Springfield, or Bobby Got a Shadfly Caught in His Hair Lyrics

Lyric discussion by wanderingmounty 

Cover art for Springfield, or Bobby Got a Shadfly Caught in His Hair lyrics by Sufjan Stevens

Apparently, a shadfly is a kind of mayfly that lives only a few days to reproduce, and then dies. It spend most of its life underwater and a larva. I think the fly is a metaphor for the character, he lived a mundane life, only to advance into a stage where he was consumed only with sex, and his life fell apart.