(10) =OEneis brucei=, Edwards, Plate XXVII, Fig. 7, ♂ (Bruce's Arctic). _Butterfly._--Though somewhat closely related to the last species, Bruce's Arctic may at once be distinguished from it by the broad dark band on the under side of the secondaries and the great translucency of the wings, which permits a label to be read through them. It is found in Colorado and in British Columbia at an elevation of from twelve to thirteen thousand feet above sea-level. Expanse, 1.75 inch. _Early Stages._--All we know of these is contained in the pages of Edwards' great work. (11) =OEneis taygete=, Hübner, Plate XXVII, Fig. 6, ♂ (The Labrador Arctic). _Butterfly._--Much like _OE. brucei_, but the wings are not so translucent as in that species, and the broad mesial band on the under side of the hind wings is differently shaped, being more strongly directed outward just below the costa. The figure in the plate is from a specimen taken at Nain, in Labrador. Expanse, 1.75 inch. _Early Stages._--Unknown. There are eight or nine other species of _OEneis_ in our fauna, but they are all arctic, and most of them very rare. Those we have described and figured will give a good idea of the genus. IN THE FACE OF THE COLD When the full moon hangs high overhead, the snow creaks underfoot, the north wind roars with furious blast, and the trees of the forests crack in the frost with a report like that of cannon, then, hanging in its little nest on the bare branches of the wind-tossed trees, the tiny caterpillar of the Viceroy keeps the spark of life where men freeze and die. Nothing in the realm of nature is more wonderful than the manner in which some of the most minute animal forms resist cold. The genera _Erebia_ and _OEneis_, and many species of the genus _Brenthis_, are, as we have already learned, inhabitants of the arctic regions or of lofty Alpine summits, the climate of which is arctic. Their caterpillars often hibernate in a temperature of from forty to fifty, and even seventy, degrees below zero, Fahrenheit. It has been alleged that caterpillars freeze in the winter and thaw out in the spring, at that time regaining their vitality. Thus far the writer is unable to ascertain that any experiments or observations have positively decided for or against this view. A number of recorded cases in which caterpillars are positively stated to have been frozen and to have afterward been found to be full of vitality when thawed are open to question.