454 Annals of the South African Museum. 



Localities. — Mr. Purcell and Mr. Lightfoot collected about 25 ex. 

 in fresh-water ponds near Eetreat Vlei (Oct., 1900) (Eeg. No. 9038), 

 and 2 ex. in brack ponds at Zeekoe Vlei, Cape Flats (March, 1900). 



II. Family HYDRYPHANTIDiE (Piersig, 1896) (24). 



III. Gen. DIPLODONTUS Duges, 1834 (6). 



6. DiPLODONTus DESPiciENs (Mliller, 1776) (1, 2). 

 Locality. — This mite seems to be very common in the Cape 

 Peninsula. Mr. Purcell collected 2 ex. in a fresh-water pond at 

 Befgvliet Farm in the Constantia Area (May, 1896) (Eeg. No. 4588), 

 and 69 ex. in fresh-water ponds between Zeekoe Vlei and Eetreat 

 Station, Cape Flats (March, 1900) (Eeg. No. 4628). Mr. Lightfoot 

 and Mr. Purcell also collected 13 ex. in Eetreat Vlei (fresh water). 

 Cape Flats (April, 1900) (Eeg. No. 4629). 



III. Family LEBERTIIDiE Sig Thor, 1900 (30). 



IV. Gen. OXUS Kramer, 1877 (13, 14). 



7. Oxus STUHLMANNi (Koenike, 1895) (20). 

 Locality. — Mr. Purcell collected 2 ex. in fresh-water ponds 

 between Zeekoe Vlei and Eetreat Station, Cape Flats (March, 1900) 

 (Eeg. No. 4625). 



IV. Family LIMNESIID^ Sig Thor, 1900 (30). 



V. Gen. LIMNESIA Koch, 1835 (7). 



8. LiMNESIA AFRICANA g^ ? , U. Sp. 



Plate XIX., figs. 23-26. 



This new species is very similar in structure to Limnesia unclulata 

 (Miiller, 1776) (2), and may easily be mistaken, at first sight, for this 

 species. It differs, however, in several details, and is smaller than 

 L. undulata (Mliller). 



Length of body, 3" 0-56-0-8 mm. 



Width „ 3- 0-4-0-6 mm. 



Length ,, ? 0-8-1-0 mm. 



"Width „ 2 0-7-0-8 mm. 



Maxillary Organs. — The palps (figs. 23 and 24) are relatively 

 short and thick. The peg on the second segment, especially the 



