Quoting "T. Michael Keesey" <keesey@gmail.com>:
"Raptorex" seems a very odd way to combine the root words, kind of like "crooking" ("crook" + "king").
Very true, especially given that Latin is not generally given to haplology the way Greek is (the famous example being "amphi-phora" 'carried on both sides, two-handled' becoming "amphora").
Interestingly, though, the authors have actually stumbled on a better name than the one they were going for. A "raptorex" would be a "rex" that is "raptus", that is, a 'seized' or 'plundered king'--quite appropriate for a fossil that was apparently smuggled out of China.
-- **************************************************************** Nicholas J. Pharris