102 MEMOIKS OF THE NATIONAL ACADEMY OF SCIENCES. 



iiiil Jitripo of a paler color and haviiij^' a dingv cariieous hue; a narrower suh.stigiiiatal stripe of 

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

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

 white papilla' at the base. Head unifonidy gamboge-yellow; cervical shield, anal plate, and 

 plates on anal prolegs of the same 3'ellowish color as head. A pale medio-ventral line; the tho- 

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



'^ The species is at onee distinguished from the other species of the genus V)v the longer 

 spines, their tendency to furcation, and being speckled with white papilhv. and liy the less dis- 

 tinct striping.'' (Riley.) 



Aherrations in the larva. — In diti'erent 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. 2« of the same plate repre- 

 sents at c a shortened thoracic horn (Stage IV'O, as compared with rZ, a normal spine: at a a 

 third dor.sal, and at h an abnormal second dorsal tuln-rcle of a larva 12 nun. in length. 



Fodd plants. — Oak, hazel. 



Ilah'itx. — The larva of A. .stigina. is said by Doctor Kiley to be nearly as destructive in the 

 Southern States as A. senatoj'ia is in the Northern. 



According to Abbot and Smith, in Georgia the caterpillar goes into the ground 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 unpulilished notes in Packard's Forest Insects: 



" Found feeding on oak and hazel at St. Louis, Missouri, bj- Professor Riley, on hazel in Illi- 

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

 issue from middle of May to middle of June. Eggs were noticed to hatch Jul}^ 10. Went through 

 the first two molts till July l'i>. and through third molt July 27. The tirst larva entered the 

 gromid August 4, and the last one August 22, 1870. These are specimens from Canada, but 

 around Kirkwood, Missouri, there are some found which are not yet full grown at this date. 



"Mr. Saunders says, November 21. ls7o, that he has noticed a second })rood. 



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

 mine, but is colored too yellow. Their larva of ^4. ji<>lliicl(Iu seems to differ principally in having 

 two pink longitudinal vitta?, each side. The male and female of ^1. xtigutii 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; i)ut. notwithstanding that a slight stinging sensation is discernible, it can 

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

 spines of Yanesaa inti rnxiatidtilK."' 



(ieograpldcal dlstrihutidii. — Boston, Mass. (Harris); Loudon, Canada (Saunders); Rhode 

 Island (Deardcn); New York (Fitch, CJrote, Joutel, BeutenmiiUer); New Jerse_y (Smith); 

 Coluni})us, Ohio (W. N. Tallant); Southern Illinois (French); Springfield, 111. (June 30, 

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



It |)robably ranges throughout the Appalachian and Austroriparian subprovinces as far west 

 as the one hundredth meridi:ni; but its exact northern, northwestern, and southwestern limits 

 remain to be detined. (See Map Y.) , 



^ISriSOTA. A'IRrTl>^IE>fSIS (Drvu-y). 



« 

 (PI. XX, fitrs. 1, 2, :!.) 



Bumbi/j- rirginieiui'! Ducky, Ilhistratious Exot. Ent. Ajipend., II, ]i. 2.3, I'l. xui, tig. 2. 1773. 



Bomhijx asli/nome Olivier, Encycl. M^th., V, p. 43, No. 73. 1789. 



PftatenapeHuada Smith-Abbot, Nat. Hist. Lep. Ins. Georgia, p. 115, Tali. 5S. 1797. 



Dryocampa vIrginiot.nK'WisaTwooit, Edit. Dnii-y, 111,, II, \i. 24, Tali. XIII, tig. 2. 1S37. 



Dryocamj/n peUucida Harri.s, Kep. Inj. Iii.>^. Mass., p. 293. 1S41. — Frrrii, Fifth Kep. Xox. Ins. New York, 



p. 44. 1859. 

 DryocamjM virijinlenxWW AhKmi, Cat. Leji. lift. Brit. Mus., \'l, p. 1490. 1855. 

 Dryocampa peUucida M.ov.m.%, Syn. Lep. N. Ainer., 11. 232. lS(i2. 



