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We present an NTT/SOFI spectroscopic survey of infrared selected Wolf-Rayetcandidates in the Scutum-Crux spiral arm (298 < l < 340, |b| < 0.5). Weobtained near-IR spectra of 127 candidates, revealing 17 Wolf-Rayet stars - a~13% success rate - of which 16 are newly identified here. The majority of thenew Wolf-Rayet stars are classified as narrow-lined WN5-7 stars, with 2broad-lined WN4-6 stars and 3 WC6-8 stars. The new stars, with distancesestimated from previous absolute magnitude calibrations, have no obviousassociation with the Scutum-Crux arm. Refined near-infrared (YHJK)classification criteria based on over a hundred Galactic and Magellanic CloudWR stars, providing diagnostics for hydrogen in WN stars, plus theidentification of WO stars and intermediate WN/C stars. Finally, we find thatonly a quarter of WR stars in the survey region are associated with starclusters and/or HII regions, with similar statistics found for Luminous BlueVariables in the Milky Way. The relative isolation of evolved massive stars isdiscussed, together with the significance of the co-location of LBVs and WRstars in young star clusters.

A deep near-infrared spectroscopic survey of the Scutum-Crux arm for Wolf-Rayet stars