450 Annals of the South African Museum. 



The mandibles (fig. 7) are relatively narrow, with obtuse, inner, 

 basal process (fig. 7, st). 



The maxillary ])alps furnish us here also with a good character 

 for distinguishing the species. The structure is, on the whole, quite 

 normal. The lengths of the five segments (reckoning from the first 

 to the fifth) are : 0-15 + 0-2 + 0-2 + 04 + 0-2 mm. The third segment 

 has only a small, inner, distal dilatation with 4 very short spines. 

 The fourth segment possesses on the outer side only 3 long dagger 

 spines in a row and 1 at the distal end near the dorsal side ; on 

 the inner side are 10 spines, viz., 3 thick dagger spines, 5 short 

 feathered ones, and 2 long ones near the dorsal side. 



The other organs do not show remarkable differences. 



Locality. — Mr. Lightfoot and Mr. Purcell collected about 20 ex. 

 in fresh-water ponds near Eetreat Vlei (Oct., 1900) (Eeg. No. 9034), 

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

 No. 9035). 



3. EULAIS VAEIABILIS U. sp. 



Plates XVI., XVII., figs. 9-15. 



Length of body about 2-3 mm. 



Width ,, ,, 2-2-5 mm. 



Length of maxillary palps about O'9-l mm. 



Length of leg I about 1'6 mm. 

 ,, ,, II ,, 2-0 mm. 



,, ,, III ,, 2-1 mm. 



,, ,, IV ,, 2-5 mm. 



I have found many variations in this mite, and have, therefore^ 

 delineated several eye-plates. It is possible that later on one will 

 have to distinguish two or more species, but at present I can only 

 look upon them as varieties of one form. Several transitional forms 

 are also met with. 



The general appearance of the mite is the ordinary one, the 

 characteristic differences lying in the form of the eye-plates and the 

 maxillary organs. Some of its characters place it in the neighbour- 

 hood of E. lightfooti n. sp., and E. degenerata Koenike, 1897 

 (22, 23). 



Eyes. — The typical eye-]3lates (fig. 9) resemble in shape those of 

 E. mulleri Koenike, 1897 (22), and E. dividuus Soar, 1901 (34). 

 The eye-bridge is broad, with the hind margin in almost a straight 

 line and at right angles to the eye-capsules. The muscle-peg is 

 broad, rounded, and directed forwards towards the rounded incision 



