_Upper Side._ Antennæ pectinated, and of a yellow clay colour. The head and thorax yellow, but covered over with hairs in such manner that the former cannot be distinguished. The abdomen, superior and inferior wings yellow. On the anterior wings appear some very minute black spots scattered thereon in a very irregular manner. The wings are entire. _Under Side._ The thighs, breast, and abdomen are very hairy. The superior and inferior wings of the same yellow colour as on the upper side, without a mark of any kind. This insect appears most nearly to approach the genus Limacodes, _Latr._ SATURNIA CECROPIA. Plate XVIII. fig. 2. ORDER: Lepidoptera. SECTION: Nocturna. FAMILY: Bombycidæ. GENUS. SATURNIA, _Schrank. Latr._ Attacus, _Germar._ Phalæna (Bombyx), _Linn. &c._ SATURNIA CECROPIA. Alis anticis subfalcatis, posticis rotundatis; omnibus griseis fasciâ communi fulvâ maculâque reniformi ocelloque apicali (in anticis) ornatis. (Expans. Alar. 6 unc. 6 lin.) SYN. _Linn. Syst. Nat. v._ 2. _p._ 809. _No._ 3. _Cramer, Ins._ 4. _tab._ 42. _f._ A. B. _Catesby Carol._ 86. _t._ 86. _Abbot and Smith, Ins. Georgia, tab._ 45. _Fabr. Ent. Syst._ III. 1. _p._ 408. _No._ 4. _Gmel. Linn. S. N._ 2401. 3. _Oliv. Enc. Méth._ 5. _p._ 25. 5. HABITAT: New York (_Drury_). North America (_Linn. &c._). _Upper Side._ Antennæ very broad, pectinated and black. The head is small and red. Neck white. Thorax covered with long orange-brown hairs. Abdomen alternately with broad stripes of white and orange brown, the latter being edged behind with black. Anterior wings, with two bars crossing from the anterior to the posterior edges, one at about three-fourths of an inch from the shoulders, whitish, edged on the outside with black; the other is orange, at about an inch distance from the external margin. The base of the wing is a fine orange brown. The middle is deep rusty brown, which, towards the upper part, is powdered with buff-coloured hairs. In the middle of this is a large white spot verged with black, somewhat resembling a kidney bean, and is broadly tinged behind with red brown. The extremity of this wing, next the bar, is the same dark brown, and powdered, having a black spot about {33}half an inch from the tip, having within it a semicircular mark of a pearl colour. From this spot to the anterior edge runs a serpentine line of white, bordered on the outer side with red. Between this and the orange bar is a broad tinge of light purple. The other side, next the tip, is light brown, stained with blood colour. From the black spot to the interior angle runs a black serpentine line, inclosing a space of dark buff, between which and the dark buff margin is a light buff irregular streak. Posterior wings similar to the superior, but the orange bar is redder and broader, running parallel with the external edge, and is bordered on the inner side with white; the part