78 
Psyche 
[September 
land, the apparent scarcity in other parts of the United States and 
Canada would seem to be only because of the inattention of in- 
vestigators to this species and lack of collections. 
During the five months from June 14 to November 19, 1949, 8077 
fresh-water clams from 74 localities in New England, Quebec, and 
New Brunswick, representing 14 species, were examined for N. 
ingens. The mite was found in 48 or 58% of the localities. Al- 
together 906 specimens of N. ingens were collected, comprising 494 
males and 412 females. Specimens of the clam hosts, together with 
about 50 mites of both sexes and from each of the three hosts re- 
ported below, have been deposited in the Museum of Comparative 
Zoology, Harvard University. The assistance of Mr. William J. 
Clench of the Museum of Comparative Zoology in identifying the 
clams is gratefully acknowledged. 
Mites were collected from clams in the following localities which 
are indicated on the accompanying map (Fig. 1) : 
Massachusetts: (1) Sampson Pond, South Carver; (2)Monponsett 
Pond, Halifax; (3)Unionville Pond, Holden; (4)Carbuncle 
Pond, Oxford; (5)Lake Chaubunagungamaug, Webster; (6) 
Wiekaboag Pond, West Brookfield; (7) Sandy Pond, Ayer; (8) 
Ward Pond, Ashby; (9)Nabnassett Pond, Tyngsboro; (10) 
Mashpee Pond, Mashpee; (1 l)Buckmaster Pond, Westwood; 
(12) Lake Winneconnet, Taunton; (13)Quarter Mile Pond, 
Medford; (14) Forge Pond, Westford; (15) Bare Hill Pond, 
Harvard; (16) Warner’s Pond, Concord; (17) Heart Pond, 
South Chelmsford; (18) Lake Cochichewick, North Andover; 
(19) Winter Pond, Winchester; (20) Lake Attitash, Amesbury; 
(21)Fort Pond, Lancaster; (22)Hoosicwhisick Pond, Milton; 
(23)Hemenwav Pond, Milton. 
Rhode Island: (24) Worden’s Pond, South Kingston. 
Vermont: (25) Island Pond, Brighton; (26)Bomoseen Lake, Castle- 
ton; (27)Lake Champlain at Sandbar State Forest Park, Mil- 
ton. 
New Hampshire: (28) Crystal Lake, Eaton Center; (29) Province 
Lake, Effingham; (30) Wash Pond, Hampstead; (31) Island 
Pond, Hampstead; (32) Great Pond, Kingston; (33) Angle 
Pond, East Hampstead; (34) Country Pond, Newton. 
Maine: (35) Long Pond, at Long Pond; (36)Madawaska Lake, 
Stockholm; (37)stream at Ouelette ; (38)Eagle Lake; (39) 
