I have never seen this species, except the couple from Arabia Felix in the Berlin Museum, described by Klug, Symb. Phys., iv., pl. 35, f. 2 and 3. Rambur, p. 369, No.5, described the species after Klug's figures, Rambur and others, not excepting myself, believed that the male did not belong to the same species as the female. Klug calls it a variety. After a thorough study of the species in Berlin, I arrived at the conclusion that Klug was right, and P. cephalotes Klug shows a similar but not so exaggerated differnce between both sexes. I have carefully compared the types with the figures, and found them to be very exact.