Kallakurichi , Palani , Dharapuram , Kangeyam , Omalur , Salem , Konganapuram , Sankagiri , Attur , Dharmapuri , Hosur , Krishnagiri , northern Dindigul , western parts of Tiruchirapalli , Perambalur , Vellore and Villupuram . They are also sparsely distributed in Thanjavur , Madurai and Theni districts of