Mark Melton
Life of the Party
Petrophila larvae and pupae are found in glides with a cobble substrate. They are a member of the moth family and spend their adult life in the air and on land. As larvae and pupae they build a small shelter on the top or side of cobble. This is made of silk and topped with algae. They are found between June and August.
Case 13mm Larva 11mm
Larva dorsal view
Larva dorsal view
Larva ventral view
Top view of mat covering pupa
Underside of mat with pupa in it
Mature pupa
Here is an article on fishing the hatch: https://cpw.state.co.us/Documents/LandWater/Riverwatch/EntomologyContents/AquaticMoths.pdf
Case 13mm Larva 11mm
Larva dorsal view
Larva dorsal view
Larva ventral view
Top view of mat covering pupa
Underside of mat with pupa in it
Mature pupa
Here is an article on fishing the hatch: https://cpw.state.co.us/Documents/LandWater/Riverwatch/EntomologyContents/AquaticMoths.pdf