The last larval stage of Heliotaurus ruficollis Fabricius, 1781 (Tenebrionidae: Alleculinae, Omophlini), a subterranean detritivore, is described in detail. The larva of H. ruficollis has the distinguishing characters of the subfamily Alleculinae and the tribe Omophlini, and it may be distinguished from the larvae of Omophlus species by the more rounded apex of tergum 9 and the fact that the ventral portion of tergum 9 is at the same level than sternum 9.