https://www.mapress.com/pe/article/view/palaeoentomology.3.6.16
Fleas are parasitic scorpionflies | Palaeoentomology
fleasparasiticscorpionflies
https://mdc.mo.gov/discover-nature/field-guide/common-scorpionflies
Common Scorpionflies | Missouri Department of Conservation
Male scorpionflies will make you look twice, because the abdomen is tipped with what looks like a scorpion stinger! These nifty insects cannot sting, however.
department ofcommonscorpionfliesmissouriconservation