The interesting paper by Mr. J. A. Lintner, Entom. Contributions, No. iv., induces me to give some extracts from the papers by Prof. von Siebold, which the author could not compare himself, the more as they answer some important questions.

“I examined with much interest, in the Museum in Breslau, Prussia, the specimens of hair worms communicated by different persons. Those worms were found living in the heart of the apple some years ago, very frequently in Silesia (by F. S. Leuckart, Zoolog. Bruchstuecke, Heft I., 1820, p. 5). Four of them belong to Mermis acuminata, and others also to Mermis; also a specimen in Prof. Otto's collection. The Filaria found in an apple by Prof. Waga will probably also be a Mermis (Revue Zool.,1844, P. 366).”