MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 119 



Synonyitucal history. — Although Driice places the species of Citheronia under Eacles, and 

 Kirby lumps them under Citheronia, the two genera are both in their larval, pupal, and adult 

 characters quite distinct, as may be seen by reference to our descriptions and figures, giving 

 structural details. The palpi have but two joints, the antennte are more broadly pectinated. 



Hiil)ner"s type of the genus, i. e., the species first named, is E. imperkdis,' he then adds two 

 other species. Basilona of Boisduv.d is a synonym of Eacles, and the name need not have been 

 resurrected. 



Geographical dhtrUndum. — Arctogteic (North American) and Neogtea; the species ranging 

 along the Atlantic coast region from Maine and Canadst, and the valle}- of the Mississippi, to 

 southern Brazil. 



EACLES IMFERIALIS (Di-ury). 



(PL XVIII, tig. 5.) 



Phalmna {Atlacus) iinperlalis Drurv, Illustr. Exot. Ent., I, p. 17 (App. II), pi. 9, figs. 1, 2. 1770. 



Bomhyx imperlaUs Fabriciu.s, Species Ins. II, 181, 62, 1781; Mant. Ins., II, 116, 79. 1787. Ent. Syst., Ill, I, 



p. 435, No. 89. 1793.— Gmelix, Edit. Linn. Syst. Xat., I, .5, 2417, .ilO.— Stoll, Suppl. Cramer, p. 178, 



Tab. 42, fig. 1. 1790. 

 Phalxna imperatmia Abbot and S.mith, Lep. Ins. Georgia, p. 109, Tail. 5.5. 1797. 

 Bomhyx dkhjma Beauvois, Ins. Africa Ainer., p. .52, Talj. 20. 1805. 

 Encles iiiiperatoria HPbxer, Verzeiciiniss Sciimett., p. 153. 1818-1822. 

 Ceralocampa hnpei'ialis, Harris, Cat. Ins. JIass., Appendix to Hitchcock's Geology Mass., p. 592. 1834. 



Second edit. 18.55.— Westwood. Edit. Drnry 111. Exot. Ent., I, p. 17, pi. 9, fig. 1, 2. 1837.— Harrls, 

 ' Rep. Inj. Ins. Ma.ss.,p. 287. 1841. Third edit., fig. 196, 197. 1862.— Duncax, Naturalists' Libr., XXXII, 



p. 161, pi. 17, fig. 1. 1841. 

 Eacles imperialk Walker, Cat. Lep. Het. Brit. Mas., VI, p. 1371. 18.55. — Packard, Proc. Ent. Soc. Phil., 



Ill, p. 381. Nov., 1864. 

 Basilona i»i/ier(aZis Boisduval, Annales Soc. Ent. France (4), VIII, p. 318. 1868. 

 Eacles imperkdis Grote, List Lep. N. Amer., I, p. xiii. Sept., 1868; New Check List N. Amer. Moths, p. 20. 



May, 1882. 

 Ceratocampa (Basilona) imperialis Bur.meister, Descr. phys. Rep. Argentine, V, p. 489. 1878; Atlas p. 46, 



PI. XX, fig. 2. 1879. 

 Eacles imperialis Deuce, Biol. Centr. Amer. Lep. Het., II, p. 412. Sept., 1897. 

 \a.r. punctati.isima Neumoegen, Ent. News, II, p. 150. 1891. 

 var. no6i7(s, Neumoegen, 1. c, p. 1.50. 1891. 

 Basilona imperialis Neu.moegen and Dyar, Journ. N. Y. Ent. Soc, II, p. 151. Dec, 1894. 

 Eacles imperialit: BEUTESMtJLLER, Bull. Amer. Mus. N. H., X, p. 442. 1898. 

 Basilona imperialis Dy.^e, List. N. Amer. Lep., p. 76. 1902. 



Lana. 



(Pis. IX, XXVII, XXVIII.) 



Abbot and Smith, Lep. Ins. Georgia, p. 709, Tab. 55. 1797. 



Harris, Treatise Inj. Ins. Mass., third edit., p. 403, fig. 197. 1862. 



Lintner, 24th Rep. N. Y. State Cab. Nat. Hist., p. 1.50. 1870. 



Packard, Proc. Amer. Philos. Soc. Phil., XXXI, p. 157, all stages, |)1. vi. 189.3. 



Felt, 7th Rep. Forest, etc., Comm. N. Y., pi. 13, fig. 1. 1903. 



Lnayii. — 3 ^ 2 9 . Head and thorax in front yellow. Body behind and wings bright yellow, 

 marked with pale lilac. Disk of thora.v and at insertion of the wings pale lilac. 



Fore wings j^ellow. with distinct basal and extrabasal pale lilac lines. In two S the space 

 between the basal line and insertion of the wing is filled in with lilac, but in the 9 it is clear: the 

 line is broad and deeply zigzag. Two round spots near the middle of the wing, one di.scal, 

 the other smaller and situated between the discal spot and the costa; each with the center paler. 

 Extradiscal line broad, distinct, scalloped on the inner edge, slighth' incurved, beginning on the 

 outer third of the inner edge of the wing and ending on the apex; in some males the space 

 between this line and the outer edge of the wing is more or less filled in with pale lilac. 



Hind wings like the fore wings in color, distinctly speckled with round or elongated dots 

 and strigw; base of wing either clear, so that the l)road basal zigzag line is distinct, or the line 



