Professor Sereno Watson communicated to me some twigs cut on the grounds of Mr. Henry Watson, in Northampton, Mass. Several Larix Europea about thirty years old stand on an avenue, and have never suffered before. In April they showed to a large extent pale needles and many little larvæ of the well known sac-bearing form. In May numerous slate-colored moths appeared, the true Coleophora laricella Hub. This insect in all its stages is well described in Stainton's Nat. Hist. Tineina, vol. iv., p. 1, and figured on pl. i., f. 2. It would be useless to give a description here. our biological collection possesses types of all stages by Rosenhauer, Zeller and Hofmann. As far as I know, it has not yet been observed in the united States. Some twigs given by the rate J. Boll were perhaps collected in 1872 in cambridge, Mass.; but as he did not mark any locality on the label, I am not sure that he did not brins them over from Europe. I am not able to find any published notice in North American papers. I may notice that the caterpillar keeps its abode very clean by expelling the fæces out of a hole in the needles.