They range in size from  and are blackish or reddish-brown in colour, without prominent markings, and often rather hairy ventrally.
ðeɪ ɹˈeɪndʒ ɪn sˈaɪz fɹʌm ænd ɑːɹ blˈækɪʃ ɔːɹ ɹˈɛdɪʃbɹˈaʊn ɪn kˈʌlɚ, wɪðˌaʊt pɹˈɑːmɪnənt mˈɑːɹkɪŋz, ænd ˈɔfən ɹˈæðɚ hˈɛɹi vˈɛntɹəli.