Stink Bug sp. - Andrallus spinidens
Virginia Key (east of downtown Miami), Miami-Dade County, Florida, USA
July 26, 2017
Laying eggs? On inaturalist: http://www.inaturalist.org/observations/7243483
Rudyard (on inaturalist) pointed out that it looks like Andrallus, I checked the images and it does look like a match for the single species under Andrallus (Andrallus spinidens).