I have another offering for the placename:
Drumstanarchan. I found it in a book I have, and have not positively identified it on a map. It was on the Estate of Edradynate, which can be found on a map. The estate was in a detached part of Logierait Parish (shown as detached part No.2 on the 1850s OS map). That detached part was transferred to Weem Parish in 1891, following the work of the Boundary Commission set up by the Local Government (Scotland) Act 1889. The commission's main tasks were to do away with detached parts of parishes, detached parts of counties and parishes which lay across county boundaries.
The 1850s OS map can be seen at:
http://www.nls.uk/maps/os/oneinch_1st_list.htmlSelect sheet 55 - Blair Atholl
About midway between the centre of the map and the south-east corner, you will see a long bend in the river (River Tay). Click on the northmost point of the bend in the river until you can read the placenames. Then find the railway line parallel to the river. Pan left a couple of times until ABERFELDY BRANCH is right of centre in your view of the map. You should now see Edradynate onthe north bank of the river immediately west of there. Drumstanarchan must be close to there. The other places listed on the estate, which were all in the transferred parcel of land were Balnald, Blackhill, Knockreach, Lick and Lurgan. So it is fair to assume that Drumstanarchan was close to them all. It is described as a house rather than a farm. All these properties were owned by James Stewart Robertson of Edradynate at the time of the boundary commission's work.
The 1832 John Thomson atlas, the Perthshire map
http://www.nls.uk/maps/atlas/thomson/531.html shows the same area on its north-east section. About a third of the way up the west edge of that map, you will find that same detached section of Logierait Parish with Edradynate Estate. Within that you will find Drumshandy which may be Drumstanarchan - I've no proof, but I have no better offering. Drumshandy shows on some of the other early maps (pre-Ordnance Survey).
ADP