

BRITISH MUSEUM (NATURAL HISTORY), loept. o\. Zf^^tf^^oU 



STUDIES ON ACARL 

 No. 1. 



The Genus DEMODEX, Owen 



<'WITH THIRTEEN PLATES AND FOUK TEXT-FIGURES.) 



BY 



STANLEY HIRST 



{Asmtant in the Department of Zoolugy) . 



LONDON: 

 PRINTED BY ORDER OF THE TRUSTEES OF THE BRITISH MUSEUM. 



1919. 



\_All rights reserved. ~\ 



