I 



Hydrachnellae 301 



16. Thonia Halik, 1941 



Type. Thonia harbata Halik, 1941 



17. Thoracohygrobates Lundblad, 1936 



Type. Thoracohygrobates cancellatus Lundblad, 1936 



INIegapusinae Thor, 1927 



Genera and subgenera: 



1. M^^fl/7M5 Neumann, 1880 



a. Megapus s. str. 



Type. Atractides spinipes Koch, 1837 



b. Octomegapus Viets, 1926 



Type, Megapus octoporus Piersig, 1904 



c. Poly megapus Viets, 1926 



Type. Megapus polyporus Viets, 1922 



d. Tetramegapus Viets, 1926 



Type. Megapus gabretae Thon, 1901 



e. Tympanomegapus Thor, 1923 



Type. Atractides pavesii Maglio, 1905 



2. Hygrobatomegapus Lundblad, 1927 



Type. Hygrobatomegapus spathuliferus Lundblad, 1927 



3. Megapella Lundblad, 1936 



Type. Megapella longimaxillaris Lundblad, 1936 



4. Megapoides Lundblad, 1936 



Type. Megapoides porosus Lundblad, 1936 



5. Mesobatella Nitis, i9^i 



Type. Megapus serratisetus Viets, 1916 



6. Mesobates Thov, 1901 



Type. Mesobates forcipatus Thor, 1901 



7. Mixobates Thov, 1905 



Type. Mixobates processifer Thor, 1905 



Atractidellidae Lundblad, 1936 



Figures 2^0-233 



Diagnosis: With shields on the anterior dorsum, the body of these 

 mites is strongly skinned. The chelicerae are long and slender and the 

 palpal femur and genu each have a ventral spine. The coxal plates he 

 in three groups; the two anterior pairs of plates are united behind the 

 maxillary organ, coxal plate iv has a sclerotized posterior margin which 

 is drawn out into a hooklike projection, and the anterior portion of 

 coxal plates i surpasses the edge of the body. The legs are long and 



