I had found a PDF with tables of Melanopline genitalia [url=http://www.dnr.state.wi.us/org/es/science/publications/GGW_glossary.pdf[/url] a while back. The table for females is not terribly useful but I have to admit that Melanoplus femurrubrum seems the best fit to my eye. I'm ading another shot with a rotated crop of the genitalia for comparison.

Should I move the images to species page?

It is great to have the added shot, but as you discovered, the female external parts are pretty useless (in this genus anyway), unless you have details (usually not given in literature, or pretty marginally distinctive), and a hand lense to look really closely at the insect in your hand, it's pretty hopeless. Sometimes you can tell by dissection of the female genitalia, but that doesn't work well with live photographic subjects. I think most literature ignores the females except coloration and assocation with males. So, females of this genus are best identified by association with males or personal familiarity with the species. The coloration/pattern of this species is pretty distinctive, so usually you can figure the females out. Occasionally, a few species produce individuals that cannot be told reliably from occasional individuals of this species; in this case the most common of these would be M. sanguinipes. So, there is always a degree of uncertainty with females. With your photo, I think it's a pretty sure thing though.