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The Rhipiphoridae of California (Coleptera)
By Linsley E.G., MacSwain J.W.
Bull. Calif. Insect Surv. 1: 79-88, 1951
Cite: 360547
Key and species profiles of 19 spp. in 2 genera.
Full text

Ripiphorus rex omitted
Readers should be warned that Ripiphorus rex does not appear in this article. Evans and Hogue (1), perhaps due to more recent records, state that it is found in CA. R. rex is very similar to R. vierecki. I found that the male of the former keys to the latter after a clerical error is fixed (step 2 should lead to 5 or 3, not 4 or 3). To distinguish the two, Evans and Hogue state R. rex "is unique among the species of Ripiphorus in having a serrated outer edge of the middle tibiae". I have posted an image of its right middle leg, profiling these serrations.

 
Revision of the Rhipiphoridae of North and Central America
The subject paper(1), which I've just added to Books, has a more complete key and descriptions which separate R. rex and R. vierecki based on other features, should tibia serrations, or lack thereof, not be resolvable.

 
thank you very much for the important note, Ed!
i'll add notes to the relevant guide pages

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