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Fig. 7. A, B in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 7. A, B. Didymoceras nebrascense (Meek and Hayden, 1856a). USNM 482429, USGS locality D1422 (fig. 2, loc. 13). Figures are ×1.

Fig. 3 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 3. Restoration of Didymoceras nebrascense (Meek and Hayden, 1856a). Stipple board drawing by John R. Stacy. Figure is reduced ×0.90.

Fig. 21 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 21. Didymoceras stevensoni (Whitfield, 1877). A. USNM 482445, USGS Mesozoic locality D1498 (fig. 2, loc. 56). B. USNM 482446, USGS Mesozoic locality D3789 (fig. 2, loc. 50). Figures are ×1.

Fig. 2 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 2. Index map of part of the Western Interior of the United States showing localities of heteromorph ammonites described or mentioned in the text. Numbers refer to USGS Mesozoic localities listed in appendix 1.

Fig. 18 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 18. Index map of part of the Western Interior of the United States showing localities of Didymoceras stevensoni (Whitfield, 1877). An x may indicate one or several nearby localities. Numbers refer to USGS Mesozoic localities mentioned in the text. Dashed line marks the approximate position of the western shoreline of the Western Interior Seaway during D. stevensoni zone time.

Fig. 6 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 6. Didymoceras nebrascense (Meek and Hayden, 1856a). A. USNM 482427, USGS Mesozoic locality D1421 (fig. 2, loc. 12). B. USNM

Fig. 12. A, B in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 12. A, B. Didymoceras nebrascense (Meek and Hayden, 1856a). USNM 482433, USGS Mesozoic locality D1422 (fig. 2, loc. 13). Figures are ×1.

Fig. 9. A, B in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 9. A, B. Didymoceras nebrascense (Meek and Hayden, 1856a). YPM 6131A, plaster cast of Hyatt's (1894) second specimen described as Emperoceras beecheri, Pierre Shale near Buffalo Gap, S. Dak. Figures are ×1.

Fig. 8. A, B in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 8. A, B. Didymoceras stevensoni (Whitfield, 1877). BHMNH 4039, collected by Howard Ehrle, Pierre Shale of Carter County, Mont. C, D. Didymoceras nebrascense (Meek and Hayden, 1856a). C. USNM 482430, USGS Mesozoic locality D85 (fig. 2, loc. 23). D. YPM 6131B, plaster cast of one of two specimens described by Hyatt (1894) as the new genus and species Emperoceras beecheri, Pierre Shale near Buffalo Gap, S. Dak. Figures are ×1.

Fig. 11 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 11. Didymoceras nebrascense (Meek and Hayden, 1856a). A, B. USNM 482432, USGS Mesozoic locality D2148 (fig. 2, loc. 10). C. USNM 450333, USGS Mesozoic locality D1422 (fig. 2, loc. 13). Figures are ×1.

Fig. 17 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 17. Part of the external suture of Didymoceras stevensoni (Whitfield, 1877). E is the external lobe and L is the lateral lobe. The heavy, straight line marks the middle of the venter. USNM 482436, USGS Mesozoic locality D4446 (fig. 2, loc. 47).

Fig. 15. A–C in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 15. A–C. Three views of the holotype of Helicoceras stevensoni Whitfield, 1877 (from Whitfield, 1880: pl. 14, figs. 5–7). Figures are

Figs 181-183 in Aulacidae of the southwestern United States, Mexico, and Central America (Hymenoptera)

Figs 181-183: Pristaulacus annulatus. 181 Head and anterior mesosoma, dorsal. 182 Mesosoma, lateral. 183 Mesosoma, dorsal. Note: Figures taken with another photomicroscope and not of similar quality as other figures; specimen not reborrowed for further pictures.

Figs 169-172 in Aulacidae of the southwestern United States, Mexico, and Central America (Hymenoptera)

Figs 169-172: Pristaulacus totoferrugineus. 169 Head, front. 170 Head, dorsal. 171 Mesosoma, lateral 172 Mesosoma, dorsal.

Figs 164-168 in Aulacidae of the southwestern United States, Mexico, and Central America (Hymenoptera)

Figs 164-168: Pristaulacus mexiuni. 164 Head, front. 165 Head, dorsal. 166 Mesosoma, lateral. 167 Mesosoma, dorsal. 168 Lateral.

Figs 158-163 in Aulacidae of the southwestern United States, Mexico, and Central America (Hymenoptera)

Figs 158-163: Pristaulacus parkeri. 158 Head, front. 159 Head, dorsal. 160 Head, lateral. 161 Mesosoma, dorsal. 162 Mesosoma, lateral. 163Vorewing.

Figs 152-157 in Aulacidae of the southwestern United States, Mexico, and Central America (Hymenoptera)

Figs 152-157: Pristaulacus ruficruris. 152 Head, front. 153 Head, dorsal. 154 Head and anterior mesosoma, lateral. 155 Mesosoma, dorsal. 156 Mesosoma, lateral. 157 Wings.

Figs 148-151 in Aulacidae of the southwestern United States, Mexico, and Central America (Hymenoptera)

Figs 148-151: Pristaulacus rufitarsis. 148 Head, front. 149 Head, dorsal. 150 Mesosoma, lateral 151 Mesosoma, dorsal.

Figs 136-139 in Aulacidae of the southwestern United States, Mexico, and Central America (Hymenoptera)

Figs 136-139: Pristaulacus omninoniger. 136 Head, front. 137 Head, dorsal. 138 Mesosoma, lateral. 139 Mesosoma, dorsal.

Figs 140-143 in Aulacidae of the southwestern United States, Mexico, and Central America (Hymenoptera)

Figs 140-143: Pristaulacus townesi. 140 Head, front. 141 Head, dorsal. 142 Mesosoma, lateral.143 Mesosoma, dorsal.