A PRELIMINARY LIST OF THE ACAIUXA OF IOWA 

 ALBERT HARTZELL. 



In 1886, Professor Herbert Osborn and Professor L. M. Un- 

 derwood published, in the "Canadian Entomologist," a pre- 

 liminary list of the Acarina of North America. This list in- 

 cluded 99 species in 28 genera. In 1907, Nathan Banks pub- 

 lished his "Catalog- of the Acarina, or Mites, of the Unit^nl 

 States," which includes about 450 species in 133 genera. This 

 number probably represents less than one-third of our mite 

 population. 



The mites of New York, Ontario, Virginia and Illinois have 

 been studied to a considerable extent, but larg'e areas still re- 

 main to be covered and very few local lists have been publislied. 

 In fact so little is kno^^^l of tilie distribution of the various species 

 that Banks omits all locality reference in his catalog. The mite 

 l^opulation in the vicinity of Ames has been (^uite well covered 

 l)y Dr. H. E. Ewing, out records from other places in the state 

 are few and scattered. 



In the preparation of this paper complete data have been 

 given wherever obtainable. This includes a reference to the 

 original description, locality, date, habitat and name of the 

 collector. Collections made by Dr. H. E. Ewing and Professor 

 J. E. Guthrie are accredited H. E. E. and J. E. G. respectively. 

 The Zoological Record has been used as a standard for ab- 

 breviation of publications. 



Dr. H. E. Ewing has kindly placed at the writer's disposal 

 his private collection, which has been invaluable in the prep- 

 aration of this paper. Dr. W. W. Dimock of the Veterinary 

 Division, Iowa State College, also has contributed much in mak- 

 ing this paper more useful by furnishing several important 

 records of parasitic species. 



Family EUPODID.E. 

 RHAGIDIA Thorell. 



R. pallida Banks, Tr. Amer. ent. Soc, vol. XXI, p. 222, (1894). 

 From Ames, March 3, 1910; under bark of log; by H. E. E. 

 LINOPODES Koch. 



L. antennaepes Banks, Tr. Amer. ent. Soc, vol. XXI, p. 221, (1894). 

 FVom Ames, September 30, 1909; under a log; by H. E. E. 

 EUPODES Koch. 



F, variaUlis Banks, Tr. Amer. ent. Soc, vol. XXI, p. 221. (1894). 

 From Ames, September 18, 190d; under an old piece of wood; by H. 

 K E. From Grinnell, April 30, 1910; under a board in damp place; 

 by J. E. G. 



