The paper discusses the geographical distribution of the monophthongisation of (1) the diphthong [ei] (< [e:ç]) before the palatal fricative [ç] (i.e. [eiç > i:ç]) and (2) the diphthong [ou] (< [o:×]) before the velar fricative [×] (i.e. [oux > u:x] in words like