"The present volume contains all the essays on flies, or Diptera, from the Souvenirs entomologiques, to which I have added, in order to make the dimensions uniform with those of the other volumes of the series, the purely autobiographical essays comprised in the Souvenirs."--Translator's note.
"This volume contains all the essays on the Chalicodomœ, or mason-bees proper, which so greatly enhance the interest of the early volumes of the Souvenirs entomologiques. I have also included an essay on the author's cats and one on red ants--the only study of ants comprised in the Souvenirs."--Translator's note.