One cannot begin to identify the species of ants in your new colony without more information. Ideally, it would be good to post all of the following.
FIRST-Where collected? Country and nearest city or town on map, elevation if in a very mountainous area such as the Rockies, Alps, Himalayas, Andes.
SECOND-Habitat of collection, including nesting medium (wood, soil, leaves tied together with silk, etc.) and type of vegetation (forest, grassland, park/lawn/garden, desert).
THIRD-Coloration, hue and pattern? Uniform?, Head darker?, Gaster darker?, Legs lighter or darker?, Any spots? Also, shininess, dullness.
FOURTH-Distinguishing characteristics, such as one or two segments in waist; location, length and orientation of any spines or bumps on the mid portion of the body or waist; head shape, etc.
FIFTH-Length in millimeters. (Width is also helpful.) NO guessing! Stretch out a dead or chilled individual or several individuals of different sizes along a millimeter rule. 16ths of an inch will do as a poor second to millimeters.
SIXTH-Anything else distinctive, such as odor, behavior, etc.
Tip #1: If you can take clear photographs of the ants close up, then please post them. This would help a lot.
Tip #2: For those who write anting journals, please put the exact location and dates in the thread titles like: Palm Spring, CA (4/10/2004).
Now, you can post your identification request in a new thread (not this one).
[revised the post] --antdude

