CORRESPONDENCE.
SWARMING OF ARCHIPPUS.
Dear Sir,—
The assembling of D. archippus referred to in Can. Ent. is perhaps not so frequently noticed as their passing over localities in flocks. Several years ago I saw them congregating in a bit of woods in the neighborhood of the city which I was visiting at the time. At least every other day they were hanging in a listless kind of manner to the underside of branches in immense numbers, with their wings closed, and not noticeable unless disturbed, very few being on the wing. Their favorite resting place seemed to be dead pine twigs, which would be drooping with their weight, and in more than one instance I saw one too many light and the twig snap, and send a dozen or more into the air to seek for another perch. In going to and from the woods I have seen several of them at once coming from different directions, high in the air, sailing along in their own easy and graceful way, all converging to the one spot. I did not see them depart. I went one day and could not find one in the woods; and as there were thousands, perhaps hundreds of thousands of them, it would have been a fine sight to see them go. The following year they were remarkably scarce and it was three years before they were even moderately plenty.
J. Alston Moffat, Hamilton, Ont.
SWARMING OF ARCHIPPUS.
Dear Sir,—
I was surprised to learn from the letter of Mr. Edwards in your last issue, that the flocking of archippus is not a well known fact in Entomology, and in view of this I venture to add a few facts in regard to it which may be of interest.
