Both names Adoxini and Bromiini are based upon the same type genus Bromius (syn. Adoxus), so they can't possibly be separate tribes. Even though the name Adoxini is two years older, the name Bromiini was deemed valid by Bouchard et al., 2011, which has since been widely followed.
https://zookeys.pensoft.net/article/4001/list/8/