These kingfishers were fairly common in a variety of wooded habitats. We often saw them perching on power lines as seen here. Note blue wings and tail which help separate this species from similar but smaller Sacred Kingfisher. I believe this is a male based on the strong buffy chest color. This species has recently been split from the widespread Collared Kingfisher (T. chloris) also known as Mangrove Kingfisher or White-collared Kingfisher formerly consisting of 50+ subspecies but now divided into six species: Collared Kingfisher, Pacific Kingfisher, Torresian Kingfisher, Mariana Kingfisher, Melanesian Kingfisher and Colonist Kingfisher. The new split is based on a genetic study by Andersen et al (2015) who found that the Melanesian Kingfisher is actually more closely related to the Beach Kingfisher (T. saurophagus) than to Collared Kingfisher. This split has been accepted by Clements et al. (2019) and Gill & Donsker (2019), but not by Woodall (2019) or Christides et al (2018). There are seven subspecies of which New Georgia birds are representative of the buffy race T. t. alberti. Older references place these birds in the genus Halcyon. Canon PowerShot SX60.
References:
Andersen, M.J.; Shult, H.T.; Cibois, A.; Thibault, J.C.; Filardi, C.E.; Moyle, R.G. (2015). Rapid diversification and secondary sympatry in Australo-Pacific kingfishers (Aves: Alcedinidae: Todiramphus). Royal Society Open Science. 2 (140375).
Christidis et al. 2018. The Howard and Moore Complete Checklist of the Birds of the World, version 4.1 (Downloadable checklist). Accessed from https://www.howardandmoore.org.
Clements, J. F., T. S. Schulenberg, M. J. Iliff, S. M. Billerman, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2019. The eBird/Clements Checklist of Birds of the World: v2019. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
Dutson, G. (2011) Birds of Melanesia, Christopher Helm, London.
Fry, C.F., Fry, K. and Harris, A. (1991). Kingfishers, Bee-eaters, and Rollers. Princeton University Press
Gill, F & D Donsker (Eds). 2019. IOC World Bird List (v9.2). doi : 10.14344/IOC.ML.9.2. Available at http://www.worldbirdnames.org/
Gregory, P. (2017) Birds of New Guinea, Including Bismarck Archipelago and Boughainville. Lynx Edicions, Barcelona.
Woodall, P.F. (2019). Collared Kingfisher (Todiramphus chloris). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/55767 on 25 October 2019).