A description is given of both male and female of a new species of phlebotomine sand fly caught in rock crevisses in Grão Mogol, State of Minas Gerais, Brazil. The male is characterized by presenting the style with five spines and a branched paramere. The female is superficialy similar to the females of the subgenus Lutzomyia s. str., but has very short ascoids and very small spines on the posterior part of the pharynx. The new species is included in the "aberrant and isolated species" group of Martins, Williams and Falcão (1978). The description of the female of Lutzomyia (Lutzomyia) alencari Martins, Souza e Falcão, 1962, collected on the same region, is also presented.