The head morphology of Platydracus femoratus (Fabricius, 1801), representative of the Staphylininae, and Oxyporus stygicus Say, 1834, representative of Oxyporinae are presented. The analysis of mandibles, maxillae, labrum-epipharynx and labium-hypopharynx through scanning electron microscopy (SEM) are shown in detail regarding the external morphology. The analysis of the tentorium and the hypopharynx and prementum sclerites through 3D reconstruction of Synchrotron X-ray microtomography (SR-µCT) scans are shown in detail regarding the internal morphology. The scope of this project is to provide a comprehensive general survey of the external and internal head morphology of various monophyletic subfamilies previously assigned to the traditional Staphylinine group. In addition to the study of sclerotized parts, the project will also cover the head musculature, providing the points of origin of insertion of the muscles inside the head capsule. These results are part of a larger project that will count with the same methodology applied herein for other 34 species of the Staphylinine group. By comparing both the external mouthparts and the internal head morphology of species covering the major clades among the Staphylinine group, we aim at interpreting the functional head morphology on the basis of a phylogenetic scheme of this group. The study of the head and mouthparts morphology of modern Staphylinidae has been neglected so far, and the aim of this project is also to provide such information for a better understanding of the higher-level classification of the Staphylinine group.