Had no idea that this intriguing critter was a crab spider when I photographed it. Trying to figure out, is this T. angulatus, or T. rubromaculatus? The main ID reference on this genus, Gertsch 1939, gives a few characters which are tough to apply, as all of them are relative of one species to another (more vs. fewer black spots, and larger vs. smaller; leg spines more or less robust; femur 1.5 times the carapace length, or more than 1.5)

Update: species ID of angulatus supported by Aaron McKee, in the FaceBook group "Insects and Spiders of New England", mostly citing "The Spiders of Connecticut" (via the World Spider Catalog).

Interesting observation: of the observations (including this one) here on the Guide of a Tmarus sp. with prey, roughly half show the prey as an ant, mostly carpenters. Atypical for a Thomisid.