At the meeting of the Entomological Club of the A. A. A. S., held in August, 1891, at Washington, Dr. Riley called attention to the habits of _Melitera prodenialis_ Walker. The larvae burrow into and feed upon the fleshy leaves of the prickly pear, _Opuntia_. Dr. Riley’s specimens came from Florida. Prof. J. B. Smith has recently bred the moth from the prickly pear in New Jersey. His notes were presented at the same meeting of the Club, and the brief references to the interesting notes of Doctors Riley and Smith, made in the Canadian Entomologist (v. xxiii, num. 11, pp. 242 and 256), suggest the presentation of the following notes on _Melitera dentata_ Grote, the western species of this Phycitid genus. Chancellor F. H. Snow, of this University, while investigating a grasshopper “outbreak” (_Dissosteira longipennis_) in eastern Colorado in July, 1891, noted the withered and dying condition of many leaves of the common prickly pear cactus (_Opuntia missouriensis_), and on examining the leaves found in them certain large, naked, bluish larvae. The larvae were imbedded in the fleshy leaves, eating away the soft inner tissue. The hollowed-out spaces were nearly filled with irregularly spherical, yellowish, translucent casts. The attacked leaves were withered and brown without. Prof. Snow took a few leaves and larvae on July 16, near Arriba, Colorado, and brought them to the laboratory. The larvae were put into breeding-cage on July 18. On July 28 one larva had spun up and pupated in a corner of the cage behind a small porcelain dish. Another had made a cocoon in a broken, empty pupa-case of _Eacles imperialis_, but died before pupating. On August —— the adults appeared, and have been determined by Prof. J. B. Smith as _M. dentata_, Grote. As I am aware of no description of the earlier stages of this species, I record the following notes of description: EGG. About 1-1.2 millimeters in diameter, surface with broad, meridian-like furrows from one pole for about one-third of the distance to the other pole. Color, creamy white.