Subject: unknown
Location: Thailand, Bangkok
December 9, 2013 9:44 am
Can you help to work out what this is? It was approx 10cm long…. found in December. Is it harmful?
Signature: Gosia

Longhorned Borer Beetle

Longhorned Borer Beetle

Hi Gosia,
This is a Longhorned Borer Beetle in the family Cerambycidae, but we do not recognize the species.  Some species in the family represent significant agricultural pests.  The larvae are wood borers and most are very specific about which trees and shrubs they feed upon.  The beetles have strong mandibles and some might give a very painful nip if carelessly handled, but they are not venomous, and other than a bit of discomfort or possibly a bit of bleeding, they are not considered harmful to humans.

Erwin supplies an identification
Subject: Gosia’s cerambycid beetle from Thailand
December 10, 2013 9:34 am
This is definitely a male of Xystrocera festiva Thompson, 1861 (the female having antennae not longer and mostly a little shorter than the body). This species is distributed from India to Indonesia (Java, Sumatra). It is indeed an acricultural pest, the larvae bore tunnels into several different plants like cacao tree or coffee plant.  Here you may read something about the life circle of this species:
In Thailand anf Malaysia I saw this beetle rather often.
The only feature that does not fit is the length given by Gosia (“10 cm”), the normal body length is not more than 45 mm. Or maybe Gosia has measured the length including the antennae (if stretched forward).
Signature: Erwin Beyer

Thank you for providing an identification Erwin.  Your recent contributions and corrections to our site are greatly appreciated.  We at What’s That Bug? are thankful for the network of helpful and knowledgeable folks that comprise our readership.

Brilliant! J thanks a lot!
May be I slightly overestimated size but it looked HUGE J

Location: Bangkok, Thailand

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