Helophorus arcticus Brown was described (1937, Can. Ent., LXIX, 109) from a single specimen taken by the describer in August, 1935, at Lake Harbour, Baffin Island, which is situated on the north shore of Hudson Strait at latitude 62° 50', longitude 69° 52'. The specimen was found beneath an old caribou horn resting on moss a few feet from the seashore.

During the summer of 1938 the Royal Ontario Museum of Zoology, Toronto, organized an expedition to the little-known region of Favourable Lake, in the Patricia portion of the Kenora District, about 70 miles from the Manitoba boundary (53° 50' N. Lat., 93° 40' E. Long.). In 1939, two small parties were sent out by the Museum, one to Attawapiscat Lake, also in the Patricia country (52° 10' N. Lat., 88 E. Long.), and the other to various stations in the Cochrane District, from Cochrane northward to Moosonee on James Bay.

It is the purpose of this paper to add a few hitherto unreported species of Ontario Orthoptera to the list of those already recorded for the province. The majority of the species here recorded were taken by the junior author in Essex County in the extreme southwestern portion of the province of Ontario and are the result of an expedition sponsored by the Royal Ontario Museum of Zoology.