414 



Acarology 



many; Cepheus cepheijonnis, vector of C. ctenoides and C. denticulata 

 in Germany; and Carabodidae sp., vector of Anoplocephala perjoliata 

 in the U.S.S.R. 



Ameronothridae Willmann, 1931 



Figure 342 



Diagnosis: A sclerotized formation bridges the pro- 

 podosoma and the hysterosoma and no true dividing 

 suture is present. The skin is leather-hke. There are 

 no pseudostigmata, sensory setae, or tectopodia ii 

 and III. 



Figure 342 Ameronothnis schneideri (Oudemans). Dorsum 

 of female showing lack of suture between propodosoma and 

 hysterosoma. (After Oudemans 1905) 



Genus: 



Ameronothnis Berlese, 1896 



a. Ameronothrus s. str. 



Type. Eremaeus Uneatus Thorell, 1871 



b. Hygroribates isLCOi, 1934 



Type. Nothrus (?) nuiriniis Banks, 1896 



Discussion: The species belonging to this genus live close to the 

 seashore, usually in the tidal zone. A few are known from Europe. 

 Ameronothnis {Hygroribates) marinus (Banks) was found on rocks 

 in the tidal zone at Sea Cliff, N. Y. Jacot 1934 subsequently found it 

 in restricted areas along the New York coast and Grandjean 1947 

 collected it on the French coast. Jacot states: "it is evident that this 

 species is distinctly marine though mostly restricted to estuaries and 

 harbors, i.e., where there is not too much sand scour, and thus where 

 growths of films of unicellular algae may develop. It would therefore 

 not be expected on the exposed headlands between the bays where 

 algal coated rocks are rare or absent. I also suspect that it would be 

 rare or absent where rocks are without crannies and fissures. The 

 rougher the rock (as schist) the better. Another factor limiting the 

 spread of the species is that of viviparity. This means that there are 



