Metriopelma zebratum = junior synonym of Davus ruficeps per Gabriel (2016) who examined all relevant type material.

Full reference:

Gabriel, R. 2016. Revised taxonomic placement of the species in the Central American genera Davus O. Pickard-Cambridge, 1892, Metriopelma Becker, 1878, and Schizopelma F. O. Pickard-Cambridge, 1897, with comments on species in related genera (Araneae: Theraphosidae). Arachnology 17(2): 61-92. doi:10.13156/arac.2006.17.2.61

World Spider Catalog:

http://www.wsc.nmbe.ch/reference/13510