On July 9, 1907, in Ithaca, N. Y., the writer captured a female specimen, which when placed in the cyanide bottle, immediately deposited several larvae on the side of the glass. The species is therefore larviparous, like other Sarcophagids. As the adult of this species has several striking characteristics, it was possible, even at that date, and before the appearance of Aldrich's monograph (1916) to determine it by means of the original description of Francis Walker (1849), under the name of Sarcophaga vigil. Though not common in Ithaca, I have taken a few specimens of the fly nearly every season since 1907, and always in a similar situation, that is, on a cement walk, in the bright sunshine, about midday, during June, July and August. The larva of the first instar measures 2.3 mm. in length, by 0.4 mm. in width in the region of the fifth or sixth abdominal segment. The upper pair of tubercles (or antennae of Portchinsky) of the pseudocephalon, are well defined, 30,u in length, two-segmented, the first segment about as long as broad, the second somewhat longer than broad, and conical. The mandibular hooks are slender, sharply pointed, and much curved, though less so than those figured for Wohlfahrtia magnifica Schiner by Portchinsky (1884). He states that in the first instar of the last mentioned species there is a large median hook placed a little higher than the laterals. In W. vigil there is no indication of this median hook. As it is scarcely conceivable that so experienced an observer as Portchinsky should mistake a portion of the pharyngeal skeleton for a median hook, we must conclude that W. magnifica differs from the American species in this particular. As in the first instar of the house fly larva the anterior spiracular processes are lacking. The posterior spiracles are in a pit and each has two slits which lie parallel to each other, approximately perpendicular to the horizontal plane, supposing the larva to be lying ventral side down in a horizontal position. The spinules on the body are rather larger and more numerous than indicated by Walker (1920) for the second and third instars, though less widely distributed than described by Portchinsky (1875) for W. magnifica. In my specimens the anterior third of the second