Side views of: 21. upper organ; 22. left clasp; 23. right clasp. Image from: Scudder, Samuel Hubbard 1888-89. The butterflies of the Eastern United States and Canada with special reference to New England. Cambridge, Author. 1: xxvi + 766 pp., frontisp.; 2: xii +767-1774, frontisp., figs.; 3: viii + 1775-1958, frontisp., pls. 1-89, 3 maps. [published in 12 parts from November 1888 to October 1889]; pl. 36 f. 21-23

Side view of end of right clasp, with inner view of tip of left clasp. Image from: Scudder, Samuel Hubbard 1888-89. The butterflies of the Eastern United States and Canada with special reference to New England. Cambridge, Author. 1: xxvi + 766 pp., frontisp.; 2: xii +767-1774, frontisp., figs.; 3: viii + 1775-1958, frontisp., pls. 1-89, 3 maps. [published in 12 parts from November 1888 to October 1889]; pl. 36 f. 33

Image from: Lindsey, Arthur Ward, Ernest Layton Bell and Roswell Carter Williams, Jr. 1931. The Hesperioidea of North America. Denison University Bulletin 26: 1-142, pls. 1-33 (April); pl. 14 f. 06

Tip of the right clasp, the view from: 1. the side, a little above, and a little behind;4,6. a little further above than in 2; 4. typical form; 6. extreme modification (narrow);3. apex of the right clasp. Tip of the left clasp from: 7. directly the side (as the genitalia are mounted); 8. in front at an angle of about 45°; 9. directly above (as the genitalia are mounted). 10. complete genitalia from below showing the angle at which the clasps in each instance were mounted. 11,12. apical half of right and left clasps respectively (after Scudder, Samuel Hubbard 1888-89. The butterflies of the Eastern United States andCanada with special reference to New England. Cambridge, Author. 1: xxvi + 766 pp., frontisp.; 2: xii +767-1774, frontisp., figs.; 3: viii + 1775-1958, frontisp., pls. 1-89, 3 maps. [published in 12 parts from November 1888 to October 1889]).Image and caption with modifications from: Cook, John H. 1905. On the specific validity of Thanaos ausonius.Journal of the New York Entomological Society 14(3): 125-128, pl. 3. {Sep 1905};pl. 3 f. 1, 3, 4, 6-12

Tip of the right clasp, the view from: 2. the side, a little above, and a little behind;5. a little further above than in 2.Image and caption with modifications from: Cook, John H. 1905. On the specific validity of Thanaos ausonius.Journal of the New York Entomological Society 14(3): 125-128, pl. 3. {Sep 1905};pl. 3 f. 2, 5

Drawing published in: Scott, James A. 1986. Butterflies of North America, a natural historyand field guide. Stanford; Stanford University Press: xv +583 pp., 64 pls., 71 figs. 2 tbls., maps. {[26 Sep]};f. 71 #648