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I am highly, truly impressed by the second volume! Haven´t studied the keys in too much detail yet, but skimming through the Platycheirus and Cheilosia descriptions made an amazing evening. This is an beautiful book which gives all species a lot of space.

As with all Nationalnyckeln volumes, the editorial board choses to keep the number of references to a minimum, which makes them a bit less useful for some of us. I guess they choose to do this to make them more accessible for the average user. Maybe they think the books seems more "definite" and "true" to the reader without all citations, which of course is a fallacy.

However, the author does a fine job informing the reader about the parts of the work that still rests on a bit unsafe ground, such as the nice discussions about the unresolved diversity within the Pipiza noctiluca complex.