changing honorific epithets

[Doug Yanega]

I have another nomenclatural query: when an author names a species with an
honorific, must the ending follow a certain rule or face emendation? I ask,
for example, in the case of the beetle _Oberea schaumii_ LeConte 1852.
Casey came along in 1913 and spelled it _schaumi_, which is how it is
presently listed. Similarly for _Liopus wiltii_ Horn 1880, which has just
been renamed by Linsley & Chemsak as _Liopinus wilti_ (and they do not even
specify the change to be an emendation, they just drop the second "i" and
leave you guessing as to why). I thought emendation was only allowed when
the original spelling was shown to be *in error*? In the above cases, are
the changes of spelling valid and binding?
Thanks,

Doug Yanega       Illinois Natural History Survey, 607 E. Peabody Dr.
Champaign, IL 61820 USA      phone (217) 244-6817, fax (217) 333-4949
 affiliate, Univ. of Illinois Urbana-Champaign, Dept. of Entomology
  "There are some enterprises in which a careful disorderliness
        is the true method" - Herman Melville, Moby Dick, Chap. 82