South African Hydrachnids. 455 



basal part, is short. On the flexor side of the fourth segment 

 are 2 (or 3) thick teeth (papillae), like those on the palps of 

 species of the genus Curvipes, whereas L. undidata (Miiller) has 

 only rudiments of papillae for the insertion of the hairs. Similar 

 palpal papillas are found on the fourth segment of Limnesia aspera 

 Koenike, 1898 (23), but the structure of the skin, of the epimeral 

 and genital area, &c., prohibit an identification with this species. The 

 mandibles and the maxillary lip do not show remarkable differences. 



The epimera (fig. 25) are characterised by having the fourth 

 epimeron very short and rounded at the hinder end. The usual 

 pores occur in the inner end of the third and fourth epimeron. 



Genital Organs. — The genital area has the typical Limnesia form. 

 The ^ (fig. 25) has the genital plates coalesced anteriorly and 

 posteriorly. The principal characteristic is the position of the 

 second (middle) genital disc {acetahulum), which in both g and ? 

 is very near the third posterior disc (figs. 25 and 26). Several small 

 hair-pores also occur. 



The skin-pores at the sides of the genital area and the " anus " 

 have the usual shape and positions. 



Locality. — Mr. Purcell collected 2 ? in Eetreat Vlei (fresh water), 

 Cape Mats (Oct., 1900) (Reg. No. 4630), 10 ex. (6 <? , 4 ? ) in brack- 

 water ponds at Zeekoe Vlei, Cape Plats, near Cape Town (March, 

 1900) (Reg. No. 4621), and 1 2 in a fresh-water pond between 

 Zeekoe Vlei and Retreat Station (March, 1900). 



V. Family HYGROBATIDiE Koch, 1842 (8). 



VI. Gen. CAPOBATES Sig Thor, 1898 (26, 27). 



9. Capobates sarsi Sig Thor, 1898. 

 Locality. — Mr. Purcell collected 1 ? at Bergvliet Farm in the 

 Constantia Area, near Capetown (May, 1896) (Reg. No. 4587) and 

 a few nymphs in fresh-water ponds between Zeekoe Vlei and Retreat 

 Station (March, 1900). 



VI. Family CURVIPEDID^ Sig Thor, 1900 (30). 



VII. Gen. curvipes Koenike, 1891 (19). 



10. Curvipes coccineus ? (Koch), 1836 ; Berlese, 1882 ; 

 Sig Thor, 1897 (7, 17, 25). 

 Locality. — Mr. Purcell collected 10 ? in fresh-water ponds 



