MEMOIRS UK rill': NATIONAL ACADE.MV OF SC1ENCP:S. 115 



show a tendency to reduction. beiii<;- nuicli shorter especially those on ahdoininal segments s and i). 

 The same tendency to atrophy is seen in the armature of the suranal i)latc. which has smaller, 

 less numerous spines on the upper surface, thoujih the lateral spines are no smaller and are 

 moi'e pigmented. The anal legs are nearh' tlie same in all the species. 



Papa. — The characters are identical with those of the other species; indeed there seem to 

 be no distinctly marked specific characters in the pup£e of this gciuis. either in the shape of the 

 body, the cremaster, or the armature. Length, i , 2-4 nun. 



Food plant. — Maples of ditJ'erent species, especially the swamp or red maple; in rare cases 

 the oak. 



Ilahits. — 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. 



Although in the Eastern States this insect, especially the moth, is not common, ^^et we have 

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

 the middle of June: in the Western States. Illinois. Missouri, and Kansas, it proves during 

 certain years ver^- destructive, entirely or nearly stripping the soft or swamp, and sometimes the 

 silver, maple of its leaves, and discouraging people from jjlanting this tree along roadsides. It 

 is known to feed on the oak. In Missouri and Kansas the worm is double-brooded, the first 

 brood of larvie 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 ^Ma}'. The caterpillar molts foui- times, becoming 

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



Pcrnxs'ttes. — A Tachina parasite, Taehina {BeJrosiii) hifandafd Fabr., and an ichneumon fly 

 prey upon the caterpillars, and thus reduce their numbers. (Rilt\v.) 



Gt'ographlcal range. — Franconia, N. H. (Mrs. Slosson); Brunswick, Me. (Packard); New 

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

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

 Missouri, Franklin County; Independence, Kans. (Kiley). (See ^Nlap \'I.) 



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



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

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

 McAdam Station and Brownville Junction, Me. It is more common in Kansas than anj' of the 

 other species. 



PI. XIX, tifjs. 7, 7a. 



Anisotd .mprcmii H. Edw., I'iijiilici, IV, p. Ui, Jan., 1884. — Schacs, I'aiiilio, IV, p. 102, May, 1884. Larva. — 

 Dkcce, Biologia Centr. Aiiier., Lcp. Ilet. II, ]). 41.'>, Sept., 1897. 



Larra. 

 ,SW(.i".-', ir., Fapilio, IV, p. 102, May, 1884. 



Imayo. — 1 ^,19. Antennse pectinated as in ^-1. hlcolor. Thorax clothed with velvety dark 

 ba}% chestnut brown scales; abdomen black, at the tip reddish chestiuit. Fore wings uniformly 

 dark bay or chestnut brown; a basal 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, niore oval in the 9 than i;i <? . 



Hind wings of S distinctly triangular, much more so than in .1. Iiicular or iK/ilH/hrodtii. and 

 A. stigma; it is intermediate in this respect between these forms and the S of A. senatorla and 

 A. mrginieiisis; the S is more aberrant, both in the shape of the wings and the coloration, the 

 hind wings being reddish-pink, the veins l)lackish, the single transverse line broad and difl'u.se, 

 blackish; in the 9 the hind wings are black, while the 9 fore wings are much \m\n- than in S , 

 with the basal line obsolete. 



Abdomen dark brown, with ocherous rings, and the tip dull ochcrous. Fnder sidt^ of the 

 fore wings darker on the outer and imier edges, whih^ the hind wings are l)lack. In 9 l)oth 

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



