Based on partial sequences of three mitochondrial (cox1, cox2, trnL) and two nuclear genes (18S and 28S) we conducted a molecular phylogenetic analysis of Prionoceridae represented by all three valid genera, 34 species and a large number of informal species groups from the Palaearctic, Afrotropical and Oriental regions. Analyses indicate the split of Prionoceridae in two main clades, Lobonychinae and Prionocerinae. Lobonychinae includes the genus Lobonyx Jacquelin du Val, 1859 and some species currently placed in Idgia Laporte de Castelnau, 1838. Prionocerinae includes a large paraphyletic grade of Idgia and monophyletic Prionocerus Perty, 1831, with Idgia viridescens Gorham, 1895 identified as a sister group to Prionocerus. Idgia consists of seven clades, with their basal relationships weakly resolved. Two clades – Idgia oculata and Idgia pallidicolor species groups – are well supported by molecular data and morphological characters. Species identifications based on morphology are consistent with tree topology recovered from molecular dataset, with one possible exception (Idgia inapicalis). Sequence divergence in cox1 varies from 3.7 to 16% between species and from 0 to 4.9% within species of Prionoceridae. The reconstruction of diurnal and nocturnal life histories suggests a single origin of nocturnality, and multiple transitions from nocturnal to diurnal life style within Prionoceridae. The African and the Arabian species represent two lineages, both having their origin in tropical Asia.