Found under a light high on a wall about 10:30 p.m. It looked very fresh and unworn. After several tries, I was able to bring it down to the sidewalk for photography. Length (35 mm) was measured by photographing adjacent to a scale, and is given from front of mandibles to tip of folded wings. Looking at the abdomen in hand, I'd say mandibles to tip of abdomen length was about 25 mm or slightly more. This species seems to be rather smaller than the summer-flying C. pectinicornis.
Images in this series updated 28 April 2021 from original files--size and processing enhanced.

The pectinate antennae indicate this is a male. Female of this species has serrate antennae.