Mammalia 2017; 81(2): 211–215 *Corresponding author: Matthew J. Struebig, Durrell Institute of Conservation and Ecology, School of Anthropology and Conservation, University of Kent, Canterbury, CT2 7NR, UK, e-mail: m.j.struebig@kent.ac.uk. http://orcid.org/0000-0003-2058-8502 Joe Chun-Chia Huang: Department of Biological Sciences, Texas Tech University, Lubbock, Texas 79409, USA Nor Zalipah Mohamed: School of Marine and Environmental Sciences, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia Sephy Noerfahmy: Fauna and Flora International Indonesia Programme, Komplek Universitas Nasional Blok 1 lt. 4, Jakarta, Indonesia Caroline R. Schöner and Michael G. Schöner: Zoological Institute and Museum, University of Greifswald, J.-S.-Bach-Str. 11/12, 17489 Greifswald, Germany Charles M. Francis: Environment Canada, Canadian Wildlife Service, National Wildlife Research Centre, Ottawa, Ontario, Canada K1A 0H3 Short Note Matthew J. Struebig*, Joe Chun-Chia Huang, Nor Zalipah Mohamed, Sephy Noerfahmy, Caroline R. Schöner, Michael G. Schöner and Charles M. Francis Forest surveys extend the range of the Krau woolly bat (Kerivoula krauensis) in the Malay-Thai Peninsula, Borneo and Sumatra DOI 10.1515/mammalia-2015-0114 Received July 1, 2015; accepted January 14, 2016; previously published online March 4, 2016 Abstract: Kerivoula krauensis was formally described in 2007 and until recently was only known from tropi- cal forest in central peninsular Malaysia. We report four new records, which, together with recent published col- lections, extend the known range for this species to peat- swamps, lowland and montane forests in Borneo and Sumatra (Brunei and Indonesia), and further north on the Malay peninsula, including Thailand. External body measurements and cranial data match well with those from the type locality, although echolocation call para- meters differ – most likely due to technological improve- ments in recording devices. The species remains patchily distributed and rarely encountered, despite substantial sampling effort. Keywords: Kerivoulinae; range extension; Southeast Asia; tropical forest; Vespertilionidae. The woolly bats of the genus Kerivoula are a group of vespertilionids distributed across the African and Asian tropics and subtropics, and are represented by 15 cur- rently recognised Asiatic species (Bates et al. 2004, Simmons 2005, Bates et al. 2007, Francis et al. 2007). Kerivoula species are characterised by their long woolly fur, funnel-like ears and elongated rostrum (Francis 2008). Most species are considered forest specialists, using high-frequency and broad-band echolocation calls that are adapted for prey detection and sensory percep- tion within dense and cluttered vegetation (Kingston et al. 1999, Schmieder et al. 2010). Historically, the taxonomy, ecology and distribution of this group were poorly documented, and most Keriv- oula species were considered rare or difficult to capture. With renewed bat research efforts in Southeast Asia since the 1990s, however, it is now increasingly routine to utilise harp traps in forest surveys (Francis 1990, Kingston et al. 2003), and as a result some Kerivoula species are now known to be amongst the most frequently encoun- tered bats in rainforest assemblages (Kingston et al. 2003). Three new Asiatic Kerivoula have been described in the last decade (Bates et al. 2004, Bates et al. 2007, Francis et al. 2007), the most distinctive of which is the Krau woolly bat, Kerivoula krauensis (Francis et al. 2007). Kerivoula krauensis (Francis et al. 2007) was first cap- tured in 1991 at Kuala Lompat (3°42′54″ N, 102°16′78″ E), in Krau Wildlife Reserve, peninsular Malaysia, but was not formally described as a species until 2007. External discriminating characters from other taxa included dis- tinctive pelage colour (dark brown with shiny golden tips) and minor dental differences, though external and cranial measurements overlapped substantially with other small Kerivoula. However, genetic analyses confirmed around 11% divergence from other congeners making it a clear separate taxon, and one that is recognisable from the distinctive pelage coupled with external measurements (Francis et al. 2007). The formal description is based on