleinia Oudemans, 1928) 

 Type. Bryobia praetiosa Koch, 1836 



8. Eotetranychus Oudemans, 1931 

 Type. Acarus telarius Linnaeus, 1758 



9. Eutetranychus Banks, 1917 (= Anychus McGregor, 1920) 

 Type. Tetranychus banksi McGregor, 1914 



10. Eury tetranychus Oudemans, 1931 



Type. Tetranychus latus Canestrini and Fanzago, 1876 



11. Hystrichonychus McGregor, 1950 



Type. Tetranychus gracilipes Banks, 1900 



12. Linotetranus^erXcse, \9\0 



Type. Linotetranus cylindricus Berlese, 1910 



13. Metatetranychus Oudemans, 1931 

 Type. Tetranychus ulmi Koch, 1836 



14. Monoceronychus McGregor, 1945 



Type. Monoceronychus californicus McGregor, 1945 



15. N eotetranychus Tragardh, 1915 



Type. N eotetranychus rubi Tragardh, 1915 



16. Oligonychus Berlese, 1886 (Oudemans 1938 states = Rhodaxes 



Kirchner, 1863) 

 Type. Tetranychus minimus Tdirgioni-TozzeXii, 1878 (= Oligonychus 

 brevipodus Berlese, 1886) 



17. Paratetranychus Zacher, 1913 



Type. Tetranychus ununguis Jacobi, 1905 



18. Petrobia Murray, 1877 (= Tetranobia Banks, 1917) 



