ECOLOGY OP ISLE ROYALE. 251 



Hinidinidac. 



Macrohdella decora (Sav) Verrill. This species was quite abundant 

 at a marshy margin of Sumner Lake (III, 5), whej-e many specimens 

 were taken during July. This is a large species and easily recognized 

 by its dark brown dorsal surface and reddish colored ventral surface. 

 They are very graceful and conspicuous objects when seen swimming. 

 One specimen was taken upon a frog. Moore (1901, p. 511) reports this 

 sijecies as a time blood-sucker and that it is frequently found gorged. 



Geographic Range. IMaine; New York; Connecticut; Virginia; Mich- 

 igan; Minnesota; Illinois; Kansas; Nebraska. 



Hacinopsis grandis Verrill. One specimen was taken, July 5, on the 

 south shore of Siskowit Lake (V, 6). This is a mud leech and at times 

 leaves the water in search of earthworms (Moore, '01, p. 527). Also 

 taken in 1904 by Ruthven at Lake Desor (VII, '04), Ruthven, '06, p. 51. 



Geographic Range. Connecticut; Lake Huron; Michigan; Lake 

 Superior (A'errill, '74, p. 672) ; Yellowstone Park; Kansas; Alaska {H. 

 inarmoratis Moore, '98, p. 560); Michigan; Illinois; Nebraska. 



Hcrpohdellidae. 



Herpohdella lateralis (Verrill) Moore. On the south shore of Siskowit 

 Lake (V, 6) one specimen was taken August 5, and another specimen 

 was taken Julv 14, in shallow watei-, at the head of Rock Harbor 

 (III, 3). 



The type of this species came from near the northern shore of Lake 

 Superior. 



Geographic Range. ]Maine; Connecticut; Lake Huron; Lake Superior; 

 Colorado, (Verrill, '74, p. 675). 



Nephalopsis ohscnra Verrill. Egg capsules of these leeches were fallen 

 July 27 at Sumner Lake (III, 5), on a yellow water lily leaf (Nymphaea- 

 advena) and apparently young were associated with them; and similar 

 capsules were also found on Potamogeton leaves. A capsule was also 

 found in Rock Harbor at Neutson's Resort (IV, 5) also in a swampy 

 bayou off Tobin's Harbor (IV, 3) on July 21. Specimens of 

 the leeches themselves were taken in Siskowit Bay on the beach 

 at our camp (V, 1), in Siskowit Lake at a small island on the south shore 

 (V, 6) and at the swamp margin of a pond in the yellow water-lily and 

 Potamogeton zone (V, 11). Also taken in 1904 by Ruthven at Lake 

 Desor (VIT, '04), Ruthven, '06, p. 51. 



GeograjtMc Range. Wisconsin; Colorado (Verrill, '74, p. 674); Mich- 

 igan. 



1 REFERENCES. 



1874. Verrill, A. E. Synopsis of the North American Freshwater 



Leeches. Report U. S. Pish Comm. Pt. II, 1872-73, pp. 



666-689. 

 1898. Moore, J. P. The Leeches of the U. S. National Museum. Proc. 



U. S. Nat. Mus. Vol. 21, No. 1160, pp. 543-563. 

 1901. Moore, J. P. The Hirundinea of Illinois. Bull. 111. State Lab. 



Nat. His. Vol. 5, pp. 479-547. 



