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A CONTRIBUTION TO THE LIST OF HYDRACHNIDAE 

 FOUND IN THE EAST AFRICAN LAKES. 



By Charles D. Soar, F.R.M.S. 



{Bead Oetoler 2Wt, 1010.) 



The material on which this paper is based was placed in my 

 hfj-nds for examination, in the spring of this year, by Mr. 

 0. F. Rousselet, F.R.M.S. It consists of three tubes containing 

 I Fydrachnids collected daring the third Tanganyika Expedition, 

 conducted by Dr. W. A. Cunnington, F.Z.S., 1904-5. Each 

 tube represents the collection made from one of the three 

 great lakes: (1) Victoria Nyanza, (2) Nyassa, (3) Tanganyika. 

 This is not the only record from East Africa, as Dr. Koenike, 

 of Bremen, Mr. Halbert, of Dublin, and Dr. Daday, of Budapest, 

 have all recorded water-mites from the same great lakes ; those 

 described by Mr. Halbert (2) having been found by the above 

 expedition in Lake Tanganyika. A complete list of the 

 Hydrachnidae from these lakes, as at present known, is added 

 at the end of this paper. 



The collection from Victoria Xyanza (Tube No. 1) contained 

 only one species I was able to identify [Unionicida figuralis 

 Koch.) ; the remaining specimens were in bad condition and 

 immature. 



From Lake Tanganyika. (Tube No. 2.) 



Diplodontus despiciens Mull. 



Two nymphs of this mite were found in the tube. The colour 

 was entirely gone ; in life they Avere no doubt the usual re,d 

 colour. I have found a number of yellow-coloured mites of this 

 species in Suffolk, which I think is very rare, as I have not found 

 them elsewhere. The colouring of the soft-bodied mites is always 



