The notes of W. S. Maguinness on the Corpus Tibullianum contain several things which strike me as either true or at least highly plausible. In the above passage, however, I think both he and Postgate have missed the point of the first word. Tibullus has been telling the story of how Apollo turned herdsman for love's sake. He insists several times over that it is a story, not a thing he can vouch for. The infinitives in 14 a-c make it sufficiently evident that the lost pentameter began with fertur or dicitur; in 18, Artemis dicitur to have blushed for her brother's unseemly occupation; in 29, fertur that the gods used to serve Venus openly. The same line reminds us that these stories refer to old days, olim. Now comes the couplet in question.