Hemiprocne mystacea -- Mustached Treeswift. Alternate name on piece: Dendrochelidon mystaceus [Bearded tree-swift] Layout drawing, first 2 birds well finished; third, distant, bird very roughly sketched, clipped from another sheet, mounted with two straight pins and touched with watercolor; 6 notes on form and color. Artist's name(s): Gould, John; Richter, Henry Constantine.