Oniscus asellus. Rock Creek Park, Washington, DC, USA
Certainly matches the description and images from BugGuide. Would be nice to have some kind of comprehensive list for CT or New England, though.
The size of of a raisin. Has two antennas and black looking shell that has white spot on it.
Small brown bugs
Soft grey underbelly
At least 6 legs on each side
Crawling in damp dark dirt
about .75 to 1 cm long and .25 to .5 cm wide
black/grayish with yellow spots on shell
small antennae at front of insect
Oniscidae is a family of woodlice, including the common woodlouse Oniscus asellus. Six genera are certainly placed in the family (Oniscus, Oroniscus, Phalloniscus, Rabdoniscus, Rodoniscus and Sardoniscus), with eight others included by some sources (Cerberoides, Diacara, Exalloniscus, Hanoniscus, Hiatoniscus, Hora, Krantzia and Tasmanoniscus).