Consult this volume for examples. First-order headings are written in capital letters on a separate line and are separated by two double spaces from the preceding paragraph. Second-order headings are written in capital and lower case letters on a separate line flush with the left margin and are separated from the preceding paragraph by two double spaces. Third-order headings are written in capital and lower case letters indented as in a normal paragraph and followed by a period. Third-order headings should be in boldface type.
Text immediately follows a third-order heading.
Do not use more than three orders of headings. Examples of the three orders described are illustrated by these Instructions. Systematics sections begin with modified first-order headings, described below. Citations Follow the examples given here to cite previously published articles, illustrations, and unpublished data, respectively. Plate 1, fig.