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If you look for a good review of invasive Pheidole species you can have a look at this:
“Introduced Pheidole of the world: taxonomy, biology and distribution” by Eli М. Sarnat, Georg Fischer, Benoit Guénard, Evan P. Economo
http://zookeys.pensoft.net/articles.php?id=6050
(I only found, until now, only a few small mistakes – typographic???).

And if you want to see more about the changing trends in entomological/myrmecological publications:
http://ae.oxfordjournals.org/content/61/4/252