TRÄGÅRDH, MORPHOLOGY AND PHYLOGENY OF PARASITID.E. 15 



gynial shield another, placed outside the middle of it; thus 

 in all, in the part of the belly between the legs, 5 pairs of 

 hairs, the last one of which is, however, placed slightly be- 

 hind coxae IV. 



In the male (Fig. 22) we also find these 5 pairs of hairs, 

 although all the shields are fused into one. If we examine 

 other genera amongst the ParasitincB, Lcelaj)tince , Dermanys- 

 since or Zerconinoe., we always find the same 5 pairs hairs, 

 except those forms in which the epigynial shield of the 



Fig. 23. 



Fig. 24. 



Fig. 23. Proiolcelaps brevispinosus (Tgdh.) 9, ventral view. X 56 



(after Trägård h). 



Fig. 24. Holostaspis vagabundus Berl. $, ventral shields 



(after Trägårdh). 



female has more than 1 pair of hairs, e. g. in the nymphs 

 of Cyrtolcelaps Koclii Tgdh. [16. fig. 86, p. 419], where there 

 are two pairs; or in the nymphs of Lcelaps, where there are 

 numerous hairs [16. fig. 119, p. 436]. 



If thiis the number of hairs is constant (except on the 

 epigynial shield), the position of the hairs varies in the dif- 

 ferent genera and from this we may draw valuable conclu- 

 sions regarding the mode in which the different shields are 

 fused with one another. In Gamasellus spiricornis (1) [16. 

 fig. 102, p. 427], G. & R. Can., Proiolcelaps (Fig. 23) and 

 Hydrogamasus, for instance. the sternal shield has 4 pairs of 



