572 



DR. W. A. CUNNIxVQTON ON THE 



Hydiiachnida. 



It is probable that the Hydiuchnida of the great African lakes 

 are but imperfectly known to science, although 31 species in all 

 have been enumerated. Comparatively small and inconspicuous 

 forms as these mites are, there seems little doubt that a good 

 many more species will come to light in the future. Following 

 on the earliest collections made by Stuhlmann, come those of 

 Fiilleborn in and around Nyasa and of Borgert in Victoria 

 Xyanza. Specimens from both those lakes and also from Tan- 

 ganyika were obtained by the expedition which I conducted 

 in 1904-05. It seems likely that Like Nyasa, from which 

 the largest number of types (14) is on record, has been better 

 explored in this direction than the remaining lakes. No 

 Hydrachnids have hitherto been collected in either Albert 

 Nyanza or Kivu. 



Table of Distribution of Hydrachnida t. 



Naint3 of Species. 



Tangaii- Victoria 

 yika. Nyanza. 



Nyasi 



Edward 

 Nyauza. 



Other parts of 

 the world. 



Family Hydeophantidje. 



Georgella incerta 



Diplodontus despiciens P 



Family Hygrobatid^e. 



Liinnesia armata 



„ caiupanulata 



Auisitsiella africaua 



Hygrobates edeiitipalpis E 



Oxus stulilmanni 



Uniouicula borgerti 



„ crassipes 



„ digitatus 



„ falcifer 



„ tiguralis P 



„ lynceus 



,, cuiiningtoni 



Eucentridophorus borgerti 



„ koenikei ... 



„ spinifer ... 



Neumauia paucipora 



„ simulaiis 



„ spinipes 



„ papillosa E 



Koenikea tessellata 



Piona caligifera 



„ rotundas 



Forelia liliacea P 



Mideopsis minuta E 



Arrhenurus plenipalpis 



„ sarcinatus 



„ tteuiatus 



„ vigorans 



„ voeltzkowi ^ 



14 genera 6 P. 



31 species 3 E, 3P. 



(6) 



Quilimane, Nossi-Be. 

 Cosinopolitau. 



E§ 



Europe. 

 Nossi-Be. 



Europe. 



Zanzibar. 

 East Africa. 

 Soudan, Quilimane. 

 Europe. 



Madagascar. 



Europe. 



Europe. 



Madagascar, Quilimane. 

 Madagascar. 



Nossi-Be. 



Madagascar, E. Africa. 



6P 



8 P. 



IP 



6E, 6P. 



(12) 



5E, 9P. 

 (14) 



IE. 



t For additional information refer to Daday (76, p. 237) and Soar (172). 



§ Not actually recorded from the lake itself, but from within its drainag:e area. 



