The only extant choliambic line by Cinna, comparing some action to a Psyllus doing something to an asp, is preserved by Aulus Gellius to illustrate that the adjective somniculosus can have the causative sense ‘sleep-inducing’ as well as the active one of ‘sleepy’. If Gellius is correct, then the simile’s missing verb is likely to have one of the Psylli, famed for their ability to lull snakes to sleep, doing just that to a ‘sleep-inducing asp’. The situation which would be compared to this must be that of someone receiving a taste of their own medicine. This would also account for the Psyllus’ imprecise epithet Poenus, which would pun on poena. If Gellius is wrong, and somniculosus means ‘sleepy’ as in almost all other instances in Latin, the combination of snake and sleep imagery, which can be paralleled separately in other texts, with the abusive choliambic metre might suggest that what is being compared to the asp is the flaccid penis of an impotent man.