Evans is a treasure, and "little-known planet" is right. Too, as phylogenetics continues to overturn the classic understanding of taxonomic relationships, the f

Evans is a treasure, and "little-known planet" is right. Too, as phylogenetics continues to overturn the classic understanding of taxonomic relationships, the family often seems to grow about as much more complex as less, of late. It is actually getting clearer, but there are also whole taxa whose existence can be inferred from genomic evidence but not demonstrated because no example has yet been found. By all impressions, it's a wildly exciting field of study in recent decades, if not one seeing the concomitant level of investment. If you find the subject compels, the next place I'd point you would be Seirian Sumner's quite recent and frankly outstanding Endless Forms, which offers both a worthy successor to Evans' perspective on the hymenopterans, and a view of the astonishing breadth of the field's development since Evans' own day - and no shortage of remarkable anecdotes, either. (Hymenopterology has a habit of furnishing these, I find! Search "Polydnaviriformdae" some time...)