Barkfly (Reuterella helvimacula) feeding on algae(?) - 1

Barkfly (Reuterella helvimacula) feeding on algae(?) - 2

Barkfly (Reuterella helvimacula) feeding on algae(?) - 3

Barkfly (Reuterella helvimacula) feeding on algae(?) - 4