Black above, yellowish brown beneath. The antennæ are black, the front, mouth parts and legs yellowish brown. Rarely the femora and tarsi are dusky, and the ventral surface quite dark. Very rarely the dorsal surface is brownish, except the pedicel and tip. The occiput or collar is brown. The antennæ are sixteen-jointed in the female, and seventeen in the male, and are cylindrical, recurved, and thickly set with short, light colored hairs. The first two joints are shorter and larger that the others; the succeeding joints are cylindrical, close together, and equal in length, except the last, which is longer and conical.

Definite Marks of the ♀.—Observation of 62 caught specimens enables me to supplement, in some degree, Mr. Strecker's description. The smallest measures 46 mm., equal to 1.8 inch. The largest is 58.5 mm., or 2.3 inches. The average expanse of the 62 is 52.5 mm., or 2.07 inches. The cell spot above primary is larger than in the males, and has never that semi-obsolete appeaarnce which it presents in some of the males; it varies from a small but definite spot of .5 mm. in diameter to a spot of 1.5mm., is usually sub-rotund, sometimes sub-linearm and is frequently centered with yellow in moderate degree.

Crocota Rosa, nov. spec.

Expanse .80 of an inch.

Upper surface of fore wings, thorax, collar, upper and front of head and terminal joint of palpi pale yellow-brown or fawn color, the only trace of a discal dot is a little duskiness at the end of the cell. Hind wings red, pale, a little dusky, somewhat rosy tinted. Abdoment concolorous with the hind wings; fringes concolorus with the wings.

During nearly fity years the Geological Survey of Canada has been engaged in exploration, and since Confederation it has had practically an unlimited field for its operations. The investagations of the fauna and flora of the Dominion, and the formation of a museum of natural history, are included in the plan of its present organization, but its equipment has hitherto permitted but a partial accomplishment of these departments of its work.

1816—Hübner, Verzeichniss, 192.

1864—Pack., Proc. Ent. Soc., Phil., III., 122.

1874—Strech, Zyg. & Bomb., 191.

The head is small and retracted; tongue obsolete, palpi very small and weak; antennæ moderately long, bipectinated in the male, simple in the female; the pectinations are long and extend to the tip; legs short and weak, all the spurs present, but very short: the two paris of the posterior tibiæ close together. The tarsal claws are as in Spilosoma, and, indeed, there is no structural difference between these two genera. Antarctia has shorter, broader wings, somewhat longer vestiture, and is not white!