I believe this is a variant male showing a white chin. Females are duller below. Except for the bluish color of its crown and forehead, this species is identical to the White-chinned Jacamar (Galbula tombacea) which replaces it on the north side of the Amazon. There is no reported overlap in range between the two. Like other jacamars, this species forages by sallying out for flying insects and catching them in mid-air like a flycatcher. Its long pointed bill is presumably used to excavate its nest. However only one nest, a tunnel in a stream embankment, has ever been described for this poorly known species. Canon PowerShot SX60 HS.
References:
Bluish-fronted Jacamar (Galbula cyanescens), In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. retrieved from Neotropical Birds Online: https://neotropical.birds.cornell.edu/Species-Account/nb/species/blfjac1
Brightsmith, Donald J. (2004) Nest sites of termitarium nesting birds in SE Peru. Ornitología Neotropical 15: 319-330.
Tobias, J., Züchner, T., de Melo Júnior, T.A. & Bonan, A. (2019). Bluish-fronted Jacamar (Galbula cyanescens). 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/55948 on 15 July 2019).