An analysls of S.arcop.t.es scablel (Acartdtda: Sarcoplldae) mita popula¡ons was performed in a patient that suffered Norwegian scabies. He had lesions on back-buttocks, right thigh, left armpit, right hand left etbot. We found all types of m¡te evotutive forms in each lesion place. The back was the anatomic place that had the highest density of mite evolutive forms (p < 0,01).