Aureli: see Intr. 37, Intr. 41. If not an intimate and warm friend, Aurelius must have been at this time on good terms with Catullus, or Juventius would not have been entrusted to his care. And, allowing for traditional grossness of language (cf. Intr. 32), there is no tone of unfriendliness in this poem. But Aurelius (and his friend Furius; cf. Catul. 23.1 and Catul. 24.1) betrayed the trust, and from this occasion dates the enmity of Catullus toward them.
 nostrum caput: i.e. nos (= me), but with a more definite reference to peculiar and cherished interests; cf. Catul. 68.120 “caput seri nepotis” (= serum nepotem); Pl. Capt. 946 “propter meum caput” Hor. Carm. 1.24.2 “tam cari capitis;” Hor. S. 2.5.94 “cautus uti velet carum caput” ; Prop. 2.8.16 “in nostrum iacies verba superba caput.”
 te: accusative of exclamation