(dr. a. c. otjdbmans) notes on acari. 179 



The tectopedia are six in number , protecting with a shield-kind 

 processus resp. the bases (coxae) of the first, second and fourth 

 pair of legs (fig. 2). 



The legs may be grouped in two parts, viz. the two fore-pairs 

 and the two hind-pairs. The coxae of the two fore-pairs are not 

 visible, whilst those of the hind-pairs are so. These coxae are 

 nearly globular, and those of the thiid pair of legs have a sharp 

 pointed right angle on their fore-side , directed towards the metasoma. 



The tarsi of the two hind-pairs are more elongated than those 

 of the two fore-pairs. Moreover the four pairs of legs are identical 

 even in the position of their hairs (fig. 2). 



On the under-side (fig. 3) we observe the camerostome with 

 the labium, the maxillary lips and maxillae (masticatory part of 

 the maxillipedes) and the palpi (tactil part of the maxillipedes) , the 

 first pair of epimera fused together, the second, third and fourth 

 pair of epimera all free, the genital opening with the genital 

 plates, the anal opening shut by the anal plates, and the 

 furrow between the ventral and the dorsal shield. Moreover we 

 observe 14 pairs of large dermal pori, arranged exactly as our fig. 

 shows. Just before the anal split there is a very small chitinised 

 third medial valve or protuberance. Hitherto I did not found any 

 mentioning of this object anywhere in works on Acari. 



The animal's hairs are smooth, feathered, comb- or saw-like, or 

 club-shaped. 



The very small hairs accompanying the pori (fig. 5) , and the 

 long straight hairs on the legs are smooth , the two hairs on the 

 forepart of the prosoma (cephalotorax) are feathered (fig. 6). The 

 small and curved hairs on the legs are feathered on one side, 

 comb- or saw-like (fig. 7). On the under (inner) side of the tarsi 

 of the two foremost legs of the males we observe a club-shaped 

 hair, transparent like glass (fig. 4). 



The genital and anal plates are normal. 



The protecting hair (Nicolet) or pseudostigmatic organ (Michael) 

 is spool shaped in its proximal , and filiform in its distal end (fig. 8). 



Special organ. I believe that the club-shaped hair on the tarsi of 

 Tijdschr. v. Eniom. XXXIX, 13 



