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Janet - subalpina has a dark anterior spiracle, and a less-infuscated lower calyptra - the pale spiracle and infuscated calyptra on your specimen would exclude this species. As for the convexity of the occiput, I can't really see any difference between your specimen and those vicina in the gallery (allowing for different angles of view). The size of the specimen is well within the range of vicina - all carrion-feeding species are able to produce small individuals if conditions require it. If you want to make this into anything other than vicina, you will have to collect the specimen!