Asian lady beetles will not eat plant material, only aphids and the like. Same goes for thier aligator looking larvae. They behave as thier North American cousin except for one thing.. they bite people. They arent worth the hassle, so if you want to use lady beetles for pest control (is there a problem now or one anticipated later on?) your best bet is to order them through your local garden supply store. If you aren't sure which kind is hanging out around your place (probably both) they are easy to spot when you know what to look for; North American type lady beetles are always a rosy tomatoe color with a nice shiny carapice with 2 black spots. Asian Beetles are often paler verging to yellow or orangey-red and have a slightly pointed rear on the carapice. They will also usually have anywhere from 4 to sometimes 6 black spots. Oh yeah, and a more prominant head/neck that juts out farther from their "shoulders". N.American beetles are blunt headed.
You can also order praying mantis eggs through some shops, they are really neat when they hatch and spread out over the plants looking just like mom and pop do only in miniature. Hope this helps.