Abstract
It has been suggested that palms of the genus Arenga (Arecales: Arecaceae) or forms close to it were distributed in the Eocene of North America and Europe. Records of Metrioxenini (Belidae), which are monophages on these palms, confirm this assumption. A new species, Succinometrioxena andrushchenkoi Legalov, sp. n. from Baltic amber is described. The new species differs from S. poinari Legalov, 2012 in the smaller body sizes, elytral punctation larger than the distances between them, and a rostrum weakly curved in females. It is distinguished from S. bachofeni Legalov, 2013 and S. attenuata Legalov et Poinar, 2020 by the forehead lacking horn-like tubercles on either side of the eyes. A description of male of S. poinari was herein compiled for the first time. A list and key to fossil Metrioxenini were given. The modern and fossil distribution of the tribe Metrioxenini and Arenga palms was shown.