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Text Ficurs 12.— Hoctenes nycteridis (Horvath): A, Male; 
B, tarsus of middle leg; C, general appearance of genitalia; ’D, antenna; 
E, spiracle 
MALLOPHAGA 
A. THE MALLOPHAGAN FAUNA OF THE MAMMALIAN FAMILY PROCAVIIDAE 
The material forwarded by Dr. Bequaert included one bottle containing 
great numbers of Mallophaga labelled as from Procavia (Dendrohyrax) adolfi- 
friederict Brauer, Lulenga, Belgian Congo, March 2, 1927 (J. Bequaert). This 
one bottle contained six quite distinct species of the family Trichodectidae. This 
material, together with other specimens that are at hand, makes possible a re- 
view of the Mallophagan fauna of the Procaviidae (Hyracidae). There are in 
connection with this fauna certain aspects of very considerable interest. 
As has many times been pointed out, the distributional problems associated 
with the ectoparasites of birds and mammals are among the most interesting 
phases of the study of these groups of insects. It would be out of place here to 
enter into a general discussion of these problems, but I may call attention to that 
particular one which is most beautifully illustrated by the material at hand. 
The distribution of such ectoparasites as the Mallophaga and Anoplura is 
biologically practically analogous to that of island species. Biologically each host 
