South African Hydrachnids. 459 



The maxillary palps (figs. 38 and 39) have the extensor side of the 

 fourth segment provided with a saddle-Hke emargination, analogous 

 to that found in A. frustrator Koenike, 1898 (23), but the emargina- 

 tion is not so deep as in the latter species. The prehensile spine 

 (fig. 38, sp) is straight, very long, and situated far inwards from the 

 distal flexor corner of the fourth segment. The fifth segment (claw) 

 (fig. 38, cl) is large, cleft, and provided with a long hair in the 

 middle on the flexor side. The hairs on the antagonistic portion of 

 the fourth segment are inconspicuous. 



The legs are normal, the fourth pair having on the fourth segment 

 a large process or spur with 8 hairs at the apex (fig. 35, pr). 



The genital pore-plates are narrow, hke, for instance, those of the 

 3^ of A. biciispidator Berlese (17), but shorter ; the outer ends are 

 curved forwards. 



Locality. — Mr. Purcell collected 1 <? in a brack-water pond at 

 Zeekoe Vlei, Cape Plats (March, 1900), together with 2 Arrenurus 

 females of other species. 



15. Arrenurus meridionalis ? , n. sp. 

 Plate XXI., figs. 40-42. 



The only female specimen of this mite was found together with 

 the ^ oi A. capensis n. sp., described above, and at first I felt 

 inclined to regard it as the female of that species. The ? specimen 

 reminds one also of the females of related species, for instance, 

 A. bicuspidator Berlese, A. tricuspklator (Miiller), A. claviger 

 Koenike, &c. The large size of this ? , however, as compared with 

 the 3' oi A. capensis, the rounding of the frontal margin, the 

 shape of the genital plates and of the palps, &c., go against their 

 identification. Besides, with these 2 mites another 5 was found 

 which distinctly differs from all of them. The latter imago is, 

 however, so young that its shape was spoilt when caught or during 

 the preservation, and I prefer, therefore, to postpone the description 

 until more material is available. Meanwhile I must consider the 

 2 mites here mentioned as 2 different new species, and shall now 

 give the most conspicuous characteristics of A. meridionalis ? . 



Measurements. — 



Length of body 1-95 mm. 



Width ,, 1-16 mm. 



Height ,, 1-35 mm. 



Length of a palp (curved) 0-3 mm. 



The colour is green. 



