MEMOIRS OK TUK NATIONAL ACADEMY OF SCIENCP:S. 119 



Si/notii/m/cal hislari/. — Altluuiiili Diiuc places the species of Cithcronia under Eacles, and 

 Kirliv lumps them under Citheronia, the two ^"-enera are liotli in their larval. pui)al. and adult 

 characters ([uite distinct, as may bo seen tiy reference to our descriptions and tii>ures, ji;iving 

 structural details. The palpi ha\e but two joints, the antenna are more broadly pectinated. 



lliibner's type of the g'oiuis, i. e., the species first named, is E. hnperiaUx; ho then adds two 

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

 resurrected. 



Geographical diMrihutlon. — Arctogceic (North American) and Neof^'jea; the species ranging 

 along the Atlantic coast region from Maine and Canada, and the vallej' of the Mississippi, to 

 southern Brazil. 



E.A.CLES IMPEFil^LIS (Urtiry). 



\\'\. XVIII, fig. 5.) 



Phalsena (Attacus) imperialh Drury, Illustr. Exot. Ent., I, p. 17 (App. II), pi. !), figs. 1, 2. 1770. 



Bomlii/x imperial is Fabricus, Species Ins. II, 181, 62, 17S1; Mant. Ins., II, 116, 79. 1787. Ent. Syst., Ill, I, 



p. 435, No. 89. 179.3.— G.MELiN, Edit. Linn. Syst. Nat., I, 5, 2417, .510.— Stoll, Suppl. Cramer, ji. 178, 



Tab. 42, fig. 1. 1790. 

 Phalieixi impenitoria Abbot and S.mith, Lep. Ins. Georgia, p. 109, Tab. 55. 1797. 

 Bomhyx didyma Be.\ivois, Ins. Africa .\m^r., p. 52, Tab. 20. 1805. 

 Faciei iiiiperatoria Hf bxer, Verzeichniss Sclimett., p. 153. 1818-1822. 

 Ceraiocampa imperialls, H.\rris, Cat. Ins. ^lass.. Appendix to Hitchcock's Geology Mass., p. 592. 1834. 



Second edit. 1855. — Westhood, Edit. Drury III. Exot. Ent., 1, p. 17, pi. 9, fig. 1, 2. 1837. — Harris, 



Rep. Inj. Ins. Mass., p. 287. 1.S41. Tliinl edit., fig. 196, 197. 1862.— Du.ncax, Naturalists' Libr., XXXII, 



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

 Eacles imperialls Walker, Cat. Lep. Het. Brit. Mus., VI, p. 1371. 1855. — Pai kakd, Proe. Ent. Sue. Pliil., 



Ill, p. 381. Nov., 1864. * 



Bagilona imperialls Boisduval, Annales Soc. Eut. France (4), VIII, p. 318. 1868. 

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



May, 1882. 

 Ceratocaiiipa {Basilona) imperialis Bur.meister, Descr. pliys. Rep. Argentine, V, p. 489. 1878; Atlas p. 46, 



PI. .x.x, fig. 2. 1879. 

 Eacles imperi'ills Druce, Biol. Centr. Amer. Lep. Het., II, p. 412. Sept., 1897. 

 var. 7J!mc/(((/.«.?(nia Nevmoegen, Eut. News, II, p. 150. 1891. 

 var. nobllis, Nei'moege.n, 1. c, p. 150. 1891. 

 Basilona imperialls Neu'moegen and Dvar, Journ. N. Y. Ent. Soc, II, p. 151. Dec, 1894. 

 Eacles imperialls BEiTEXMiJLLER, Bull. Amer. Mus. N. H., X, p. 442. 1898. 

 Basilona imperialis Dv.\R, List. N. Amer. Lep., p. 76. 1902. 



Larra. 



(Pis. IX, XXVII. XXVIIl.) 



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



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



Llntner, 24th Rep. N. Y. State Cab. Nat. Hist., p. 150. 1870. 



Packard, Proc. Amer. Philos. Soc Phil., XXXI, p. 157, all stages, pi. vi. 189.3. 



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



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

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



Fore wings yellow, with distinct basal and extrabasal pale lilac lines. In two $ 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 bi'oad and deeply zigzag. Two round spots near the middle of the wing, one discal, 

 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, slightly 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 strigffi; base of wing either clear, so that the broad basal zigzag line is distinct, or the line 



