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Large infrared and millimeter wavelength surveys of the Galactic plane haveunveiled more than 600 new bubble HII regions and more than 3000 candidate starclusters. We present a study of the candidate clusters MCM2005b72, DBS2003-157,DBS2003-172, and MCM2005b77, based on near-infrared spectroscopy taken withSofI on the NTT and infrared photometry from the 2MASS, VVV, and GLIMPSEsurveys. We find that (1) MCM2005b72 and DBS2003-157 are subregions of the samestar-forming region, HII GRS G331.34-00.36 (bubble S62). MCM2005b72 coincideswith the central part of this HII region, while DBS2003-157 is a brightmid-infrared knot of the S62 shell. We detected two O-type stars at extinction\Aks=1.0-1.3 mag. Their spectrophotometric properties are consistent with thenear-kinematic distance to GRS G331.34-00.36 of 3.9pm0.3 kpc. (2) DBS2003-172coincides with a bright mid-infrared knot in the S36 shell (GRS G337.92-00.48),where we detected a pair of candidate He I stars embedded in a small cometarynebula. (3) The stellar cluster MCM2005b77 is rich in B-type stars, has anaverage Aks of 0.91 mag, and is adjacent to the HII region IRAS 16137-5025. Theaverage spectrophotometric distance of $\sim 5.0$ kpc matches thenear-kinematic distance to IRAS 16137-5025 of 5.2pm0.1 kpc.

Detections of massive stars in the cluster MCM2005b77, in the star-forming regions GRS G331.34$-$00.36 (S62) and GRS G337.92$-$00.48 (S36)