Sclerodermus macrogaster on finger
Wasps in the genus Sclerodermus, such as this Sclerodermus macrogaster specimen submitted to Penn State University’s entomology extension service, are small (1.5 to 6 millimeters in length) and often wingless, which makes them easily mistakable for ants to the untrained eye. (Image originally published in Skvarla 2018, Journal of Medical Entomology)