Post by Adam Cotton on Jul 13, 2021 0:44:18 GMT -8
They belong to family Sphingidae (hawk moths), and the one at top right looks like a South American species. I am not familiar with American species, but I am sure someone will know approximately what they are.
Do you know where they come from? Maybe there are data labels pinned under the specimens. Data would make it much easier to identify them correctly.
Post by Adam Cotton on Jul 15, 2021 8:19:47 GMT -8
Generally it will not be very helpful, as it only covers species from Western Europe as far east as Central Asia. Only about 10 species on the site occur in Thailand (often different subspecies), and I rather doubt that any more than those will occur in Vietnam.
This site tpittaway.tripod.com/china/china.htm Sphingidae of the Eastern Palaearctic (including Siberia, the Russian Far East, Mongolia, China, Taiwan, the Korean Peninsula and Japan) will be much more helpful.