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Photo#9198
3-spotted caddisfly - Ptilostomis

3-spotted caddisfly - Ptilostomis
Ailsa Craig, Ontario, Canada
June 30, 2004
Large: head to wingtip 20-22 mm. The pale wing spots arranged in a triangle, and the dark dorsal markings are similar to both of Patrick's photos in the Guide, and a good match to Cedar Creek's Ptilostomis image (whose 3 spots are present but not as conspicuous). Members of the family Phryganeidae are called Large Caddisflies.

Ptilostomis seems plausible
The second supplement to Insects of North Carolina lists Ptilostomis ocellifera from this area with dates in May and September, precisely when I saw them. This makes this identification rather plausible. Also note the length measurements I made on a specimen found dead were just the same as yours--head to wingtip 22 mm. It is apparently a widespread species: Ontario, Minnesota, North Carolina.

I'd say this is looking like a good identification, at least as plausible as one can get without consulting specialists and having specimens in hand. (I still have that one I found dead.)

Patrick Coin
Durham, North Carolina

 
Ptilostomis candidates
I see that the Ontario list has only two species: ocellifera and semifasciata. The names roughly translate into "wild-eyed" (or maybe just eyed/eye-spotted), and "partly-banded" - but I suppose both descriptions could possibly apply to this one, so until something better turns up (such as an IDed photo or specimen of P. semifasciata), Ptilostomis sp. seems like a safe bet.

 
Ontario list of caddisflies
Where is the Ontario list of caddisflies, Robin? Being close to the Ottawa River, I get a lot of them, but have a hard time ID'ing them.

Nolie

 
The NHIC site in Peterborough
here is what I've bookmarked in my browser when searching for Ontario lists of anything (animals or plants).

Type any word into the Search box (it doesn't have to be a species) and see what happens. There are large omissions (e.g. all flies except Robbers; true bugs; various others) but it's good for Lepidoptera, beetles, and some other groups. A patchwork hit-or-miss database at the moment, but hopefully they're working on completing it.

Unfortunately, there's no descriptive text included, so it doesn't help with ID - other than to indicate a thing's absence/presence in Ontario.

 
The NHIC site in Peterborough
Thank you very much, Robin.

Nolie

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