( 106 ) 



structure iiiul cdldiir oi' tlic larva docs not sjx'.ik ui^aiiist the insects lieiiig united 

 under one generic term. The dissimilarity is not an ex])ressi()n of dilt'erent origin 

 of the forms, but of adaption of jjliylogeuitically tlie same forms in different 

 directions. As a matter of course, there is some justification in pleading that each 

 of these species represents a genus of its own ; but we reject sncii a procedure, as 

 it would necessitate, if consequently carried out, the erection of a genus for practically 

 every sjiecies, and would lead in the end to a mere shifting of terms, genus being 

 substituted for species, and species for geograj)liical race (subspecies). 



I'npa : tongue-case not projecting, not reacliing to end of wing-cases, except 

 aim/ntor. 



The sexual armature confirms tlie relationship of Ceratomiit. with 1 sog ranunn 

 and Chlaenogramma . 



Ilnb. Eastern parts of the Nearctic Region. 



Three species. 



Key to the species : 



a. Postdiscal band of hindwing, below, sliarply 



deutate Ij. 



Postdiscal band of hindwing not dentate . . 81. ('. cutalpae. 



b. Pale fringe-spots of forewing very much siualler 



than the brown spaces between them . . 70. C (imi/ntor. 



Pale fringe-sj)ots of forewing the same size about 

 as the brown spaces between them . . .80. ('. iiii(hdo!i<i. 



79. Ceratomia amyntor. 



Agriua amyntor Hiibner, Samml. Ex. Schm. ill. t. 39 (1824?). 



Ceratomia quadricornis Harris, in Sillim., Journ. Sci. Art xxxvi. p. 29.3 (1839) (I. on Ulmus 

 americaiia) ; id., Jus. Inj. Vfget. p. 227 (1841) (/.,;j.) ; Walk., LiM Leji. his. B.M. viii. p. 258 

 (185G) (Mass.) ; Clem., Journ. Ac. Nat. Sci. Philad. iv. p. 179. n. 82 (1869) (Mass. ; Penn. ; 

 Michig. ; l, p.) ; Morris, Cat. Lep. N. Am. p. 20 (1860) ; Clem., in Morris, Syn. N. Am. Lep. 

 p. 205 (1862); Pack., Rept. N. Hist. & Geol. 31aine ii. p. 167 (1862); Lint., Proc. Ent. Sac. 

 Philad. i. p. 286 (1863) (metam. ; Ulmii.^) ; Jaeg., Life N. Am. Ins. p. 192 (1864) ; Lint., Proc. 

 Ent. Sac. Philad. iii. p. 664 (1864) (pupa) ; Harris, Ent. Corresp. p. 282 (1869) (/., p.) ; Andr., 

 Canad. Ent. viii. p. 40 (1876) (Brooklyn, brown /.) ; Bunk., ibid. viii. p. 120 (1876) 

 (Rochester, N.Y., brown L, Engl. Elms) ; French, T?-ans. Dept. Agric. lllin. xv. p. 167 (1877) : 

 Fletch., Caiuid. Ent. xii. p. 212 (1880) (Ottawa); Mart., Trans. Dept. Agr. lUin. xviii. App. 

 p. 102 (1880) (larva) ; Hag., Papilio iii. p. 61 (1883) {quadr. to be retained) ; Harris, ed. Flint, 

 Ins. Inj. Veget. p. 323. fig 148 (1883). 



Ceratomia amyntor, Grote & Rob., Proc. Ent. Soc. Philad. v. p. 164. 190 (1865) ; Beth., Canad. Ent. 

 i. p. 71. n. 2U (1869) (Canada) ; Minot, ibid. ii. p. 28 (1870) (egg, I.) ; Bowl., ibid., iii. p. 143 

 (1871) (Quebec, vi.) ; Lint., Ent. Contr. i. p. 192 (1872) (N. York, i.: vi. B. vii., viii.; /. : 

 B. viii. ix.); Thaxt., Ps^cAe i. p. 30 (1874) (Mass., e. vi.— b. vii.): Grote, Bull. Buffalo Soc. 

 N. Sci. i. p. 24 (1874) ; id.. I.e. ii. p. 227. n. 46 (1875) ; Caulf., Canad. Ent. vii. p. 241. n.'ll (1875) 

 (Montreal, common, vi.) ; Boisd., Spec. Gen. Up. Ilet. i. p. 53. t. 1. f. 2 {I.) (1875); Butl., 

 Tranf. Zool. Soc. Land. ix. p. 621. n. 1 (1877) (Mass., Mexico!) ; Grote, I.e. iii. p. 224. n. 47 

 (1877) (Canada ; Mass. ; Penn. ; Mich.) ; Pil., Papilio ii. p. 66 (1882) (Dayton, O., not rare) ; 

 Good., Psyche iii. p. 368 (1882) (Mass. ; Ulmus, Betula) ; Reed, Rept. Ent. Soc. Ont. xii. p. 64 

 (1882) (larva) ; Druce, Biol. Centr. Amer., Lep. Net. i. p. 24 (1883) (N. Am. ; "Mexico" teste 

 Mus. Brit.) ; Fern., Canad. Ent. xvi. p. 21 (1884) (Orono, Maine, rare) ; id., Sphing. N. Engl. 

 p. 24. n. 9 (1886) (metam.); Grote, Hawk Moths N. Am. p. 38 (1886); Smith, Trans. Amer. 

 Ent. Soc. XV. p. 201. t. 10. f. 5. 6 (genit.) t. 11. f. 1. (leg) (1888) (Canada to Virginia, westw. to 

 Missouri, Iowa) ; Edw., Bull. U. St. Nat. Mus. xxxv. p. 44 (1889) (lit. rel. to metam.) ; Pack., 

 U. St. Dept. Agr., Rpt. Ent. Comm. v. p. 242. n. 28. t. 11. f. 1 (/.) (1890) (metam.) ; Dyar, in 

 Riley, Ins. Life iii. p. 322 (1891) (N. York, electr. light) ; Kirby, Cat. Lep. Het. i. p. 695. n. 1 



