Pp. 274, 289, 9 full page plates; 255; 303; 232; 246; 428; 405; 270; 334; 330; 349, 84 full page photo plates, half-tones and line drawings; 14 (corrigenda for all parts). Later cognac-brown cloth, spine gilt-lettered, lg 8vo. A massive reference work of 3,200 pages that presents keys to all the genera of the Diptera. Though published in Brazil, the text is entirely in English. Rare work, seldom offered. 12 parts bound in 4 volumes.