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We present a catalogue of starless and protostellar clumps associated withinfrared dark clouds (IRDCs) in a 40 degrees wide region of the inner GalacticPlane (b<1). We have extracted the far-infrared (FIR) counterparts of 3493IRDCs with known distance in the Galactic longitude range 15<l<55 and searchedfor the young clumps using Hi-GAL, the survey of the Galactic Plane carried outwith the Herschel satellite. Each clump is identified as a compact sourcedetected at 160, 250 and 350 mum. The clumps have been classified asprotostellar or starless, based on their emission (or lack of emission) at 70mum. We identify 1723 clumps, 1056 (61%) of which are protostellar and 667(39%) starless. These clumps are found within 764 different IRDCs, 375 (49%) ofwhich are only associated with protostellar clumps, 178 (23%) only withstarless clumps, and 211 (28%) with both categories of clumps. The clumps havea median mass of 250 M_sun and range up to >10^4$ M_sun in mass and up to 10^5L_sun in luminosity. The mass-radius distribution shows that almost 30% of thestarless clumps identified in this survey could form high-mass stars, howeverthese massive clumps are confined in only ~4% of the IRDCs. Assuming a minimummass surface density threshold for the formation of high-mass stars, thecomparison of the numbers of massive starless clumps and those alreadycontaining embedded sources suggests an upper limit lifetime for the starlessphase of 10^5 years for clumps with a mass M>500 M_sun.

The initial conditions of stellar protocluster formation. II. A  catalogue of starless and protostellar clumps embedded in IRDCs in the  Galactic longitude range 15<l<55