Center for Systematic Entomology, Gainesville, Florida


Date of this Version



Halstead DGH. 2020. New and little known Coleoptera (Silvanidae: Silvaninae) from Central and South America. Insecta Mundi 0842: 1–37.

Michael C. Thomas Festschrift Contribution


Copyright held by the author(s). This is an open access article distributed under the terms of the Creative Commons, Attribution Non-Commercial License,

Published on December 25, 2020 by Center for Systematic Entomology, Inc. P.O. Box 141874 Gainesville, FL 32614-1874 USA


The following Silvaninae (Coleoptera: Silvanidae) are included: Synobius Sharp, 1899, with its spe­cies, Synobius lobicollis Sharp, 1899 and Synobius lobatus (Grouvelle, 1896); Neocorimus thomasi, new genus and new species; Austronausibius wagneri (Grouvelle) new combination, a species originally placed in Nau­sibius Lentz by Grouvelle (1913); a third species of Pensus Halstead, 1973, is described, Pensus hirtus new species, and a short key given for distinguishing it from the already known species, Pensus gilae (Casey) and Pensus guatemalenus (Sharp); also Coccidotrophus Schwarz and Barber, 1921, including Coccidotrophus socialis Schwarz and Barber, 1921, Coccidotrophus cordiae Barber, 1928, Coccidotrophus wheeleri (Schwarz and Barber) new combination (a species originally placed in Eunausibius Grouvelle by Schwarz and Bar­ber (1921)) plus two new species, Coccidotrophus platyops, new species; Coccidotrophus trinidadensis, new species making a total of five in this genus; other taxa included are, Eunausibius Grouvelle, 1913, with its described and a new species as follows, Eunausibius tenebrionoides (Grouvelle), Eunausibius jatahyensis, new species, Eunausibius elongatus (Grouvelle); and finally Annomus bolivianus, new genus and new species. Additionally, taxonomic changes are made for two species originally described in Eunausibius: Nausibius lophius (Parsons) new combination (= Eunausibius lophius Parsons) and Nausibius salutaris (Parsons) new combination (= Eunausibius salutaris Parsons). Descriptions, diagnoses, and illustrations (habitus and male genitalia line drawings plus four color habitus photographs) are provided.

The Silvanidae (Silvaninae) of Central and South America are not well known. There are, however, various stud­ies that contain descriptions of a reasonable number of Silvaninae taxa found in this part of the world, including those of Sharp (1899), Grouvelle (1881, 1889, 1896, 1913), Reitter (1878), Schwarz and Barber (1921), Barber (1928), Parsons (1974) and Halstead (1973, 1993). Of these, Sharp’s and Grouvelle’s studies are wide ranging and therefore of particular interest. The author has been working on the subfamily for many years and, amongst loans of material collected in Central and South America, has found a large number of undescribed species, mostly spe­cies of Ahasverus Gozis (sensu lato; at least one new genus to be erected) and Nausibius Lentz, two genera from this part of the world currently being studied. The following account includes descriptions of a few new taxa, and redescriptions of other little-known ones.