LAST EDITED ON Mar-30-06 AT 11:07 PM (PST)
 
Thank you, Bill!

I also have this book ("Cetoniinae Beetles of the World" by Sakai & Nagai), and trying to identify these beetles (Trigonophorus and Rhomborrhina-like species) - nightmare, I agree

About Trigonophorus sp.

Specimen on pic. 2 has an rectangular "horn" and 2 spikes on protibia, and specimen on pic. 3 - triangle "horn" and without spikes on protibia. May it be a sexual dimorphism?

I know, that there is monography of Miksic (Miksic, R. Monographie der Cetoniinae der palaarktischen und orientalischen Region, 2: 1-400, 15 pls., Sarajevo, 1977.) where is a key for all known species of this genera, but I can`t get it