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Entomology (Study of Bugs)/Mysterious winged insect

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Question
What is this?
What is this?  
Hello, Walter.

I was walking down the streets of New Westminster a few days ago when I saw this creature flying along the sidewalk. I'd never seen anything like this before! It was on the large side, maybe as long as my finger, and had four big wings, and orange markings lining its thorax. It flew across the street, and when I found it again, it landed on the street corner pavement and crawled around on it, often fluttering along a short distance off before landing again. I'd really love to know what this is, it's like nothing I've ever seen!

Answer
Hi Jascha
. This is the female Dobson fly (Corydalus cornutus) It spends most of its life at the bottom of streams and is called a Hellgrammite. When I was a kid we used them for bait.
It pupates and leaves the water  to mate. The male has huge jaws . Google Dobson fly and see some examples

Entomology (Study of Bugs)

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Walter Hintz

Expertise

I can answer any questions about insects and spiders.

Experience

I have taught science for over 57 years. I am presently teaching biology at the college level. I have done extensive graduate work in entomology.

Publications
Momentum Magazine The Ohio Journal of Science

Education/Credentials
B.S. In Ed Kent State Unuv M.Sc The Ohio State Univ National Science Foundation Fellowships: Electron Microscopy Univ of California Entomology Kent State Univ

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