Found a big one. Length is accurate. Sorry for the bad pics, I'm just lousy at ant photography
1. Location of collection: Ottawa, Ontario, Canada
2. Date of collection : 15 September 2018.
3. Habitat of collection: Urban neighborhood sidewalk
4. Length: 16 mm tip of gaster to mandible. (It's a big one!)
5. Coloration, hue, pattern and texture: As far as my eyes can tell she is all black and shiny
6. Distinguishing characteristics: N/A
7. Anything else distinctive: N/A
Thought it might be one of the larger local Camponotus species as per AntWeb site but when I go down that list all the larger camponotus have features I don't quite see those features on this ant.
Pics: