The cover claims 1476 illustrated species, covering 316 families.
The photos are credited to various sources, you’ll probably recognise more names than I.
I rather like the headers that give some idea of the complexity. F’rinstance, the Tachinids are introduced as “145 gen[era] | 267 spp | 4 ill[ustrated]”
Possibly contentious is the tendency to try to use as many common names as possible, something the author is clearly in favour of. But I’ve never heard of Ichneumons being called “Darwin Wasps”.
I rather like the fact that sonograms for the Orthoptera are included - next best thing to an accompanying CD.