A new species of gymnophthalmid lizard with reduced members (genus Bachia) is described after three specimens obtained at Cáceres (16º10'S, 57º41'W), in the State of Mato Grosso, western Brazil. Specimens were found under or inside rotting logs in forested or partially disturbed areas and are primary associated to the so called "cerradão" vegetation. Bachia cacerensis sp.n., belongs to the "bresslaui" group and is characterized by the unique dorsal color parttern, with seven longitudinal dark lines on a cream ground color; 49-51 transverse dorsal scale rows; 35 scales around midbody; 38 longitudinal ventral scale rows. Anterior limbs generally with four unharmed apical scales, resembling toes; posterior limbs with a single, unharmed apical scale. A specimen of Bachia dorbignyi (Duméril & Bibron, 1839) collected at the municipality of Jauru (15º14'S, 58º44'W), near Cáceres, is also described. In the Brazilian territory, B. dorbignyi has been previously recorded only for the State of Rondonia.
Gymnophthalmidae; Bachia cacerensis; new species; Bachia dorbignyi; new record; western Brazil