Need I say that the mystery insects were LoveBugs?
These common springtime insects aren’t true bugs but flies in the family Bibionidae. The pictured pair belong to the genus Bibio.
8 points to Ainsley for the family and genus. 5 to JasonC for identifying the character that pegs these as Bibio (the tibial spines), 2 to Gunnar for extra morphological detail, and 1 point to Josh King for his enthusiam for lovebugs.