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