[2615.] Varro and Catullus ([25]) employ a form of the Septenarius which conforms more closely to Greek models, keeping the arses of the even feet pure and rarely admitting resolutions. There is regularly a diaeresis after the fourth foot. The scheme is:—
⏑͐ –́ | ⏑ –̇ | ⏑͐ –́ | ⏑ –̇ # ⏑͐ –́ | ⏑ –̇ | ⏑͐ ⏗́ –̇
or anacrustically ([2529])
⏑͐ ⁞ –́ ⏑ | –̇ ⏑͐ | –́ ⏑ | –̇ ‖ ⏑͐ | –́ ⏑ | –̇ ⏑͐ | ⏗́ | –̇ ⌃
[2616.] Catullus does not admit resolutions at all, save in one very doubtful case ([25, 5]). Varro seems to admit them in the first foot only.
[Iambic Dimeter Acatalectic (or Quaternarius).]
[2617.] The Iambic Dimeter Acatalectic consists of two complete iambic dipodies or four iambic feet. In the first three feet the tribrach, irrational spondee, irrational dactyl and cyclic anapaest are admitted; but the proceleusmatic is very rare, except in the first foot of the Versus Reizianus ([2625]), (of which a Quaternarius forms the first colon). The scheme for substitution is:
| ⏑͐ –́ | ⏑͐ –̇ | ⏑͐ –́ | ⏑ –̇ |
| ⏑ ⏑́ ⏑ | ⏑ ⏑̇ ⏑ | ⏑ ⏑́ ⏑ | |
| > ⏑́ ⏑ | > ⏑̇ ⏑ | > ⏑́ ⏑ | |
| ⏖ –́ | ⏖ –̇ | ⏖ –́ | |
| [⏖ ⏑́ ⏑] | [⏖ ⏑̇ ⏑] | ⏖ ⏑ ⏑́ ⏑] |
Examples are:
Rogitā́|re quasi | diffíci|le sit