|scientific name Neothremma |
Can be found in small to large, smooth flowing mountain streams.
Adults are flying from late mid-June to mid-August.
The heads of the adults are not very wide and tend to be strongly domed at the vertex. The eyes are small and the lateral ocelli are distinctly anterad, behind the large anterior warts. The first antennal article is 1.5 times the head length and the ventral suface is covered with long, thick and silky setae. The tibial spur count is 1, 3, 4. Dark grey, irrorate. Two of the seven species known (Wiggins, 1996) occur here in Alberta: Neothremma alicia and N. laloukesi.
Larvae tend to pupate in clusters on the lower surface of rocks, with N. alicia having a two year lifecycle (Wiggins, 1996).
Larvae feed on fine organic particles, diatoms and algae.
Restricted to western North America, where they are widespread thoughout the mountains, north to Yukon, British Columbia, and Alberta; south to Colorado and California (Wiggins, 1996).
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