Antepenultimate Instar. Head width 1.4 mm. Body about 13 mm. long and 2 mm. wide. Crochets on first abdominal proleg number 14 to 16.

Penultimate Instar. Head width 1.7 to 2.0 mm. Body from 15 to 17 mm. long and about 2.5 mm. wide; ground colour medium to dark green, the moderately broad white dorsal line separated from the slightly broader white subdorsal lines by twice its width in ground colour; white patches, more conspicuous in anterior segments, immediately distad of each seta alpha; spiracular line dark green, subspiracular line white with a fringe of yellow.

During the summer of 1941, Colias eurytheme Bdv. appeared in the Edmonton district for the second time in twenty-five years, the last appearance having been in 1923.

During the fall and winter of 1938 the author conducted a brief study of the food habits of trout in Rattlesnake Creek, Missoula County, Montana. In the course of this investigation numerous bottom samples were taken, the final analysis of which yielded interesting but incomplete information concerning the distribution of several species of mayfly nymphs over part of the stream.

This list is based on one compiled by Dr. H. J. Brodie of Winnipeg and published in the Transactions of the Royal Canadian Institute, vol. XVII, part 1, 1929. Since that time the completion of the Hudson Bay Railway to Churchill has opened up territory, which previously had been but slightly worked and has made easily accessible country where the flora and fauna are subarctic. Also a number of new species, subspecies, races, and aberrations have been described from the Province, which seems to make a revised check list advisable. The old list contained 121 names, and that total has now been broucht to about 170.