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Platymetopius verae, a new species of Deltocephlinae living on the mountains of north-eastern Sicily and on Etna, is described. The new species belongs to undatus group; it is distinguishable from all other species of the group by the yellow-green colour pattern of the body, the shape of aedeagus, of the lamellar expansions on the appendages of the pygofer of the male and the 7th sternum of the female.

The 5 immature stages of Matutinus putoni (Costa, 1888) are described and illustrated and a key to recognize the five instars is given. Some notices about the biology of this species, obtained by laboratory rearing and by observations in the field, are also given.