ACARI 563 



Stigmataon a level with the anterior side of coxse IV ; 

 peritremata bending twice slightly outwards, once, between 

 coxse III and IV, inwards. 



Geniti- ventral shield irregularly hexagonal, longer than 

 it is wide (4 : 3), anteriorly rounded, posteriorly truncated. It 

 bears only two pairs of snbmarginal liairs ; one, the génital 

 one, on a Hne behind the sternal hairs ; the other pair at the 

 latéral angles. Anal shield almost equilaterally triangular, 

 with truncated anterior margin slightly convex sides, and 

 obtusely pointed end. It lias the usiial three circumanal hairs. 



On the portion of soft cuticle surrounding the shields there 

 are two pairs of liairs ; and at the posterior margin of the body 

 there are three pairs. 



Legs. 



Legs II larger than the others (fig. 74 a) ; fémur thick, as wide 

 as it is long, and with one perpendicular, conical, obtusely 

 rounded tubercle, ventrally, a little in front of the middle. On 

 a level with the tubercle a perpendicular bristle. Near the ante- 

 rior margin of the trochanter and genu respectively a stout 

 bristle, dhected obliquely forwards and downwards. Tarsus 

 with well demarcated basitarsus, curved slightly downwards 

 and ending in a strong spur, at the dorsal side of jwhich the 

 ambulacre is articulated (fig. 74 &) ; a little behind the ambu- 

 lacre there is a very stout, horn-shaped [bristle, projecting 

 beyond the top of the tarsus, and still farther back there is, 

 on the external side, another shorter and conical, but yet very 

 large, bristle. 



PROTOLAELAPS nov. gen. 



(Fig. 75-86). 



In a previous paper (1910) the author described a nymplia 

 found in the iiest of a lemming, which was provisionally refer- 

 red to Gamasellus Berl. and named G. hrevisfinosus Tgdh on 

 account of the numerous short bristles on the legs. 



