Thirty-two species of the families Withiidae and Cheliferidae are recorded from Kenya. One genus and six species of Withiidae and four species of Cheliferidae are described as new, the withiid genusPycnowithiusand the cheliferid genusBeieriusare recorded for the first time from East Africa. The speciesAllowithius crassusBeier 1935 andA. somalicus majorBeier 1935 are considered as junior synonyms ofWithius somalicus(Beier 1932),Beierius walliskewi gracilisBeier 1955 is sunk into synonymy ofB. walliskewi legrandi(Vachon 1938). The status of the withiid generaStenowithius, NannowithiusandXenowithius(which is considered as junior synonym ofWithius) is commented. An artificial identification key is proposed for the Kenyan species of those two families.