"1. Lower mandible. 2. Upper mandible. 3. Forehead. 4. Loral space. 5. Crown of the head. 6. Hind part…
"The annexed figure explains the nomenclature of most of the outward of a Bird, but some further explanations…
"Fig. - 20 - Two barbs, a, a, of a vane, bearing anterior, b, b, and posterior, c, barbules; enlarged;…
"Fig 181 - Generic details of Hirundo horreorum(Barn Swallow) Deep lustrous steel-blue; forehead and…