California Department of Fish and Wildlife
Aquatic Biological Assement

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Syrphidae Level 1 Level 2

Syrphidae

 

Key Characters

Prothoracic spiracles absent or with stigmatal openings near apex of simple stalk.Ribbed filter chamber in area normally occupied by mouth hooks.

Tolerance 10
Distribution CA, OR, WA, NV, AZ, Baja