Hypochrysops piceatus, commonly referred to as the bulloak jewel, is a species of butterfly in the family Lycaenidae endemic to Australia.

[1] Mount Emlyn, the location of the pastoral property of one of the original discoverers, Jack Macqueen, had its population extirpated due to subsequent extensive land clearing that had occurred.

[1] In particular, the Brigalow Belt South Interim Biogeographic Regionalisation for Australia (IBRA) in low rainfall areas of below 600 millimetres (24 in).

[4] In the state of Queensland it is listed as "Critically Endangered" under the provisions of Nature Conservation (Animals) Regulation 2020 as of December 2023.

"[3] Braby et al. named habitat degradation in the forms of increased drought and fire frequency, invasive weeds, land clearing (for grazing purposes or expansion of roadways and tracks), removal of dead and fallen trees which support ant trails (for use as firewood), rubbish dumping, and selective removal of mature A. luehmannii trees (to be processed into fence posts, firewood, turnery).

[1] Conservation of the bulloak jewel is led by the Goondiwindi Bulloak Jewel Butterfly Project, a collaboration between the Goondiwindi Botanic Gardens, MacIntyre Ag Alliance, QMDCL Inglewood Aboriginal Rangers, and Queensland Trust For Nature, works in creating patches of habitat to create navigable spaces between known populations.

Saplings are also inhabited, but are suboptimal habitat for the larvae due to the absence of mature hollow branches that can sustain colonies of the attendant ant.

[1] Male butterflies land on treetops or at the edges of trees (A. luehmannii or Angophora leiocarpa) during sunny periods to establish mating territories.

Adults have been observed feeding on various plants including: Amyema spp., A. leiocarpa, Eucalyptus tereticornis, Jacksonia scoparia, Kunzea opposita, and some varieties of mistletoes.

There is a network of white, oblique ridges which form four deep-sided pits with upwardly pointed spines at the midsection.

[1] Eggs are deposited individually or in small clusters on mid-canopy stems of the host tree, near trails of the attendant ant.

[1] In captivity, the larvae would pupate in concealed locations, including beneath bark and in rolled corrugated cardboard.