MEMOIES OF THE KATIO^TAL ACADEMY OF SCIE^'CES. 
Ill 
Egg . — Laid iu irregular x)atclies of about 75 on the underside of a leaf; oval cylindrical, 
larger at tlie lower end by wliicli they are attached, bulging out a little above the baseband 
contracting toward the top, which is somewhat crater-like; the niicropyle dark, distinct, and 
situated at the bottom of a saucer-like depression; outside and below the rim of this crater is 
usually (not always) an irregular crenulated edge or rim, which is partly eaten away by the larva 
in escaping from the egg. Tlie shell is smooth, polished, not pitted when examined by a strong 
lens, milk-white, and resembling cheap white earthenware x:)ottery. Under a J inch A eyepiece 
the shell is seen to be ornamented with line polygonal areas, but those of the lower part of the egg 
are not distinctly six-sided, being less regular and distinct than in the egg of I). pahnii. Diameter 
about two-thirds mm., being considerably less than the height. 
Larva . — The s])ecimeus here described were received under the above name from Mr. James 
Angus, September 4, I failed to note their length, but they were nearly, if not quite, full-grown. 
Head black, including the mouth-xnirts. The i)rothoracie shield is distinct, transversely 
oblong, black. Bod}' black, with four narrow, pale whitish yellow stripes on each side. The two 
dorsal strii>es are wide apart, leaving a broad dorsal median black stripe; the space between the 
first and second lino is a little wider than between the second and third; the fourth line is 
slightly wider than the others, scalloped, and interrupted by the sutures between the segments. 
Beneath the lateral ridge along the base of the legs is an irregular livid puiqilish stripe beginning 
on the third thoracic segment. There are no hairs along the back, and those along the side are 
unusually short and are pale grayish in color. The body beneath is black, with a median livid 
l>iukish line along the abdominal segments, widening between the abdominal legs, and ending on 
the seventh segment, the end of the body, including the anal legs, being black. 
Tlie following account of its transformations is copied from Beuteniniiller: 
E<j<f . — Similar to that of 1). mumtra; can not ho distiuguislicd ironi it. Laid in masses on the underside of leaf. 
Young Uirca after fmt and second moUs . — Can not he distinguished from those of i>. viinistra. 
Jftcr third mott . — Little change except iu size. The stripes are now coutluent about the anal segments. 
Length, 30 mm. 
Jftcr fourth moll . — Head jet-hlack, cervical shield now chestnut hrown instead of hlack; otherwise as in 
D. minlHira. Length, fO mm. 
Mature larva . — Head jet-hlack, shining, slightly punctured; cervical shield and neck wholly golden-yellow. 
Hody hlack, with four e([iiidistant stripes of citron-yellow on each side and three on the underside. Abdominal 
legs and bases of thoracic feet orange. The stripes all become conjoined at the i)Osterior extremity. The anal plate 
iet-black, very shiny and nearly smooth, and not roughly punctured, as iu D. ministra. The hairs over the body are 
sordid white. Length, 55 mm. Single brooded, 
!Mr. Beuteumiiller writes me that “the young larva of i>. angusii is different iu coloratiou 
from all the other known species, Tiie first and third thoracic segments are wine colored, as are 
also tlie dorsal region of the fourth, fifth, and seventh abdominal segments, and the body is 
greenish bro-wn, pirovided with the usual number of yellow longitudinal stripes.” 
Ifahittt . — Af Salem, IMass., 1 found (August 20) 14 full-grown larvm and 40 others in the fourth 
stage; early lu the luoruing of Augu.st 28 these had molted and begun to feed. Larva iu July aud 
August; moths April to July, District of Columbia and j\taryland (Riley). 
Papa . — Body rather stout, surface very coarsely punctured, the pits more or less confluent, 
especially on the thorax; head proiiiiiieiit, deeply notched at the end, and with two i:)roniinent 
jiarallel ridges iu front, with a deep valley between. Tlie four terminal spines of the cremaster 
equal iu length and shape. On each side of the common base is a conical projection. Length, 
15 mm (Figs. 50, 57). 
Food plants . — Hickory [Carya) aud walnut {Juglans) Beutemn idler; linden (Packard). In 
]\Ianhattan, Ivans., Betula (Popenoe), black walnut and hickory (Riley)/ 
Geographical distrihniion. — Brookline, Mass. (Shurtleff Mus. Bost. Soc. Nat. Hist.); Jamaica 
Plain, Mass. (Jack, -Mus. Comp. Zool.); Beverly, Mass. (Burgess, Bost. Soc. Nat. Hist.); 
Plattsburg, N. Y. (Hudson); Chicago, 111. (Bolter); Illinois, Pennsylvania (Htrecker); Auburn, 
JMe. (Mrs. Fernald); yalem, ]\rass. (Packard); West Farms, N. Y. (Angus); Missouri and District 
of Columbia (U. S. Nat. Mus.); New York, New Jersey, Peiimsylvania, Arkansas (Palm); Ames, 
Iowa (H. Osborn); Canada, Rhode Island, New York, Wisconsin, West Yirginia, Indiana, 
Carbondale, 111. (French). 
