ECOLOGY OP ISLE ROY ALE. 253 



UEFEEENCES. 



1874. Smith, S. I. The Crustacea of the Fresh Waters of the United 

 States. Report U. S. Fish Comni. 1872-73. Pt. II, pp. 637-665. 



1907. Weckel, A. L. The Fresh-water Amphipoda of North America. 

 Pro. U. S. KaL Mus., 32, pp. 25-58. 



ISOPODA. 



Onlscidae. 



Cylisticiis conve.rus (DeG.). One specimen of this sow-bug was taken 

 at camp at the Light-house (I, 7) on July 15. (G. 99) . Another specimen 

 was taken July 2, at Mackinaw Island, Straits of Mackinac, Michigan, 

 cf. Richardson, '05, p. 609. 



Geographic Range. Massachusetts; New York; Washington, D. C. ; 

 Ohio; Michigan; Illinois; New Mexico; also Norway; Sweden; Den- 

 mark; British Isles; Geripany; Bohemia; Holland; Belgium; France; 

 Turkey. This species may have been carried to Isle Royale by man. 



REFERENCE. 



1905. Richardson, H. A Monograph of the Isopods of North Amer- 

 ica. Bull. No. 54, U. S. Nat. Museum. 



j 



ACAHINA. 



Rliyncoloplil'dae. 



Rhyncolophus simplex Bks. This mite was found in the thin soil and 

 debris beneath the mats of bearberry in a dry rock clearing (I, 2). 

 Banks, '04, p. 30. 



Hydrachnidae. 



Limnocliares extendens Say. This water mite was taken from the 

 water in the sedge zone 7iear the open water at Sumner Lake (III, 5). 



Geographic Range. "It occurs in northern states, from Maine to Mich- 

 igan, perhaps farther west." (Banks, in letter). 



' ARACHNffiA. 



Phalangiidae. 



Lacinius ohioensis Weed. Only three specimens of this Harvest Spider 

 were taken, one was foiind under stones on a shallow soil among the 

 Jack Pines (I, 5) in a very hot and dry locality; the second from the 

 margin of the sedge zone about a pond (V, 11), and the third from under 

 Cladonia on a rocky beach with a very shallow soil (V, 2). 



Geographic Range. Ohio, Illinois, Weed, '93, p. 559; Michigan. 



Dictynidac. 



Amaurohius 'bennetti Blk. A few specimens were taken under dry 

 bark in the hardwoods on a ridge north of the Club House at Washington 

 Harbor (V, '04) ; also from under the bark of decayed log in the maples 



