98 



MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



plate rounded at the end. The median dorsal tubercles i i on the ninth segment in process of 

 fusion: the two tubercles are separate, though arising from a common !)ase. but minute and each 

 bearing a seta. 



PiijM- — Body moderately stout: the head overhanging tlie mouth-region and base of the 

 antenna'; the maxilhc taken together forming a nearly equilateral triangle, being very much 

 shorter than in Eaclesand Citheronia; cremaster long, deeply forked: surface spinose; two rows 

 of spines on the abdominal segments, the sutures between which are deep and wide; the surface 

 less rugose than in Adelocophala. There seem to be no generic characters, in the pupa, to sepa- 

 rate this genus from Adelocephala, either in the shape of the body, the maxilla?, the cremaster, 

 or the armature in general. See also description of the pupa of Eacles. 



G<-ographleal (lisfrihutnjii. — The majority of the species inhabit the United States and Canada 

 east of the one hundredth degree of longitude; '2 occur in Mexico. It is doubtful whether the 

 genus occurs in South America. (Fig. VI.) 



Stjiionymical hixfory of the genus. — Under Anisota Huel)ner mentions A. j'elhicida, stigma. 

 and senatona. He assigns the genus to a position far removed from the others of its group, 

 between Malacosoma (Clisiocampa) and Streblota. Dryocampa is an exact synonym. 



PJnjhigeiuj. — .Judging by the stripes alone A. senatorio should, perhaps, be regarded as the 

 more primitive form. In this species the dark stripes or lines are developed in stage III, and 

 persist to the end of larval life, where they become the most characteristic style of marking. In 

 A. ruljicitnda. on the contrary, the lines ])ecome wholly or partially obsolete in the last stage. 

 In A. stigma the dai'k lines in stage II are very marked, but thej* are jiartially discarded in 

 stage HI. In A. virginiensis they are already partly blended in stage II. 



It is evident, however, that the armature is preferal)ly to tie depended on to give us a clew to 

 the phylogeny of the genus, which has evidently diverged from Adelijcampa, with its comple- 

 ment of large spines along the entire body. A. stigma, with its longer spines, may be regarded 

 as the most primitive species of the genus. 



The following diagram will serve to express the relationship as well as the phylogenj- of the 

 species of Anisota. 



Rvh/cvncla. 

 Senatoria, 



i//rarni'e/7SfS. 

 Consu/ari's 



/TZeL. 



//t? is o/'a . 



'4 de/o c e ph a fa. . 



Fig. 13. Affiniiies and phylogeny of the species of Anisota. 



li:-!. June 



A.>riSOT^ S'riG-M:^ (FabiiciTis). 

 (PI. XX, figs. 4-9. J 



Bomhyx stigma Fabricius, Sp. Ins., II, p. 

 176,40. Mant. Ins., II, 112, 48. Syst. 

 Ent., Ill, 1 p., 563, no. 2.5, 1775. 



Plidliena stigma Smith-Abbot, X. H. Lep. 

 Ins. Georgia, p. 111. Tab. .56. (1797.) 



Anisota stigma Huebner, VerzeichnisS 

 Schmm., p. 19.3. 1818-1822.— Geyer, 

 Forts. Htilmer, Samml. exot. Schnim., 

 III. PI. 26, figs. 1-4. 1837. 



Dryocampa stigma Harri.s, Rep. Inj. Ins., 

 Mass., p. 292. 1841. Treatise ins. inj. 

 veg., .Sd edit., p. 406. 1862.— Walker, 

 Cat. Lep. Hep. Brit. Mus., VI, p. 1496, 

 No. 11. 1855.— Fitch, Fifth Rep. Xox. 

 Ins., Xew York, p. 46. 1859. — Morris, 

 Synopsis Lep. X. Amer., p. 231. 1862. 

 1864.— Pack.\rd, Proc. Ent. Soc. Phil., Ill, p. 385. 



Anisota stigma Grote, Proc. Ent. Sor. Phil., Ill, j: 

 Xov., 1864. 



Adelocephala sti/gma BoisD., Annales Soc. Ent. Belgique, XV, p. 86. 1872. 



Anisota stigma Packard, 5th Rep. U. S. Ent. Comui., insects inj. forest trees, p. 125. 1890.— Kirbv, Syn. Cat. 

 Lep. Het., I, p. 739. 1892.— Neumoegen" and Dyer, Journ. X. York Ent. Soc, II, p. 147. Dec, 1894.— 

 BEi-TEXMt?LLER, Cat. bombycine moths, X. York, p. 439. PI. xx. fig. 4 <y . 1898. 



