Beetles feeding on cycads in Luzon, Philippines

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Images were posted to PestNet and Rolf Oberprieler, CSIRO Ecosystem Sciences responded:

"It’s a species of Erotylidae in or near the genus Anadastus. This genus is well known to feed on young cycad foliage in various parts of the world. You should contact Rich Leschen in New Zealand for possible further identification and references."

Two species of Anadustus have type specimens from Luzon:
Anadastus bicolor Chujo, 1974
Anadastus luzonicus Chujo, 1974

It is interesting to note that erotylids have been associated with pollination of cycads. See

An image of a similar-looking erotylid can be seen here.