76 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxi. 



LARVA. 



Riley, Rull. Bkln. Ent. So«^, 1881, VII, p. 2.— Packard, Fifth Rept. U. S. Kut. 

 Comrn., 1890, p. 495. 



Stage IV. — Width of head, 1.35 mm. Green; the warts yellow. A 

 dorsal yellow line, faint and broken, with traces of a subdorsal one on 

 the thorax. Dorsally on joints 5, 8, 0, and 12, and faintly on 11, small 

 brown patches surrounded with yellow, most distinct on the sides. 

 Dorsal hairloiij;, dark, a central seta with a crown of short hairs from 

 each wart. .loints 5 and 12 slightly enlarged. 



Stage V. — Head green, with purplish mottlings on the lobes, the 

 apices pale brown; width, 2.2 mm. Body green, the warts and dorsal 

 line yellow on joints 4 to 12, yellow elliptical patches covering warts I 

 and II on joints .5, 8, 1>, and 12, with red centers; a red dot on joint 11. 

 Only a trace of the subdorsal line on joints 3 and 4. Skin granules 

 sparse, with short pile and a few true secondary hairs. Primary hairs 

 few. Later the dorsal brown dots become more numerous, small on 

 joints 4, 0, 7, large on 8, 0, small on 10, 11. Dorsal line enlarged to 

 include tubercle 1 on joints 8 and 9, I and II on joints 5 and 12. 



Stage VI. — Head pale brownish, thickly mottled with black spots 

 above, the apices of the lobes orange; width, 3 to 3.7 mm. Body, dull 

 olivaceous brown; minute brown black skin thorns on a greenish 

 ground. No marks on the skin exce])t a faint, i)ale dorsal line. Joints 

 5 and 12 a little enlarged dorsally, 12 square. Warts small, few haired, 

 I and II black, but with pale haii- tubercles, tlie other warts pale green- 

 ish; all pale on joint 13. Hair short, black and white; secondary hairs 

 present only subventrally, but rather abundant there, pale. 



Cocoon. — " Web up in a piece of old wood or between leaves." (Kiley.) 



Pupa. — Cylindrical, regularly gently tapering, the abdominal seg- 

 ments punctured }b front; smooth, shining brown, the wing cases 

 finely transversely wrinkled. Cremaster short, nearly sessile, several 

 longitudinal ridges above and below at the margin. No dorsal hooks, 

 the lower row in a close series of six, corresponding to three on each 

 side, but not separated. Length, 17 mm.; width, 8 mm. 



Food plant. — Birch. 



ACRONYCTA MORULA Grote and Robinson. 



(Plates II, fig, 10, adult; VII, tigs. 20, 21, larva; XIV, figs. 7, 13, thorax and male geni- 

 talia; XV, figs. 12, 17, head; XVII, fig. 20, leg; XX, fig. 7, male genitalia.) 



Acronycta morula Grote and Robinson. Trans. Am. Ent. See, 1868, II, p. 196, pi. 



Ill, fig. 7.5.— LiNTNER, Ent. Cent., 1878, IV, p. 137. 

 Apatela morula Thaxter, Papilio, 1883, III, p. 13.— Grote, Papilio, 1883, III, 



p. 67. — Packard, Forest Insects, 1890, p. 272. 

 Hyhoma morula Ghote, Mitth., a. d. Roem. Mus., Hildesh., No. 3, 1896, p. 7. 

 Acroni/cta ulmi Harris, Ent. Corresp., 1869, p. 312.— Smith, List Lepidoptera, 

 1891,p..35, pr. syn. 

 Ground color a pale ashen gray, with a yellowish tinge. The thorax 

 has the disk distinctly yellow, the collar is usually brown-tipped, and 



