208 



Acarology 



the cockroach. The tarsi have a pair of claws, each with a pair of 



tenent hairs. No genital suckers 

 are present and the anal opening 

 is posterior. 



Figure 138 Pimeliaphiliis podapolip- 

 ophagus Tragardh. Dorsum of female. 



Genera: 



Figure 159 Pterygosoina neiiinanni 

 Berlese. A typical lizard parasite form. 

 (After Hirst 1925) 



1. Pterygosoma Peters, 1849 



Type. Pterygosoma agamae Peters, 1849 



2. Geckobia Megnin, 1878 



Type. Geckobia latasti Megnin, 1878 



3. Geckobiellan\YSi,\9\l 



Type. Geckobia texana Banks, 1915 



4. Hirstiella Berlese, 1920 



Type. Geckobiella {Hirstiella) trombidiformes Berlese, 1920 



5. Ixodiderma Lawrence, 1935 



Type. Ixodiderma inverta Lawrence, 1935 



6. Pimeliaphilus Tragardh, 1904 ( = Pimeliaphiloides Vitzthum, 1942) 

 Type. Pimeliaphilus podapolipophagiis Tragardh, 1904 



7. Scaphothrix Lawrence, 1935 



Type. Scaphothrix convexa Lawrence, 1935 



8. Zomirobia Lawrence, 1935 



Type. Zonurobia cordylensis Lawrence, 1935 



Discussion: The Pterygosomidae, for the most part, are parasites of 

 lizards, usually being found beneath the scales of their host. Accord- 

 ing to Hirst 1925: "When more than one form of Geckobia is found 



