Hawaiian Insects and their Kin - by Francis G. Howarth, William P. Mull
Good general guide to common Hawaiian insects and spiders.
Hawaiian Damselflies - by Dan Bolhemus and Adam Asquith
A field identification guide with descriptions and color plates of the 26 species and subspecies of Hawaiian damselflies.
Insects of Hawaii: Introduction - by James K. Liebherr, preface by Elwood C. Zimmerman
A comprehensive, informative and well illustrated series. Amazon has volumes 14-17. You can ask them to search for other volumes.
Volume 3: Heteroptera
Volume 4: Homoptera: Auchenorhyncha
Volume 9: Microlepidoptera - Parts 1 and 2
Volume 10 Diptera: Nematocera - Brachycera (except Dolichopodidae)
Volume 11 Diptera: Brachycera II - Cyclorrhapha I
Volume 11 (Supplement): Diptera, Dolichopodidae and Appendix (Phoridae)
Volume 12: Diptera Cyclorrhapha II
Volume 13 Diptera: Cyclorrhapha III Volume 14: Diptera Cyclorrhapha IV - by E.D. Hardy Volume 15: Collembola - by K. Christiansen & P. Bellinger Volume 16: Coleoptera: Carabidae Part 1: Introduction and Tribe Platynini - byJames K. Liebherr & Elwood C. Zimmerman Volume 17 Hawaiian Hylaeus (Nesoprosopis) Bees (Hymenoptera, Apoidea) - by Howell V. Daly & Karl N. Magnacca
Quality drawings, excellent descriptions and easy to use keys make this a valuable book on Hawaiian bees.