1911-1912 / 1914. 276, [1], 520, 183, 489 p., several figs, 27, 34 plates, half calf (corners with some wear). End-papers foxed, a few pages with some slight foxing but the majority clean. With ex libri of Lionel George Higgins (1891-1985), a British entomologist specialized in Lepidoptera (author [with Riley] of the much used; ‘’A field guide to the butterflies of Britain and Europe’’).The first two international entomological congresses in nice matching half leather bindings with 5 raised bands, black labels, gilt lettering and lines and some blind-tooled ornaments. Of historical imortance.