Hydrachnellae 



281 



have button-like or acorn-like suckers posteriorly. The genital plates 

 are lacking or hair-bearing. 



Genera: 



1 . Protzia Piersig, 1 897 



Type. Thy as eximia Protz, 1896 



2. Calonyx Walter, 1907 



Type. Calonyx kitiis Walter, 1907 



3 . Neocalonyx Walter, 1919 



Type. Neocalonyx godeti Walter, 1919 



4. Partnunia Piersig, 1897 



Type. Thy as angusta Koenike, 1893 



5. Partnuniella Viets, \93S 



Type. Partnuniella thermalis Viets, 1938 



6. Fro^zzW/aLundblad, 1934 



Type. Protziella hutchinsoni Lundblad, 1934 



7. Wandesia Schechtel, 1912 



Type. Wandesia thori Schechtel, 1912 



Hydrodromidae Viets, 1936 



Figures 201, 202 



Diagnosis: The hydrodromids are red in color and have weak skin 

 with papillae. No dorsal shield is present. Lateral eyes are separated, 

 from one another and are not contained in capsules while a median 



Figure 201 Hydrodroma despiciens 

 (Miiller), Coxal and genital plates. 

 (After Lundblad 1944) 



Figure 202 Hydrodroma despiciens 

 (Miiller). Palpus. (After Lundblad 

 1944) 



eye is lacking. The coxal plates are divided in four groups of two each. 

 The legs usually have swimming hairs and the tarsal claws have small 

 outer accessory teeth. The palpal tibia has a long dorsal distal process 

 above the palpal tarsus. Genital plates with many suckers are present. 



