MEMOIRS OF THE NATIONAL ACADEMY OF SCIEXCES. 151 



Habits.— The inotli was collected at Kitterj-, Me., July 18, by :\rr. E. Tliaxter. and at :\lan- 

 'CLester, Vt., August 3, by Mr. C. H. Eobei'ts (as by labels iu IT. S. Nat. Mas.. Wasliin.utoii). 

 Pupa iu August; motli, May, June, and August (Eiley MS.). 



"The species is doubled-brooded at I'lattsbnrg, N. Y., siugle-brooded iu flic Adirondacks, 

 thungli a single 3 emerged the same season " (Dyar). 



Food i)Iants. — Betula (Thaxter, Can. Eiit., xxiii, p. 34, Feb., 1S91) ; Betida pnjnirifcra (Dyar). 



Geo!/r<q)h!cal <1isfiU>ution. — Thus far only known to inhabit the Appalachian subprovince. 

 The following localities are the only ones yet known to mo: Orono, jMe. (Mrs. Fernald); Kittery, 

 Me. (Thaxter); Vermont, New York (U. S. Nat. Mas.); New Hampshire (C. A.Walker): Oatskill, 

 N. Y. (Mus. Comp. Zool.); Plattsburg, N. Y., Keens Valley, Essex Co., N. Y., (Dyar); Boston, 

 Mass. (Sanborn); ^lanchester, Vt. (Eoberts, U. S. Nat. Mas.); Maine, Canada, New York, North 

 Carolina (French); Plattsburg, N. Y. (Hudson); Fort Collins, Colo., June 21, at light (C. H. Baker). 



Ufig. — Flattened hemispherical: shell nnder a hand lens appears Jilmost smooth, but under 

 a A-inch A eyepiece seen to be ornamented with six-sided areas, witli raised, beaded edges. 

 Diameter, 0.7 mm. 



Larva, Staf/c I. — Just hatched. Length, 3 mm. Head large, much wider than the body, black- 

 "brown, smooth, polished, with a few scattered long slender hairs. Body nnilurmly pale yellowish 

 green, tapering to the end, the segments transversely wrinkled, hairs long and dark, slender and 

 tapering. A faint darker dusty greenish prothoracic subcrescentiform j)late. Body with no 

 markings; no lines or spots. 



Providence, June l!t. Eggs kindly given me by Mr. W. Dearden. All the eggs hatched at 

 nearly the same time and on the same day. 



The larva eats a hole out of one side, of the nsual irregular kidney shape. 



Pupa, August; adults, May, July, and August: localities. New York, Vermont, and District 

 of Columbia. 



Pupa. — About 19 mm. long, robust, tip truncate, very slightly tapering; a very slight and 

 blunt projection at tip scarcely noticeable; general surface shiny, somewhat rugose, and remotelj' 

 punctate. No processes or teeth at sutnres between meso and metathorax. 



^^E(jg\ — Laid singly, usually ou the upper side, near the middle of the leaf of its food plant 

 [Betida papyrlfera). Rounded, somewhat Hatteued, about the shape of two-thirds of a s])here 

 with Hat base; diameter, 1 mm.; height, 0.<! mm. Slightly shining, fine turrpioise-blue or more 

 rarely of a greenish blue tint. Microscopic reticulations neatly defined, but rounded, scarcely 

 angular, becoming small and indistinct at the micropylar region. On the sides the reticulating 

 edges of the cells become broad, flat, almost like bands, leducing the inclosed depressions to 

 shallow pits. Found during the early part of July at Keene Valley, Essex County, N. Y. 



''First hirral staf/e. — On hatching the larva leaves the shell largely intact and takes up a 

 position at the extreme apex of the leaf, where it eats the upper epidermis and parenchyma. 

 Head cordate, entirely shining black; width, (>.(i mm. Bodj'rather bright greenish yellow, thoracic 

 feet black, cervical shield transverse, dusky. Setre fine, short, black, distinct, but without evident 

 tubercles; not glandular; 1 and 2 nearly in line, 3 above spiracle, 4 substigmatal posteriorly, .5 

 snbventral anteriorly, absent as usual in the first stage. Feet all used; leg plates concolorous 

 with the body. No anal plate. Length, about 3 mm. 



'•Second star/c. — The larva eats away the substance from the midrib of the leaf at the apex, 

 using the midrib as a perch on which it rests. Head slightly bilolxnl, greenish; a smoky black 

 shade covers the side, including the ocelli, and a narrow smoky band reaches the apex in front of 

 the lateral angle; mouth brown; a few seta^; width, about 1 mm. Body cyhndrical, smooth, feet 

 normal, all used. Thoracic feet and leg plates black, except the anal i>air. Setx short and fine, 

 dark, from minute black tubercles, very incons])icn()us; arrangement nornml, six present. Body 

 green, with very faintly indicated addorsal, subdorsal, lateral and superstigmatal waved whitish 

 lines. Spiracles pale. 



•' Third stage. — Head rounded, flat before and held tmt flat: leaf-green; a smoky black band 

 behind ocelli extends backward and upward to the side of tlie head, where it ends tapering; mouth 

 reddish: width, l.(i mm. Bodj^ as before, but the tine dark setie have no tubercles. Color pale 

 leaf- green ; ou joints 2-3 a yellowish line edged above with red extends up from below the spiracles 



' Tlie following notes on the transformations are copied from Dyar. 



