How do I get other races to immigrate to my colony?
I have an LIS region map.
I have a Stargate in one of my regions and have independence.
Is there a way I can entice insectoids and reptilians to immigrate?
It is possible for them to migrate, but there is nothing you can really do to entice it. It's based on what civilizations other players are using who are currently online while you are playing, as colonists through the stargate come directly from other players' colonies.
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Embassies with alien colonies also allow for alien immigration.
Dino, Emperor of Terra Nova