Thelgetra adusta is a species of beetle in the family Cerambycidae. It was described by Hermann Burmeister in 1865.Bezark, Larry G. A Photographic Catalog of the Cerambycidae of the World. Retrieved 22 May 2012. It is found in Brazil (Mato Grosso do Sul, São Paulo, Paraná, Santa Catarina, Rio Grande do Sul), Bolivia (Cochabamba), Paraguay, Argentina (Tucumán, Santiago del Estero, Santa Fé) and Uruguay.
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