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We report the results of a search for class II methanol masers at 37.7, 38.3and 38.5 GHz towards a sample of 70 high-mass star formation regions. Weprimarily searched towards regions known to show emission either from the 107GHz class II methanol maser transition, or from the 6.035 GHz excited OHtransition. We detected maser emission from 13 sources in the 37.7 GHztransition, eight of these being new detections. We detected maser emissionfrom three sources in the 38 GHz transitions, one of which is a new detection.We find that 37.7 GHz methanol masers are only associated with the mostluminous 6.7 and 12.2 GHz methanol maser sources, which in turn arehypothesised to be the oldest class II methanol sources. We suggest that the37.7 GHz methanol masers are associated with a brief evolutionary phase (of1000-4000 years) prior to the cessation of class II methanol maser activity inthe associated high-mass star formation region.

37 GHz methanol masers : Horsemen of the Apocalypse for the class II methanol maser phase?