The pubescent scutellum is another giveaway. Also the elytra are more mottled appearing than in G. despectus, which has the elytra more uniformly gray (outside of the postmedian fascia).

if fasciatus was my first guess? Based on the photos & description in D. Yanega's book.

I know, I know; quit guessing and learn!

it's a wonderful book that i especially admire for its very mindful concept and selection of essential info. as Doug once told me, "I designed that book in precisely the way I believed a field guide should be. I had the luxury of no editorial oversight or concern with marketability, so it's purely practical."
i can't agree more: exactly my idea of a perfect pocket guide that strikes the balance between state-of-the-art science and user friendliness (too bad no hi-res digital photography was available back then). i wish we had guides designed along these lines for every major arthropod taxon [dream on, =v=]. on the other hand, its complete opposite, Ratcliffe & Paulsen's Scarabaeoid beetles of Nebraska(1), is no less an admirable undertaking: the in-depth treatment of a local fauna makes it a work of a global import --the wealth of information and the range of general issues discussed are such that anyone interested in scarabs, no matter where in the world, would want to keep that book handy (although it's a desktop item, rather than a field guide)

the next time you contact Mr. Yanega, tell him that we greatly appreciate his book and the efforts and knowledge that went into it. (There's so many folks I wish to thank that I best get started.)