NEW NORTH AMERICAN ACARINA. 
H. E. EwInc. 
INTRODUCTION. 
In this country little has been done upon the general 
study of Acarina. Most of the work which has been done 
is upon special families or groups, or upon those species 
which have an especial economic importance. Mr. Nathan 
Banks has made a somewhat general study of our mites 
and has described many species from different parts of the 
country. In his “Treatise on the Acarina, or Mites,” Proc. 
U.S. Nat. Mus. 28:1-114, he reviews the work done on 
the Acarina in our country and gives excellent keys to our 
genera. 
Up to the present time about 500 species of the order 
Acarina have been recorded from America, most of which 
are referable to European genera. It may be that a study 
of the subtropical or arctic mites will reveal several new | 
genera peculiar to our continent; of the former, especially, 
scarcely anything is known up to the present. 
The writer is indebted to the following persons for the 
collection of many of the specimens used in the following 
descriptions: Mr. C. R. Crosby, assistant entomologist, New 
York State College of Agriculture; Mr. J. D. Hood of the 
University of Illinois; Mr. C. A. Hart, systematic entomol- 
ogist of the Illinois State Laboratory of Natural History; 
Mr. E. O. G. Kelly, ex-assistant to the State Entomolo- 
gist of Illinois; and L. M. Smith, assistant to the State 
Entomologist. 
Dr. J. W. Folsom has aided the writer in several ways 
and Dr. 8. A. Forbes has offered him all the privileges of 
the Illinois State Laboratory of Natural History. In this 
laboratory type specimens have been deposited. 
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