Range: Southeast Asia, especially
Chalcosoma atlas is extremely similar
in form to C. caucasus, which also occurs on the Malaysian peninsula.
C. atlas is readily distinguishable from the latter by the shape
of the terminal point of the cephalic horn. In C. atlas, the
end of the cephalic horn has a rather broadened, upward curving hook-like
section bearing very distinct, raised ridges. This feature is lacking
C. caucasus. Also, unlike the case
there is no dorsal spine on the cephalic horn of C. atlas.
Another feature of note is that the elytra usually more brilliantly bronze
in color than in C. caucasus, which generally has a darker, bluish