Rennes, Oberthür et fils, 1876. 4to (27.9 x 18.8 cm). 74 pp.; four nice hand-coloured engraved plates. Slightly later half cloth over marbled boards. Dark green morocco strip with gilt title mounted on spine. Original printed wrappers preserved.

Rare first volume of the Études, of which 21 volumes were published. This, however, is the only part in this series, specifically dealing with the butterflies of Algeria. More than a quarter century later, from 1904 onwards, additional studies on North-African Lepidoptera were written and published by Oberthur in his Études de lépidopterologie comparée. This early work contains descriptions and very fine illustrations of new and little known species. A nice, clean copy. Horn-Schenkling II(3), p. 202; Nissen ZBI, 2997.