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The products of the components ϕaα of a spinor iso-spinor (a = 1, 2 ; α = 1, 2, 3, 4) are the components of tensors réductible for the groups of Lorentz L↥, Pauli-Gürsey, and Touschek. We make the reduction for the case where the ϕaα anticommute. The results are summarized in the final table. Each irreductible tensor isotensor is characterized by three numbers : the baryonic number tB, the isospin t and the indices p/2, q/2 of the L↥ representation Dp/2, q/2, Géhéniau Jules,Nuyts Jean. Tenseurs isotenseurs. In: Bulletin de la Classe des sciences, tome 46, 1960. pp. 826-833.