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The mid-infrared spectroscopic analysis of a flux-limited sample of galaxieswith fv(24um) > 10 mJy is presented. Sources observed are taken from theSpitzer First Look Survey (FLS) catalog and from the NOAO Deep Wide-FieldSurvey region in Bootes (NDWFS). The spectroscopic sample includes 60 of the100 sources in these combined catalogs having fv(24um) > 10 mJy. New spectrafrom the Spitzer Infrared Spectrograph are presented for 25 FLS sources and for11 Bootes AGN; these are combined with 24 Bootes starburst galaxies previouslypublished to determine the distribution of mid-infrared spectralcharacteristics for the total 10 mJy sample. Sources have 0.01 < z < 2.4 and41.8 < log vLv(15um) < 46.2 (ergs/s). Average spectra are determined as afunction of luminosity; lower luminosity sources (log vLv(15um) < 44.0) aredominated by PAH features and higher luminosity sources (log vLv(15um) > 44.0)are dominated by silicate absorption or emission. We find that a rest frameequivalent width of 0.4um for the 6.2um PAH emission feature provides a welldefined division between lower luminosity, "pure" starbursts and higherluminosity AGN or composite sources. Using the average spectra, fluxes fv(24um)which would be observed with the Spitzer MIPS are predicted as a function ofredshift for sources with luminosities that correspond to the average spectra.AGN identical to those in this 10 mJy sample could be seen to z = 3 withfv(24um) > 1 mJy, but starbursts fall to fv(24um) < 1 mJy by z ~ 0.5. Thisindicates that substantial luminosity evolution of starbursts is required toexplain the numerous starbursts found in other IRS results having fv(24um) > 1mJy and z ~ 2.

Average Infrared Galaxy Spectra From Spitzer Flux Limited Samples