In this contribution, Colacus rubrofemoratus Sobral, Morais, & Grossi new species (Coleoptera: Scarabaeidae: Dynastinae: Agaocephalini) is described and illustrated based on male specimens found in a transitional area of Caatinga, Atlantic Forest, and Cerrado in Brazil. In addition, the female of Colacus morio Ohaus, 1910 is redescribed, a distribution map for the genus is provided, and a new key to the species of Colacus is presented.

Keywords: Coleoptera, Agaocephalini, rhinoceros beetles, Scarabaeoidea, taxonomy

Rafael Sobral, José W. De Morais and Paschoal C. Grossi. 2019. A New Species of Colacus Ohaus, 1910 (Coleoptera: Scarabaeidae: Dynastinae) from the Mata Seca Biotope of Brazil, and Notes on Colacus morio Ohaus, 1910. Zootaxa. 4695(2); 159–167.  DOI: 10.11646/zootaxa.4695.2.5