 The biting it does in line 4 ties in with Catullus 8, line 18 ("cui labella mordebis").A key question concerns the unity of this poem.In the copies derived from the original V manuscript, poems 2 (lines 1-10 below), 2b (lines 11-13 below), and Catullus 3 appear as one poem under the title "Fletus passeris Lesbie" (Lament for Lesbia's Sparrow).