102 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



nal stripe of a paler color and having a dingy carneous hue; a narrower .substigmatal stripe of 

 the same hue. Horns and spines black and marked with white papillse, and with a tendency to 

 branch, especially toward the tips; the longer horns on joint 2 V)eing blunt pointed, and also with 

 white papillte at the base. Head uniformly gamboge-yellow; cervical shield, anal plate, and 

 plates on anal prolegs of the same yellowish color as head. A pale medio-ventral line; the tho- 

 racic legs pale, the prolegs with pale papilhc outside on a dark ground. 



"The species is at onee distinguished from the other species of the genus by the longer 

 spines, their tendency to furcation, and being speckled with white papillie, and by the less dis- 

 tinct striping."' (Riley.) 



Aherrations in the Jarva. — In diiierent larval stages the following monstrosities or defects 

 were observed: One is represented on PI. LI, tig. 2,«v, where the right dorsal horn in Stage III is 

 about one-half as long as its mate and proportionately thicker; tig. )>,<( of the same plate repre- 

 sents at c a shortened thoracic horn (Stage IV;), as compared with d, a normal spine; at a a 

 third dorsal, and at ^' an abnormal second dorsal tubercle of a larva 12 mm. in length. 



Food plan ts. — Oak . hazel . 



Habits. — The larva of A. stiyma is said bj' Doctor Riley to be nearly- as destructive in the 

 Southern States as A. xenatoria is in the Northern. 



According to Abbot and Smith, in Georgia the caterpillar goes into the gromid to pupate 

 September 20 and comes forth by the middle of June following. The young at tirst keep 

 together and as they grow larger disperse. 



The following quotations are from Riley's unpublished notes in Packard's Forest Insects: 



"Found feeding on oak and hazel at St. Louis, ISIissoui'i, by Professor Riley, on hazel in Illi- 

 nois, b}' Mr. Muhlemann, and on both oak and hazel by Mr. Saunders, London, Ontario. Moths 

 issue from middle of May to middle of June. Eggs were noticed to hatch July 10. Went through 

 the tirst two molts till July 20. and through third molt July 27. The tirst larva entered the 

 ground August •!. and the last one August 22, 1870. These are specimens from Canada, but 

 aroimd Kirkwood, Missouri, there are some found which are not vet full grown at this date. 



"Mr. Saunders says, November 21, ls7<J, that he has noticed a second brood. 



"According to Abbot and Smith this is the more spotted moth, and their larva agrees witli 

 mine, but is colored too yellow. Their larva of A. jx'lhicitJa seems to differ principally in having 

 two pink longitudinal vitta?, each side. The male and female of A. xtigma are almost alike, 

 while in A. pellucida they are unlike. Both are sometimes found on the same tree. 



"Dr. Asa Fitch states that his little daughter was stung badly by a larva which he had 

 feeding under a glass; but, notwithstanding that a slight stinging sensation is disceriiibl(>. it can 

 not be likened to that of the true stinging larva? and is not more irritating than the prickly 

 spines of Yanessa interrogationis.''' 



Geographical distribution. — Boston, Mass. (Harris); London, Canada (Saunders); Rhode 

 Island (Dearden); New York (Fitch, Grote, Joutel, Beutenmiiller); New Jersey (Smith); 

 Columbus, Ohio (W. N. Tallant); Southern Illinois (French); Springtield. 111. " (June 3(t, 

 July 1); St. Louis, Mo. (Riley); North Carolina (^lorrison); Georgia (Abbot); Kansas (Marlatt). 



It probably ranges throughout the Appalachian and Austroriparian subprovinces as far west 

 as the one hundredth meridian; but its exact northern, northwestern, and southwestern limits 

 remain to be defined. (See Map Y.) 



(PI. XX, flgs. 1, 2, :i) 



Boiuhjix rirginiensis Drvry, Illustrations Exot. Ent. Append., II, ji. '23, I'l. xiii, fig. -. 177.3. 



Bombiix asli/nome Olivier, Eneyc-l. Meth., V, p. 4.3, No. 73. 1789. 



Phakrna pellucida Smith-Abbot, Nat. Hi.st. Lep. Ins. Georgia, p. 11.5, Tab. .58. 1797. 



Dryocamjja t)i>(/m(e>j«i« Westwood, Edit. Drury, 111., II, p. 24, Tab. XIII, fig. 2. 1837. 



Dnior.ainpa pellucida Harris, Rep. Inj. Ins. Mass., p. 293. 1841.— Fitch, Fifth Rej). Nox. Ins. New York, 



p. 44. 18.59. 

 Dryocampa riryinleiDiia W-KhKER, Cat. Lep. Het. Brit, iliis.. \1, \>. 1496. 1.S5.5. 

 Dryocampa pellucida Morris, Syn. Lep. N. Amer., \>. 232. 1862. 



