Rabat, Institut Scientifique Chérifien, 1930. 8vo (25.2 x 16.3 cm). Half-title, title page, 206 pp.; 115 text illustrations. Original printed wrappers.

Written by the French dipterologist Eugène Séguy; describing nearly 500 species of flies, mosquitos and other dipterids, including several new species. Uncut. Stamp on title and blank endpaper, circular label with handwritten number on front wrapper and spine foot, otherwise clean. A very good copy. Very scarce.