To an interesting lot of Longicorn Beetles, communicated to me by Mr. René Oberthür, was joined the unique type-specimen of the genera Hysterarthron (collare) Thoms. and Camira (sexmaculata) Thoms., both described by the author as belonging to the family of the Cerambycidae ¹). I was astonished to find that the first did not at all belong to the named family, its anterior tarsus being composed of five joints²) (the middle legs are wanting). A further examination showed me that Hysterarthron collare Thoms. belongs to the family of the Lagriidae, and that it will find its place in the neighbourhood of the genera Statira Serv. and Casnonidea Fairm.