Catocala caterpillar nabs attention on iNaturalist

Well, not a LOT of attention. But some on iNaturalist! Most notably by Larry Gall, a systematist and field biologist in Connecticut who works at Yale University's Peabody Museum as the senior collections manager for the entomology department. I posted this observation in April 2020 and only took one photo. I think we had an abundance of caterpillars that spring so I didn't take multiple pictures of just one. 

From what I'm gleaning from the conversation posted to this observation, this caterpillar could be the larva of one of two species – Catocala delilah or C. desdemona. Few larvae of both species have been documented. I've been asked to rear one if I ever see this caterpillar again, which I'll gladly do given I have some guidance. 

Here's a cool guide that Gall and his colleagues have compiled: Underwing Moths (Catocala) & Larvae: A companion guide for iNaturalists.