Hi Rafa,
1. If there are two nests one next to the other and one is been parasitized by a cuckoo wasp, and from both they emerge wasps in the next days, I assume both are the same species. It would be very rare they rear different species. ¿Or not?
Not necessarily,
different species may deposit an egg in the same nest and even in the same cell. In literature there are records of cuckoo wasps first instar larva that after emerging first kills other parasitoid larvae (including cuckoo wasps) deposited in the nest and then move to the stored prey or the host larva.
2. The sternites colour were a bit different from those depicted of C.ignita at Orlovskytė et al 2016. Is it typical of C.bischoffi?
yes, these are typical of
bischoffi3. In this pictures
https://www.biodiversidadvirtual.org/in ... 331.htmlof C.ignita bischoffi, the dorsal part of tergum has also bluish reflections. Is it typical of C.bischoffi?
yes, they are more frequently found with blue to violet reflections on the metasoma.
However, almost all cuckoo wasps (in particular Chrysis of all species groups) from Southern Spain have terga darker, blue to violet, compared to specimens from other parts of Europe.
4. As the 2nd specimen emerged the next day and had different tergum colour, I assumed it could be a female. It was not collected.
That could be ...
Ciao!