On the 24th of May I went collecting, with a friend, in High Park. We each took a specimen of the Tailed Blue (L. comyntas), but found, as we had expected, that it was too early for Scudder's Blue. On turning over an old boot that was lying on the grass, I saw a chrysalis of L. Scudderii attached to the under side; an ant was also on the sole of the boot, and ran round and round and over the chrysalis several times before going away; being, apparently, quite agiatated by the disturbance. Is it possible that this ant was keeping some sort of guard over the chrysalis, as ants are supposed to do over the larvæ of L. Scudderii? Its presence on the boot may have been merely accidental, but still, its movements gave one the impression that it was loth to leave the chrysalis, and would have liked to carry it away, if that had been possible.