Syrphid Fly and Fruit Fly ID
a great key to syrphid flies: http://cjai.biologicalsurvey.ca/mylmst_23/mylmst_23.pdf
Ferdinandea is a very distinctive genus and easy to identify. There are only 3 species in North America. Here is a key to species: http://biodiversitylibrary.org/page/39701381
Yes! A super key and guide to fruit flies of California. This has keys, species notes/locations, plant hosts and WING PATTERN guide (at the very back.) A moment here to reflect on the enormous amount of easily found research brought to the internet by the UC system.
