154 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxi. 



Stage VI. — Head whitish behind, mottled with brown and shaded 

 with black in a diffuse band fioin the ocelli upward and on each side of 

 the clypeus; month parts and under side of head largely black, shining; 

 width, 3.3 mm. Body cylindrical, tapering slightly, joint 12 a little 

 enlarged. Wart I as large as the others, IV minute. Body strigosely 

 mottled with black and white, the black predominating and becoming 

 continuous centrally on the segments and adjoining the narrow, broken, 

 yellow dorsal line. Broad subdorsal and substigmatal lines, the former 

 broken and obsolete anteriorly, yellowish white, pale red in tlie middle. 

 Warts pale, with fleshy tint. Long hairs, i)ale, slender; those from 

 warts I and II shorter and more spiny, the warts nearly in line trans 

 versely; a few long black hairs at the extremities. Thick tufts of 

 plumed hairs, black brown from warts I and II on joint 5; divergent 

 black pencils from the closely approximate warts I and II on joint 12; 

 dense shorter white tufts from I and II on joints 3 and 4, III on 5, I to 

 III on G, a few hairs from III on 9 or 9 and 10, moderate from III on 

 12, a few hairs from Avart III on 13. 



Stage VII. — Head whitish brown, a black line at tlie edge of the 

 clypeus and a patch before the eyes. Body marked as before, but the 

 narrow yellowish dorsal line runs through a series of velvety brown 

 patches; the pale bands may be yellow or red. Warts all pale; spira- 

 cles white with black rims. Wart I bears some stiff bristles: long 

 hairs from the extremities; lateral hairs soft, barbuled, mixed with 

 stiff" bri.stles. Tufts all tine, light pinkish brown, like the color of new 

 leather; those from warts I and II on joints 5 and 12 a little darker in 

 shade. There are small tufts from warts III on joints 7 to 10. Venter 

 and feet pale. In another example the white and black tufts ])ersisted 

 in the last stage. Another larva had but six stages with the following 

 widths of head: 0.35, 0.6, 1.0, 1.9, 3.0, and 4.8 mm. 



Cocoon. — Formed between leaves, comi)osed entirely of silk, firm. 



Pupa. — Cylindrical, the posterior fixed abdominal segments abruptly 

 tapering; posterior margins of the segments with smooth, shining, 

 slightly elevate<l rims. All coarsely wrinkled, the abdominal segments 

 in front thickly covered with large conical elevations; cremaster 

 tapering, concolorous, with a bunch of dense, numerous, stiff bristles 

 projecting backward. Color, blackish brown. Length, 18 mm. 



Food plantH. — Birch, apple, walnut, oak, willow, poplar, elm, choke 

 cherry, cherry, linden, ash. 



ACRONYCTA SPERATA Grote. 

 (Plates II, fig. 6, adult; VIII, figs. 31, 32, larva; XXII, fig. 3, male genitalia.) 



Acronycta sperata Grote, Bull. Buff. Soc. Nat. Sci., 1873, I, p. 81, pi. ii, fig. 1. 



Arctomyscifi sperata Grote, Papilio, 1883, III, p. 113. 



Pharetra sperata Grote, Mitth. a. d. Roem. Mus., Hildesh., No. 3, 1896, p. 7. 



Ground color a dirty, powdery ash gray. Head and thorax without 

 definite markings. Primaries, with all the markings, smoky and rather 

 obscurely defined. Basal line geminate, marked on the costa only. 



