Euchromia horsfieldi is a species of Arctiidae. Christmas Island, Australia, April 2011.

In 1897-98, Charles Andrews found Euchromia horsfieldi on Christmas Island.

Horsfield & Moore (1858-1859) described this moth:

Phalanna horsfieldi n. sp. Dark brown : fore-wing with a lengthened spot below the cell, indented in the middle of its posterior margin, a shorter spot within the cell, and a transverse oblique row of spots near the apex, deep yellow ; a small spot at the base and another near the middle of the wing indigo-blue ; hind-wing with large yellow spot in its middle, and a semi-transparent spot near the base, the upper half of the latter being yellow ; body black ; face, spot on each shoulder, and underside white ; abdomen with two deep-yellow bands, one being situated at the base, the other on the fourth segment ; top of head, thorax, and margin of the other abdominal segments indigo-blue. Antennae bipectinated. Expanse 1 7/12 inch. Habitat Java (Dr. Horsfield). Remark —This species may be distinguished from P. polymena by the two bands on the abdomen being yellow, whereas in P. polymena there are three bands, and these of a crimson colour. P. horsfieldi is also without the crimson spot in front of the thorax.