N8 



The Canadian Field-Naturalisi 



[Vol. XXXIV. 



October 5th, 1919, had unripe eggs in the brood 

 pouch. 



New records from Canada which I have for this 

 isopod are: 



Many specimens (about 5 mm. long and kss) 

 from stream pools at foot of Diamond Hill, Que- 

 bec City, September 19, 1919, (F. Johansen). 



Vlany specimens (up to 7 mm. long) from high 

 in canal at Alexandria Bay, Thousand Islands, 

 N.Y., September 1, 1919, (F. Johansen). 



Many (younger) specimens from Montreal 

 West, P.Q., October 19, 1918, (A. Willey coll.). 



A great number of specimens from pools, streams, 

 lakes and the river near and at Ottawa, April to 

 October, 1917-1919, (F. Johansen). 



I thus have it from the Gatineau river, Gat- 

 ineau Point, Hull Park and outside of Hull 

 ci-y, Bridgman's Creek, Chelsea Road, Catfish 

 Bay, Fairy Lake, foothills of Kings Mountain, 

 Deschenes, etc., on the Quebec side of Ottawa 

 district and from McKay Lake, Rockcliffe, etc., on 

 the Ontario side. 



It is exceedingly desirable that further data re- 

 garding the distribution of this common and im- 

 portant food for fishes and birds in Canada, both 

 north, east and west of the records from Canada 

 Inown £0 far (Quebec City to Georgian Bay), 

 should be secured. 



One of the two freshwater isopods occurring in 

 Canada, (Mancasellus) is thus to be considered a 

 more southern form with a limited distribution; 

 the other (Asellus) has a much wider distribution 

 from east to west, though its records from the 

 United States seem to indicate, that it may not be 

 found in the western provinces of Canada, nor in 

 Alaska. 



BIBLIOGRAPHY FOR CANADIAN FRESHWATER 



ISOPODS. 



Boone. P. L. Isopods. Report of Canadian 



Arctic Expedition 1913-18, Vol. VII, Part D. 



Ottawa, 1920. 

 Hay, O. P. Notes on some Freshwater Crustacea 



1882, (see under Amphipods). 

 Huntsman, A. G. Freshwater Malacostraca of 



Ontario, Contrib. to Canad. Biology, Fasc. II, 



p. 146-49. 



Orlman, A. E. Malacostraca, in Freshwater 

 Biology, 1918, p. 828-50. (see under Amphi- 

 pods). 

 Richardson, H. Monograph on the Isopods of 

 N.A., Bull, U.S.N. M. No. 54, Washington, 

 1905, p. 415, 420-421. 

 Smith, S. I. Crustacea Freshwater, U.S.A., Rep. 

 U.S. Comm. Fish. Pt. 2, (1872-73), etc., (see 

 under Amphipods). 

 Smith, S. I. and A. E. Verrill. Invert, dredg. in 

 Lake Superior in 1871, (U.S. Lake Survey), 

 etc., (see under Amphipcds). 

 Smith, S. I. Prelim. Rep. Dredg., Lake Super- 

 ior, 1871, (see under Amphipods). 

 Underwood, L. M. List of Freshwater Crustacea 



of North America (see under Amphipods). 

 Hunsman, A. G. Invertebrates, Nat. Hist. Toron- 

 to, Reg. 1913, p. 273-74, (see under Amphipods). 



Additional notes. 

 So little is known about the occurrence and hab- 

 its of the freshwater-crustacea during the winter, 

 that the following note in The Ottawa NATURAL- 

 IST for September, 1907, p. 102, is of in'erest: 



"Mr. W. S. Odell reports an abnormal abun- 

 dance (during the winter 1906-7) of certain 

 Crustacea observed under the following circum- 

 stances. At the openings cut through the ice on 

 the clay ponds or pits near the Rideau River, 

 crowded masses of Canthocampus, Cyclops and 

 Asellus aquaticus'^ came to the surface of the 

 water. . . . The ice was about a foot in thick- 

 ness, and the cold was intense, yet these water 

 animals had not been so thick for many years. 

 They decreased most markedly on the first mild 

 day. . ." 



In January, 1921, I received from Dr. A. G. 

 Huntsman of Toronto, three Asellus communis Say, 

 collected en October 31, 1920, near Milton, 

 Yarmouth County, in southern Nova Scotia. Dr. 

 Huntsman has kindly identified them as Asellus 

 communis Say (same as A. intermedius Forbes). 

 The specimens are in a poor condition; but as this 

 is the first record of freshwater isopods from the 

 Maritime provinces it should be included in this 

 article. 



'rot)ably A. cummiinis Say ( K..I.). 



(To be continued.) 



