Monograph of the bombycine moths of North America, including their transformations and origin of the larval markings and armature . showing the two forks; /(. one of the spines on the ninthuromere. All drawn with the camera to the same scale. Fig. If,.—Armature of Fades imperialis. Stage II. /, end of one of the dorsal j)rothoracichorns; i, one of the dorsal second thoracic horns; t, the caudal horn,or medio-dorsalspine on the eighth uromere. Stage III. d^ one of the second thoracic horns;% the caudalhorn or medio-dorsal sj)iiie of the eighth uromere. All drawn with the camera to the s
Monograph of the bombycine moths of North America, including their transformations and origin of the larval markings and armature . showing the two forks; /(. one of the spines on the ninthuromere. All drawn with the camera to the same scale. Fig. If,.—Armature of Fades imperialis. Stage II. /, end of one of the dorsal j)rothoracichorns; i, one of the dorsal second thoracic horns; t, the caudal horn,or medio-dorsalspine on the eighth uromere. Stage III. d^ one of the second thoracic horns;% the caudalhorn or medio-dorsal sj)iiie of the eighth uromere. All drawn with the camera to the samescale. Stage 1 V.—(Four days after the third molt.) Ijcngth, 40 mm.; width of the head, characters of the full-grown larva are now nearly assumed. The head is, in one specimen,twice banded with pal(^ yc^llowish in front, in another the bands are nearly obsolete and the head MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 123 almost entirely durk chestnut. The two dorsal prothoracic tubercles are now very short, not sohigh as broad, and end in a group of rounded conical spinules; those on the side of tlie same. Fig. 16.—.\ of Eachs imprrialis. .segment having the same general shape. T/>e second and third thoracic segme7its, icith the dorsalhorns^ noro much as in the full-gronni larva, though a little slenderer; length, 5 mm.; they are 124 MEMOIRS OP^ THE NATIONAL ACADEiNIY OF SCIENCES. more eiir\od tliaii before and direeted Ijaekward and provicled with numerous dense conical tulier-cles; tliey are pale yellowish at l>ase, and ros} on the distal half, beeoming black at the? tip, whichis still regularly forked: the two pairs are of the same shape and length. The atidouiinal dorsalspines are much stouter and shorter in proportion than in stage III. The subdorsal (supraspi-racular) spines are simple, conical: the lateral (infraspiracular) spines are very short, and com-posed of four spines. The caudal sjjine (single median dorsal spine on eighth ab
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