Dear Wang:

Your insect is a parasitic microhymenoptera in the family Encyrtidae, probably in the genus Aenasius. They are parasitoids of mealybugs.

Best wishes,

Luis Miguel Constantino

Hymenoptera

Thanks, Dr. Luis Miguel Constantino.  and thanks Dmitry Telnov .  

The insect  was collected near some mealybugs. It can be sure that the insect was the parasitic wasp of mealybugs.

Thangks again.

Encrytidae. hymenoptera

Yes this is Aenasius sp. may be arizonensis! (Encyrtidae)