MEMOIRS OF rilK NATIONAL ACADlvMY OF SClENCEvS. 115 



show a teiuloiu'v to rothiction. hoiiio- murli sliortor espocially lliiis(> on ulxloiiiiiial sognient.s S aiul 9. 

 The saino tendiMicv to atrophy is soon in tiio arniatur«' of llio suranai plate, whidi has siiialloi, 

 less iiiunorous spines on the upper surlace. thoiij;ii tiie lateral spines are no smaller and are 

 more pigiiiontod. The anal leys are nearly the same in all the species. 



I*„2,a. — The characters are identical with those of the other species; indeed there soom to 

 bo no distinctly marked specific characters in the pupa- of this (r(>nus. either in the shape of the 

 body, the cremaster. or the armatiue. Length. S . "24 nnn. 



Food plant. — Maples of ditlercnt species, especially the swamp or rod maple; in rare cases 

 the oak. 



ILiJf'dx. — This species is usually northward much less gregarious than any of the others, living 

 after the first molt singly on the leaves of its food tree. 



.\lthough in the Eastern States this insect, especially the moth, is not common, yet we have 

 observed it as far east as Brunswick, Mo., where it feeds on the maple, the moth there appearing 

 the middle of June; in the A\^estern States, Illinois, Missouri, and Kansas, it proves during 

 certain years very destructive, entirely or nearly stripping the soft or swamp, and sometimes the 

 silver, maple of its leaves, and discouraging people from planting this tree along i-oadsides. It 

 is known to feed on the oak. In Missouri and Kansas the worm is double-l)rooded, the tirst 

 brood of larvre appearing mostly during June and giving forth the moths late in July, while the 

 second brood of worms appears in August and September, wintering in the chrysalis state, and 

 not appearing as moths until the following ;\Iay. The cateri)illar molts four times, becoming 

 fully fed within a month, and then entering the ground to pupate. 



Parasites.— K Tachina parasite, Tachlna {Belvosla) hifasdata Fal)r.. and an ichneumon fly 

 pre}' upon the caterpillars, and thus reduce their numbers. (Riley.) 



Gt'ograpliiait runij,'. — Franconia, N. H. (Mrs. Slosson); Brunswick, Mo. (Packard); New 

 York City (Joutel); Plattsburg, N. Y. (Hudson); Pennsylvania (Strecker); New Jersey, "common 

 throughout the State, sometimes quite injurious to the maple " (Smith); Colund)us, Ohio (Tallant); 

 Missouri, Franklin County; Independence, Ivans. (Riley). (See Map VI.) 



In 1890 it stripped to some extent the foliage of maples at Roxie, Miss. (G. H. Kent). 



This species extends farther north than any of the others. Mr. W. Mcintosh writes me 

 that it is rare about St. John, New Brunswick, but common at Amherst, Nova Scotia, and also at 

 McAdam Station and Brown^•ille Junction, Me. It is more common in Kansas than any of the 

 other species. 



PI. XIX, figs. 7, 7a. 



Anisota gupremaH. Edw., Papilio, IV, p. 16, Jan., 1884.— Schaus, Papili.., IV, p. 102, :\Iay, 1SS4. Larva.— 

 Drcce, Biologia Centr. Aimer., Lep. Het. II, p. 415, Sept., 1897. 



lAirva. 

 Sch.ms, II'., Papilio, IV, p. 102, May, 1884. 



hnago. — 1 c? , 1 9 . Antennte pectinated as in ^4. hicolor. Thorax clothed with velvety dark 

 bav, chestnut brown scales; abdomen black, at the tip reddish chestnut. Fore wings uniformly- 

 dark bay or chestnut brown; a l)asal line which is narrow, faint, more pronounced on the veins; 

 an extradiscal line situated as usual, heavier than the basal and black brown. Discal spot quite 

 large, round, more oval in the ? than in S . 



Hind winos of S distinctly triangular, much more so than in ,1. l/icuhir or heU Hjhrodtli and 

 A. stigma; it is intermediate in this respect between these forms and the $ of ^4. senatoria and 

 ^4. virgiriiensis; the S is more aberrant, both in the shape of the wings and the coloration, the 

 hind wings being reddish-pink, the veins blackish, the single transverse line broad and diffuse, 

 blackish; in the 9 the hind wings are black, while the 9 fore wings are much paler than in S , 

 with the V)asal line obsolete. 



Abdomen dark brown, with ochorous rings, and the tip dull ocherous. Under side of the 

 fore wings darker on the outer and inner edges, while the hind wings are black. In 9 both 

 wings are like the hind wings above; discal spot very faint. 



