OF NORTH AMERICA. 189 



Canadian area of this zone. It is exceedingly doubtful if this species 

 really lives in any area south of the Transition zone. Referring to 

 its distribution in relation to the forest areas, we find that its center 

 of dispersal is in the coniferous regions of the northern United States 

 and Canada. In the southeast and south of this area it extends into 

 the region of deciduous forests and on the southwest into the prairie 

 region of the Mississippi Valley. Its range is probably between the 

 41st and 60th degrees of north latitude and between the 73rd and the 

 100th degrees of west longitude. Lord 1 records mcgasoma from Lake 

 Osoyoos, British Columbia, but this is undoubtedly a case of misidenti- 

 fication, as the species has never been reported so far west, except in 

 this instance. 



RECORDS. 



UNITED STATES. 



IOWA: Winnebago and adjoining counties (Keyes) ; pond near Forest City, 

 Winnebago Co. (Shimek). 



LAKE SUPERIOR: Lake Superior (Newberry; Chicago Academy of Sci- 

 ences). 



MASSACHUSETTS: Massachusetts? 2 



MICHIGAN: St. Joseph River, Berrien Co. (Smith. Coll.); Drummond's 

 Island and St. Mary's River, Chippewa Co. ; Lake Huron ; Higgins River and 

 Marl Lake, Roscommon Co.; Green Bay, Menominee Co.; Isle Royale (Walker). 



MINNESOTA: Lake Minnetonka, Hennepin Co. (Miss A. A. Abbott); 

 Elk River, Sherburne Co. (Bailey) ; St. Louis and Lake Counties (Grant) ; 

 Duluth, St. Louis Co. (Leidy) ; Minnesota (Chicago Academy of Sciences). 



OHIO: Alliance, Mahoning River, Stark Co. (Kirtland; Sterki ; Ulrich). 



VERMONT: Burlington, Crittenden Co. (Smith. Coll.); near Lake Cham- 

 plain (Hudson; Marshall; Stimpson). 



WISCONSIN : Tomahawk Lake and Wiscon'sin River, Oneida Co. (Baker) ; 

 Moles Creek, between Two Rivers and Two Creeks, Manitowoc Co. (C. E. 

 Brown; C. H. Chadwick) ; Lake Koshkonong, Jefferson Co. (Chadwick) ; West 

 Superior (Conrad); West side Green Bay (Crawford; Wetherby) ; St. Croix 

 River, Douglas Co. (Dr. S. Grsenicher) ; Oconto, Oconto Co. (Geo. T. Mars- 

 ton) ; Green Bay (Smith. Coll.) ; Oconto, Oconto Co., in marsh (Mrs. E. C. 

 Wiswall). 



BRITISH AMERICA. 



KEEWATIN : Vermilion Lake to Echinamish Lake, in lat. 57 n., between 

 the Nelson and the Height of Land (Bell) ; Echinamish River (Bell; Hanham). 



MANITOBA: Bois Blanc Lake (Bigsby, Say). 



ONTARIO: Pic River, Lake Superior (Agassiz) ; Vermilion Lake, Rainy 

 River District; Creek near Hawksbury, Prescott Dist. (Bell); Bonnechere River 

 (Billings) ; Meech's Lake, near Ottawa, Carleton Dist. (Latchford) ; Georgian 



J Nat. in. Brit. Col., II, p. 356. 



2 A tray of this species marked Massachusetts (Stearns' collection, No. 

 63460) is in the collection of the Smithsonian Institution, but the locality 

 needs confirmation. No authentic record has been seen from any New England 

 state excepting Vermont. (Lake Champlain.) 



