An extraordinarily beautiful beetle. Pocas fotos le hice.
Same nest as:
https://www.inaturalist.org/observations/177784305
Keys to C. cursor, erect hairs on scape and gaster nearly absent compared to C. piliscapa.
piliscapa: https://www.antweb.org/bigPicture.do?name=casent0911106&shot=h&number=1
cursor from s. France: https://www.antweb.org/bigPicture.do?name=casent0106260&shot=h&number=1
Seems to be the known disjunct population of C.cursor found northwest of Madrid, separated from the France population. Mitochondrial analysis indicates it may be a separate species:
https://assets.researchsquare.com/files/rs-3013514/v1_covered_49badf57-856b-4056-9167-b5a9cf51e460.pdf?c=1686032146
https://www.sciencedirect.com/science/article/pii/030519789090036F