A description of the larvae of two Tenebrionid beetles, which are strictly confined to the dunes of the desert, may serve as a contribution to our knowledge of the manifold life of the Namib Desert. They belong to two different tribes, the Adesmiini and Eurychorini, and this account, together with the keys of genera and species as so far known and more especially the illustrations, may assist in their classification and add to the knowledge of Tenebrionid larvae in general. All larvae dealt with in this paper were hitherto unknown. This paper is confined to the larvae; pupae will be dealt with in a later publication.