206 IOWA ACADEMY OF SCIENCE Voi.. XXV, 1918 



TYDEUS Koch. 

 T. coccophaffus Ewing, Psyche, vol. XVIII, p. 38, (1911). From 

 Ames, August, 1910. (Species found in abundance attacking oyster- 

 shell scale.) August 17, 1910; from linden leaf; by H. E. E. 



Family BDELLID.*]. 



BDELLA Latreille. 



B. (ardinalis Banks, Tr. Amer. ent. Soc, XXI, p. 219, (1S94). From 

 Ames, September 10, 1909; under rotten bark; by H. E. E. 



B. peregrina Banks, var. ioirnrnsis Ewing;, Bull. Amer. Mu3. Nat. 

 Hist., vol. XXXVII, p. 150, (1917). From Ames; rare; under stick 

 in woods; by J. E. G. 



B. virgata Ewing, Univ. 111. Bull., vol. VII, p. 70, (1909). From 

 Ames, September 14, 1909; under bark of European elm; by H. E. E. 

 SCIRUS Hermann. 



.S'. quadripilis Banks, Tr. Amer. ent. Soc, vol. XXI, p. 220, (1894). 

 From Ames, October 26, 1909; under old piece of wood; by H. E.. E. 



EUPALUS Koch. 



E. parvus Ewing, Bull. Amer. Mus. Nat. Hist., vol. XXXVII, p. 151, 

 (1917). From Ames. Mentioned by R. L. Webster and H. E. Ewing 

 in Psyche, vol. XIX, pp. 121-134. Found on Lepidosaphes ulmi Linn. 

 An enemy of oyster shell scale, but not numerous at Ames; by T. M. 

 McCall. 



Family CHEYLETID.^. 



MYOBIA Heyden. 

 M. musculi Schrank, Enum. Inr,. Austr.. p. 301. (1781). Megnin, 

 J. Anat. Physiol., vol. XIV, p. 432, (1878). From Ames; common on 

 mice; by H. Osborn. 



Family ANY^STID.E. 



ANYSTIS Heyden. 

 A. (igilis Banks, Tr. Amer. ent. Soc, vol. XXI, p. 211, (1894). From 

 Ames, September 14, 1909; under bark of wild cherry; by H. E. E. 



Family TETRANYCHID.^. 



TETRANYCHUS Dufour. 

 T. erythreus Ewing, Bull. Amer. Mus. Nat. Hist., vol. XXXVII, 

 p. 152, (1917). From Ames, September 27, 1909; by H. E. E. 



T. telarius Linn., Fauna Suecia. p. 481. (1761). The common red 

 spider or spider mite. Frorn Ames and Des Moines. Reported from 

 Iowa on the following plants: tomato, potato, apple, alfalfa, ever- 

 greens, chrysanthemum. 



Family ERYTHR^EID.^. 



ACHuROLOPHUS Berlese. 

 A. ignotus (Oudemans), Ent. Ber., vol. I, p. 92, (1903). From Ames, 

 July 22, 1910; on a larva of Meianoplus bivittatus; by H. E. E. 

 ERYTHRu^IIS Latreille. 

 E. graciUpes (Banks), P. ent, Soc. Washington. From Ames, October 

 5, 1909; under old piece of wood; by H. E. E. 

 E. graciUpes (Banks), P. ent, Soc. Washington. From Ames. October 



