Key to the species-groups and unplaced species of Neotropical Xanthopimpla

1 Occipital carina complete and conspicuously developed as a thin, high flange (Fig. 1 b), propodeal spiracle joined to pleural carina by a short carina (Fig. 1 d)................................................... X. amazonica species-group

- Occipital carina incomplete to complete, never developed into a flange (Fig. 1 a), propodeal spiracle not joining pleural carina by a short carina (Fig. 1 d)...............................................................................2.

2 Propodeum with only posterior transverse carina present, triangular crests at mesoscutum small (Fig. 1 c), body almost entirely bright lemon yellow (Fig. 5 d)............................................................ X. peruana Krieger

- Propodeum with posterior transverse and, at least partially, anterior transverse carina present (Fig. 6 a), triangular crests at anterior of mesoscutum highly elevated, body not uniformly bright lemon yellow................... X. aurita species-group