Spanish spoken in Mexico City is influenced considerably more by indigenous dialects than by archaic or present usage of peninsular Spanish. Six areas in particular fall under this influence: (1) the phoneme "s", treated as a palative and fricative sound, (2) voiced "s", which is dental alveolar and affricate, (3) "t" in liaison with "l", articulated as a plosive, (4) a final "r", voiced as an implosive and vibrant sound, (5) a lapse in tonic and atonic vowels, and (6) a prolonged and tense articulation of "s", especially in final position. (DS)