#1
This tiny fly (my Louper app says 1.15mm) looks like
Chironomidae to me except for the short forelegs.
A similar, slightly larger (1.9mm) fly has the longer forelegs.
Austin, Travis County, Texas, USA. Attracted to UV light.
#5
For the first individual, the short legs and wing shape (I hope I am interpreting it correctly) remind me of
Corynoneura. The larger individual seems fairly distinctive, but I am unable to place it.