They are alligator lizards.
In fact, I believe northern and southern are closer related to each other evolution wise than they are to other species of alligator lizards.

There are several families of lizards for which both types of reproduction exist. Skinks, spiny lizards, horned lizards, probably others too - have species that are egg laying and species that are live bearing.

In fact I believe there is a species of skink that is known to do both.
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6.8 L. getula californiae - 11 eggs (Cal. King)
1.2 L. getula nigrita (MBK)
1.0 L. getula floridana (Brooksi)
1.0 Pantherophis guttatus guttatus (Corn)
0.1 Pituophis catenifer catenifer (Pacific gopher)
3.3 Elgaria multicarinata multicarinata - 14 eggs (Cal. Alligator Lizard)

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