Not a harvester, but a nectarivore and scavenger. These have replete workers (technically lipergates, meaning fat-workers) that store food in fall-spring, convert it to whitish fat, then convert that to glandular secretions which feed the entire colony through the heat of summer, when they do not forage. A good example of a lipergate that has already gained about half of its fat (by February) is this picture:

One of the first ants to swarm in the spring.

Moved from ID Request.