In my article in Canadian Entomologist, 1893, pp. 7–8, as also in my previous note in Science, Vol. XIX., 1882, p. 320, I stateed that Hyalt and Arms were the first to point out that the Diptera were the most highly specialized insects, and consequently to be considered the highest in rank. It should be noted, however, that the same idea was advanced at the same time by the renowned insect anatomist, Mr. B. T. Lowne, well known for his work on the anatomy, etc., of the blow-fly.