The yellow scorpion Tityus serrulatus is recorded for the first time for the western Rio Grande do Sul State, Brazil. Two specimens were collected in the municipality of Uruguaiana (29° 45' 23'' S and 57° 05' 37'' W) in june 2006. The occurrence of specimens of T. serrulatus in Rio Grande do Sul represents an increase of 2127km in relation to his known distribution area.
Tityus serrulatus; yellow scorpion; distribution; Rio Grande do Sul