534 



MB. J. N. HALBERT ON THE HYDRACHNIDA [May 15, 



1. Zoological Results of the Third Tanganyika Expedition, 

 conducted by Dr. "W. A. Cunnington, 1904-1905. 

 Report on the Hydrachnida, By J. N. Halbert, 

 Dublin Museum *, 



[Received March 9, 1906.] 



(Text-figure 94.) 



The Water Mites collected by Dr. W. A. Cunnington were 

 taken in Lake Nyasa and are referable to two species, which 

 have been described by Dr. F. Koenike in his papers on the 

 Hydrachnida of Madagascar and East Africa. 



Encentridophorus spinifek (Koen.). 



Two of the three specimens of Hydrachnida collected at Nyasa 

 are to be refei-red to this species. Dr. Koenike includes it in the 



Text-fig. 94. 



A. Dorsal view of Arrlienurus plenipalpis, Koen. (legs and palps not drawn). 



B. End segnaent of fourth pair of legs oi JEiicentridophorus spinifer (Koen.). 



genus Atax {1); but Piersig makes a new genus Encentridophorus 

 for its reception (2), chiefly on account of the peculiar spine which 

 replaces the claws on the end segment of the fourth pair of le^s 



* Communicated by Dr. W. T. Calman, P.Z.S. 



