Considerations on described taxa, Procolobostema roseni, new species, from Dominican amber, and the position of Procolobostema in the family

17 p. : ill. ; 26 cm.Includes bibliographical references (p. 15-17)."The fossil Scatopsidae are reviewed. For Meunier's species in Eocene Baltic amber: Scatopse fasciola Meunier is transferred to Ectaetia; Scatopse subsimilis Meunier is transferred to Rhegmoclemina; and Scatopse grassaris Meunier and Scatopse crassicornis Meunier are considered unplaced in the Scatopsidae. Protoscatopse jurassica Rohdendorf and Mesoscatopse rohdendorfi Kovalev are kept as Scatopsoidea incertae sedis. The generic placement of Reichertella fasciata Melander is retained. Scatopse bilaminata Cook and S. primula Cook from Upper Miocene/Lower Oligocene Chiapas amber are removed to Rhegmoclematini incertae sedis. Procolobostema is accepted as a valid genus. Procolobostema longicorne Cook is synonymized with P. hurdi Cook. Procolobostema incisum Cook and P. obscurum are also indicated as possible junior synonyms of P. hurdi Cook. A new species of the genus Procolobostema Cook is described based on large series of males and females in Dominican Republic amber (early Miocene). The differences between the Chiapas and the Dominican Republic species of the genus are considered. The phylogenetic position of the genus in the Scatopsidae is discussed. Procolobostema certainly belongs to the Colobostematini. Borneoscatopse Freeman, known from a single Recent species described from one male from the Oriental Region, is considered the sister group of Procolobostema. This corresponds to an Oriental Region/Caribbean biogeographical component, similar to that seen in Valeseguya (Anisopodidae). This may correspond to a more general pattern of distribution, which could be related to the geological evolution of a fragmented Pacifica continent. Because Mexico and Hispaniola were already separated at the Miocene, independent extinction would have to be admitted for these species of Procolobostema"--P. [1]-2