Posted by LRubio7 on 18-03-2017 18:24
#1
Hello! This one was found on a stone beside a river, in Córdoba, Argentina. I have more photos..
Edited by LRubio7 on 20-03-2017 22:22
 
Posted by Eric Fisher on 19-03-2017 22:12
#2
This is 
Efferia (s.l.) sp./ (probably 
Nerax sp.). -- different sp. from previous fly laying eggs. (This subgroup of 
Efferia has many Neotropical spp.).
Cheers,    Eric