A rare complete set in mixed bindings. Field Museum Zoological Series Volume XIII. Part I - XI published in 15 separate installments, 1918 - 1949. Part I, Nos. 1-4; Part II, Nos. 1-2; and Parts III-XI in individual volumes. Part I, Nos. 1-4 and Parts VI - XI in worn original wrappers. Part II, Nos. 1-2 and Parts III-V bound in red buckram. Hellmayr the first author on most volumes but Cory on Part II, No. 1, the first volume published in 1918. 'An inispensable work treating in all (according to Peters) 1,311 genera, 4,227 species, and 8,896 subspecies.' Mengel