I desire to call the attention of Entomologists to a very valuable contribution to Entomological literature recently made by Lord Walsingham. The work is entitled Pterophoridæ of California and Oregon, and is published in an octavo volume very neatly gotten up, and containing sixty-six pages of letter press, fully illustrated by forty-eight colored figures on three plates. Forty-one species are figured, of which three do not belong to the Pacific fauna as far as known, but are given for convenience of comparison. Twenty-seven new species are described.