Many of the non-harvester ant varieties are nocturnal so you won't see much of them in the day time. I have found that if you just dig a little in what looks like a likely ant hole you'll eventually find some other types. I live on the western edge of the Mojave and have found a couple types of very large carpenter ants that my HL's love. One type is just found in the ground, often near the roots of bushes. The other I have found beneath rotten logs partially in the ground.
If you go out looking you'll probably find something.
One thing I have noticed over time is that HLs seem to like variety, regardless of what you feed them. (mostly ants, but a variety of ants with a few other tidbits thrown in here and there).
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2 Kings 6:15-17