The two galls of the Tulip tree described by Osten Sacken. Monogr., Vol. I., p. 202, No. 26, C. liriodendri n. sp., and No. 27, C. tulipifera n sp., were wanting in the collection of his types presented by the Baron to the collection of the Museum in Cambridge. I am glad to state that I collected one of them in considerable numbers on leaves from a young Tulip tree on Quincy Street, Cambridge, in October, 1885. But all those galls were burst open along a part of the margin, and were empty. Prof. G. W. Farlow presented some collected in Newton, Mass., Oct. 12, 1886, and I found the living, full grown larva in one gall. r remembered then the tree in Cambridge, and found the same galls numerous, but again all empty. Apparently the larva has to be collected in the beginning of October, or somewhat earlier.