This is a blurry photo of a tandem pair perched on a cattail. But I also collected exuviae on this date, more clearly showing that this species is here.
This is most likely Girardia (Dugesia) tigrina although i do not have the resources to prepare thin sections needed to use the key in Kenk's publication (link below). I did a M.Sc. thesis on this species so I am pretty sure of my ID here in Lake Geneva. (http://nepis.epa.gov/Exe/ZyNET.exe/20017PVN.txt?ZyActionD=ZyDocument&Client=EPA&Index=2011%20Thru%202015%7C1995%20Thru%201999%7C1981%20Thru%201985%7C2006%20Thru%202010%7C1991%20Thru%201994%7C1976%20Thru%201980%7C2000%20Thru%202005%7C1986%20Thru%201990%7CPrior%20to%201976%7CHardcopy%20Publications&Docs=&Query=tricladida&Time=&EndTime=&SearchMethod=2&TocRestrict=n&Toc=&TocEntry=&QField=&QFieldYear=&QFieldMonth=&QFieldDay=&UseQField=&IntQFieldOp=0&ExtQFieldOp=0&XmlQuery=&File=D%3A%5CZYFILES%5CINDEX%20DATA%5C70THRU75%5CTXT%5C00000005%5C20017PVN.txt&User=ANONYMOUS&Password=anonymous&SortMethod=h%7C-&MaximumDocuments=15&FuzzyDegree=0&ImageQuality=r85g16/r85g16/x150y150g16/i500&Display=hpfr&DefSeekPage=x&SearchBack=ZyActionL&Back=ZyActionS&BackDesc=Results%20page&MaximumPages=1&ZyEntry=1&SeekPage=x)
Polycelis coronata, Tiny stream by Fire and Ice Trail. It is not clear from these photos taken in the field that this is P. coronata, however I have been collecting this species from several other locations in the vicinity. I was not able to bring live specimens home to photograph in better detail. No other triclad flatworm lives at these high elevations in this area.