The biology of many Darwin wasp (Hymenoptera: Ichneumonidae) species is poorly known. Existing museum specimens can potentially be used to get information on e.g. how live, what they eat, and their life cycle is. One example this a 1991 study by Eggleton in which he measured some rhyssine (Ichneumonidae: Rhyssinae) species, the results deduce likely mate. We extend work measuring five tropical ...