Last instar larvae of a Photinus pyralis firefly. Raised in the lab from mated pairs from Summer 2017. About 3 cm long. Note how it looks like other tribe Photini larvae (e.g. genera Ellychnia & Lucidota)
20:50 in my back garden. Spotted first flashing Photinus from my deck. No photos as it's dark and I was showering;
69* F night. Drawn to deck lights. Unlike earlier firefly, slightly smaller & stayed.