Bulletin - United States National Museum . angle shows the effect of a sheetof quartz mm. thick placed between the wings and the plate. 2. Argynnis cybele, right wings of the same specimen, upper surface; the dark circle cutting both wings shows the effect of a thin coverglass placed between the wings and the plate, and the dim bandrunning diagonally across the fore wings is caused by a strip ofcellophane placed between the wing and the plate. 3. Argynnis idalia, female, fresh specimen, upper surface (compare pi. 13, fig. 1) ; the circular excision in the hind wing shows the effectof a thi
Bulletin - United States National Museum . angle shows the effect of a sheetof quartz mm. thick placed between the wings and the plate. 2. Argynnis cybele, right wings of the same specimen, upper surface; the dark circle cutting both wings shows the effect of a thin coverglass placed between the wings and the plate, and the dim bandrunning diagonally across the fore wings is caused by a strip ofcellophane placed between the wing and the plate. 3. Argynnis idalia, female, fresh specimen, upper surface (compare pi. 13, fig. 1) ; the circular excision in the hind wing shows the effectof a thin cover glass inserted between the wing and the plate;the dim band crossing both wings shows the effect of a strip ofcellophane; and the short irregular band cutting both whigs abovethe cover glass shows the eftect of a piece of quartz ground toa thickness of mm. 4. Argynnis idalia, right wings of the same specimen, upper side; the broad dim band shows the effect of a strip of U. S. NATIONAL MUSEUM BULLETIN 157 PLATE 61. Contact Pictures U. S. NATIONAL MUSEUM BULLETIN 157 PLATE 62
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
