Introduction The genus Tantilla (Squamata: Colubridae) is currently composed of 63 species of small, semi- fossorial snakes distributed throughout the Western Hemisphere (Wilson & Mata-Silva, 2015; Batista et al., 2016; Koch & Venegas, 2016). Given their size and secretive nature, few specimens exist for many taxa, and 13 of the 63 described species (20.6%) are known only from the holotype (Wilson & Mata-Silva, 2015; Batista et al., 2016). Three members of the genus have been reported from Belize (Stafford et al., 2010): T. cuniculator Smith, 1939; T. hendersoni Stafford, 2004; and T. schistosa (Bocourt, 1883). Tantilla moesta (Günther, 1863) was considered to occur in Belize by Stafford (2004), but not reported for the country by Stafford et al., (2010) or Wilson & Mata-Silva (2015), and no verified reports from Belize are known to us. Tantilla hendersoni was described on the basis of a single female specimen (BMNH 2002.3) collected near Las Cuevas in Cayo District (Stafford, 2004), and is considered the only species of snake endemic to Belize (Stafford et al., 2010). Since the discovery of the holotype, one additional individual was photographed near the type locality, but not preserved (Stafford et al., 2010: 385), and no additional specimens of this species have become available for examination. On 30 August 2016, a single male Tantilla hendersoni was collected during field work at the Toucan Ridge Ecology and Education Society (TREES) Field Station near Middlesex in Stann Creek District, Belize (17.0508° N, 88.5689° W; elevation 194 m; datum WGS84; Fig. 1). We provide the following morphological data and color notes for this specimen, the first adult male known for the species, and discuss the distribution, conservation, and taxonomic status of the species. Methods and materials The Tantilla hendersoni specimen (CM 158957; Figs. 2 & 3) was found deceased in a funnel trap during a study comparing snake community assemblages across anthropogenically altered and undisturbed habitats. The specimen was initially frozen, then later preserved using a 10% formalin solution before final storage in 70% ethanol, and deposited in the Carnegie Museum of Natural History (CM; Pittsburgh, Pennsylvania, USA). All measurements were taken to the nearest 0.1 mm using digital calipers under a microscope, except Herpetology Notes, volume 10: 53-57 (2017) (published online on 27 January 2017) Discovery of the first male specimen of Tantilla hendersoni Stafford, 2004 (Squamata: Colubridae), from a new locality in central Belize Erich P. Hofmann 1, *, Russell J. Gray 2 , Larry David Wilson 3 and Josiah H. Townsend 1 1 Department of Biology, Indiana University of Pennsylvania, Indiana, Pennsylvania 15705–1081, USA 2 Toucan Ridge Ecology & Education Society, 27.5 Hummingbird Highway, Stann Creek District, Belize 3 Centro Zamorano de Biodiversidad, Escuela Agrícola Panamericana Zamorano, Depto. Francisco Morazán, Honduras * Corresponding author e-mail: erich.p.hofmann@gmail.com Abstract. Tantilla hendersoni Stafford, 2004 was described based on a single female specimen from Cayo District, Belize, and is the only snake species considered to be endemic to the country. We report the discovery of a second specimen, the first male, of Tantilla hendersoni from a new locality in Stann Creek District, and provide a detailed morphological description of the specimen. We also discuss the distribution, conservation, and taxonomic status of the species. Keywords: Tantilla hendersoni, Belize, Centipede snake, Central America, Stann Creek District