Dromahair is a town in Leitrim and Killarga is a Parish in Leitrim. They are very close; maybe Dromahair is in the parish of Killarga. I noticed your message because I am including McGowans in my family history although I am not really descended from them: my grandmother's second marriage was to Owen McGowan of Drumkeerin (just south of where you are talking about). He was married to a Brigid Flannigan so the coincidence is interesting but very common.Are you familiar with the web sites that focus on Leitrim ? That is where you can get help: one is the Leitrim-Roscommon Site and the other is just Leitrim (actually you might get to it via a link with this page). Your browser should be able to spit them out to you.