Key to Cotesia species in Reunion

1 Mesosoma distinctly flattened, 1.7–1.8x as long as high; antenna of female short and stout, distinctly shorter than body..... 2

– Mesosoma not distinctly flattened, 1.3–1.4x as long as high; antenna of female slender, about as long as body............ 3

2 Hind coxa yellow or yellowish-orange..................................................... C. flavipes Cameron

– Hind coxa brownish-testaceous......................................................... C. sesamiae (Cameron)

3 Tergum 3 finely and sparsely punctate (Fig. 8 f)................................................ C. xavieri sp. nov.

– Tergum 3 smooth..................................................................................... 4

4 Scutellum coarsely punctate-rugose (Fig. 8 b), tergum 2 sparsely setose on most of its surface (Fig. 7 c)... C. plutellae Kurdjumov

– Scutellum densely punctate, punctuation anteriorly sparser with smooth inter-puncture areas visible (Fig. 8 c), tergum 2 with some hairs along apical margin (Fig. 7 e).................................................... C. ruficrus Haliday