Müller (H.).—Ein Beitrag zur Lebensgeschichte der Dasypoda hirtipes.
Hoffer (E.).—Biologische Beobachtungen an Hummeln und Schmarotzerhummeln.
Jesse.—Gleaning in natural history.
Lubbock (Sir J.).—Ants, bees, and wasps. —The senses, instincts and intelligence of animals.
Walkenaer.—Les Halictes.
Westwood.—Introd. to the study of insects.
Rendu (V.).—De l'intelligence des animaux.
Espinas.—Animal communities.
Girard (M.).—Traité élémentaire d'entomologie, etc.