THE ACARINA OF IOWA 211 



cattle. From Storm Lake, June 21, 1913; on cattle; by Dr. W. W. 

 Dimock. 



P. cgui (Herring), N. Acta. Ac. Leop., XVIII. p. 585, (1838). 

 Psoroptes of the horse. From Northwood; April 18, 1912; on horse; 

 by Sabin Reese. 



Family CYTOLEICHID.?^. 



LAMINOSIOPTES Megnin. 

 L. crysticola Vizioli, Giorn. Anat. F'isiol., vol. I, p. 257. (1870). 

 From Seymore; January 27, 1912; on pigeon; by Dr. W. W. Dimock. 

 From Des Moines; August 30, December 7, 1912; on chicken; by Dr. 

 W. W. Dimock. From Ames; January 30, 1913; on chicken; by Dr. 

 W. W. Dimock. From Morehead; by Dr. W. W. Dimock. 

 CYTOLEICHUS Megnin. 



C. nudiis Vizioli, Giorn. Anat. Fisiol., vol. I, p. 257, (1870). On 

 chicken; by Dr. W. W. Dimock. 



Family ERIOPHYDL.E. 



ERIOPHYES Siebold. 



E. pyri (Pagen.), Berh. Ver. Heidelberg, vol. I, p. 48, (1857). The 

 pear leaf blister mite. From Ames; on Russian pear trees; by H. 

 Osborn. 



E. guadripes (Shimer), Tr. Amer. ent. Soc, vol. II, p. 319, (1869). 

 The maple leaf gall mite. Generally distributed throughout the 

 state. June and July, 1884; by H. Osborn. 



The following unidentified species observed by Prof. H. Osborn are 

 mentioned in Iowa Agr. Coll. Bull. 2, pp. 58-61, (1884). The ash gall 

 Tnite. College grounds, Ames, June 16, 1884; the elm bud deformer, 

 Ames, January, 1883; under bark of elm. The box e.der mite; no 

 locality given. 



Family DEMODECID.E. 



DEMODEX Owen. 



D. canis Leydig, Ann. Xat. Hist., vol. XIII, p. 75, (1844). The hair 

 folicle mite of the dog. From Ames; January 17, 1917, on dog; by 

 Dr. W. W. Dimock. 



D. phylloides Csokor, Oesterr. Vierteljahrschrift. fur Veternarkunde, 

 vol. LI, p. 133, (i879). The hair folicle mite of swine. From Iowa on 

 pigs shipped to Ames; fall of 1916; by Dr. W. W. Dimock. 



CONCLUSION. 



1. The American Acarina are quite distinct from those of Europe. 

 The ihost Important exceptions are among the ticks and itch mites. 



2. The mite fauna of Iowa is in general very similar to that of 

 Illinois, yet it is interesting to note that in the vicinity of Ames we 

 find several of the northern forms. This is a little unusual because 

 Ames is located fully a hundred miles south of the lower limit of the 

 Transitional Life Zone. 



3. No records of sheep scab or human scabies have been noted in 

 recent years. Sheep scab at one time occurred in this state but due 



