Species are distributed in tropical Asia and are rare in Melanesia.
The gallery system in this genus appears to be rather variable (Browne 1961b). In C. bella(Sampson) and C. punctipenna (Schedl), an unbranched entrance tunnel leads to a single terminal brood chamber in the longitudinal plane. In C. confusa(Hopkins), the tunnels are simply branched and expanded in places to form small, irregular brood chambers in the longitudinal plane. In C. quadricostata(Schedl) and C. curvidente (Schedl), which usually breed in small diameter stems, there is a bifurcate or circumferential gallery in the transverse plane, and one or two longitudinal branches of very variable width in which the larvae develop (Browne 1961b).
Coptodryas is paraphyletic with several species of Microperus. Further study is necessary to delimit both genera.