Hydrachnellae 277 



the genital plates are fused medianly and have numerous small genital 

 suckers. 



Genera and subgenera: 



1. Hydrachna Miiller, 1776 (= Atax Fabricius, 1805) 



a. Hydrachna s. str. (= Diplohy drachma Thor, 1916) 

 Type. Hydrachna cruenta Miiller, 1776 



b. Anohydrachna Thor, 1916 



Type. Hydrachna perniformis Koenike, 1895 



c. Chitohydrachna Habeeb, 1950 



Type. Hydrachna {Chitohydrachna) ennishonenses Habeeb, 1950 



d. MonohydrachnaThoT, 1916 



Type. Hydrachna cruenta Krendowsky, 1884 



e. Rhabdohydrachna \iets, 1913 



Type. Hydrachna bisignifera Viets, 1913 



f. Schizohydrachna Thor, 1916 



Type. Hydrachna uniscutata Thor, 1897 



g. Scutohydrachna Viets, 1933 



Type. Hydrachna {Scutohydrachna) dorsoscutata Viets, 1933 

 h. Tetrahydrachna Lundblad, 1934 



Type. Hydrachna globoso var. miliaria Berlese, 1888 



2. Bargena Koenike, 1893 



Type. Bargena mirifica Koenike, 1893 



Limnocharidae Kramer, 1877 



Figures 193-196 



Diagnosis: Red, nonswimming mites found in standing and slo\^ 

 moving water, the limnocharids are weak-skinned. Eye capsules which 



Figure 193 Limnochares (Cyclothrix) 

 nutans Lavers. Leg iv. (After Lavers 

 1941) 



Figure 194 Limnochares {Cyclothrix) 

 natans Lavers. Eye plate. (After 

 Lavers 1941) 



