swamp angel

noun2

1. •
   (slang) A mosquito.

   • “[…] Let's eat lunch before the swamp angels find us.” “Mosquitoes,” Marian translated for her. — 2013
2. •
   (US, slang) A Parrott rifle.

   • On the 17th, the Parrot ^([sic]) "swamp angels" were moved to a position nearer Coosawhatchie bridge, […] — 1873