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Photo#560718
Tibicen davisi nr. harnedi - Neotibicen davisi - female

Tibicen davisi nr. harnedi - Neotibicen davisi - Female
Tuscumbia, Colbert County, Alabama, USA
July 31, 2010
Coll. M. Reynolds (w/ B. Reynolds & G. Reynolds)
Collected at lights

While most males are characterized by deep bright greens and smoky coloration to the apical wing cells, the few females reviewed from this locality seem to possess reduced infuscations in the wings, muted greens, straw-yellows, golden-browns with richer reds on the mesonotum (per. observ.).

Unlike many individuals belonging to the nominate "ssp. davisi", neither gender in the taxon "harnedi" seems to have black pigment ventrally (dark edging to the abdominal sternites).

For details, refer to page 146 in the following:
Photo on Plate VII, image #4:

Images of this individual: tag all
Tibicen davisi nr. harnedi - Neotibicen davisi - female Tibicen davisi nr. harnedi - Neotibicen davisi - female

Resembles T. auriferus...
The size and shape of davisi strongly resembles auriferus, as does the mesonotal patterning, however, the overall coloration Is a lot more "reddish" or "rusty", while auriferus is greener and browner. The difference between these two cicadas, is equivalent to the difference between auletes and resonans, one might say, because they are two similar, nearly identical cicadas with differences in color. (auletes= green/brown/taupe; resonans= red/rust)

 
harnedi types are very similar to auriferus
Yes, davisi and auriferus are close!
However, these "harnedi & -like" cicadas from sw TN, n. MS and nw. AL are more like auriferus in wing shape and other traits than are pop's of the nominate race, davisi. The taxonomic placement for these remains in debate and will likely require genetic analysis to tease apart the details...as you observed, auriferus and davisi are very similar and for the record very closely related.

It's also important to mention that the color schemes you mentioned as differentiating the 2 are not absolutes for either (compare pic's). Both auriferus and davisi vary in size, color and pattern across their ranges. Both species may be orangish-brown, rust, bright green, dark green, yellow green, olive, taupe, tan, even black!...or combo's of these colors...etc.

Side note, although resonans and auletes are similar, they are quite different in wing shape (like davisi nominate from auriferus & harnedi). The wings of resonans are narrow by comparison and the thoracic patterns are slightly different between these two big cicadas. As I recall from previous discussions with a few cicada folks, resonans is actually closer to resh in several ways than it is to auletes.

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