Browsing through the pages for Darke County, Ohio, I found the birth volume index and located him there:
His name was mispelled as Leamaster in the index, and the record, much as his sister's birth had as well.
Paging through the records, I did manage to find his birth record, and it was recorded as September 1, 1870, not 1871. Time to correct my records.
A direct link to the record is here.
Source : "Ohio, Births and Christenings, 1821-2003." Index and Images. FamilySearch. (https://familysearch.org) accessed 24 April 2013, Darke County, Ohio Birth Registers with index 1863-1878 vol. 1.