MEMOIKS OF TilE NATIONAL ACADEMY OF SCIENCES. HI 



Egg. — Laid in inegiilar i)atclies of about 75 on the umlerside of a leaf; oval eylindrieal, 

 larger at the lower end by whieli they are attached, bulging out a little above the base, and 

 contracting toward the top, which is somewhat erater-like: tlie inicropyle dark, distinct, aud 

 situated at the bottom of a saucer like depression ; outside aud below tlu^ rim of this crater is 

 usually (not always) an irregular crenulated edge or rim, wliich is partly eaten away by the larva 

 in escaping from the egg. The shell is smootli, jiolished, not pitted when examined by a strong 

 lens, nulkwliite, and resembling cheap white earthenware pottery. I'ndcr a i 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 tlian in the egg of J). jmJihU. Diameter 

 about two-thirds nun., being considerably less than the height. 



Larra. — The S])ecimens 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-parts. Tlie prothoracic shield is distinct, transversely 

 oblong, black. Body bhick, with four luirrow, pale whitish yellow stripes on each side. The two 

 dorsal stripes are wide apart, leaving a broad dorsal median black strijje; the space between the 

 first and second line 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 puri)Iish 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 grayisli in color. The body beneath is black, with a median livid 

 pinkish line along the abdominal segments, widening between the abdominal legs, and ending on 

 the seventh segment, the end of tiie body, including the anal legs, being black. 



Tlie following account of its transformations is copied from Beutenmiiller: 



E(j(/. — Simihir to that of D. ministra; can not be (listiuj;iiislK'il from it. Laid in masses on tho nudersiili' of leaf. 



Young larea after first iinil second molts. — Can not be distiusnished from those of D. ministra. 



After third molt. — Little chunjje except in size. The stripes are now continent abont the anal segments. 

 Length, 30 nim. 



After fourth molt. — Head jet-black, cervical shield now chcstunt brown instead of black; otherwise Jis m 

 D. ministra. Length, 40 mm. 



Mature larra. — Head jet-black, shining, slightly pnuitnred; cervical shield aud neck wholly golden-yellow. 

 Body black, with four eijuidistant stripes of citron-yellow on each side aud three on the niulerside. Abdominal 

 legs aud bases of thoracic feet orange. The stripes all become conjoined at the posterior extremity. The anal plate 

 iet-black, very shiny and nearly smooth, and not roughly punctured, as in I), ministra. The hairs over the body are 

 sordid white. Length, .")0 mm. tSiugle brooded. 



]\Ir. Beutenmiiller writes me that ''the young larva of I>. (iiigiisii is different in coloration 

 from all the other known Species. The first and third thoracic segments are wine colored, as are 

 also the dorsal region of the fourth, fifth, aud .seventh abdominal segments, and the body is 

 greenisli brown, provided witli the usual number of yellow longitudinal stripes." 



HahiU. — At Salem, INIass., I found (August !.'(!) 14 full-grown larvie and 40 others in the fourth 

 stage; early m the morning of August L'S these had molted aud begun to feed. Larva in July and 

 August; moths Aj)ril to July, District of Columbia and Maryland (Eiley). 



Pupa. — Body rather stout, surface very coarsely punctured, the pits more or less confiuent, 

 especially on the thorax; head prominent, deeply notched at the end, and with two prondueut 

 l)arallel ridges in front, with a deep valley between. The four terminal spines of the cremaster 

 ecpral in length and shape. On each side of the common ba.se is a conical projection. Length, 

 15 mm (Figs. 56, 57). 



Fooil plditt.s. — Hickory (Carija) and walnut [Jnglans] Beutenmiiller: linden (I'ackard). In 

 ^lauhattan, Ivans., Betula (I'openoe), black walnut and hickory (Kiley). 



Gcograplucal distribution. — Brooklinc, Mass. (Shurtlefif Mus. Bost. Soc. Nat. Hist.); Jamaica 

 Plain, 3Iass. (Jack, Mus. Comp. Zool.); Beverly, Mass. (Burgess, Bost. Soc. Nat. Hist.); 

 IMattsburg, N. Y. (Hudson); Chicago, 111. (Bolter); Illinois, Pennsylvania (Strecker); Auburn, 

 Me. (Mrs. Feruald); Salem, Mass. (Packard); West Farms, N. T. (Angus); Missouri aud District 

 of Columbia (U. S. Nat. Mus.); New York, New Jersey, Penn.sylvaiua. Arkansas (Palm): Ames, 

 Iowa (II. Osborn); Canada, Ehode Island, New York, Wisconsin, West Virginia, Indiana, 

 Carbondale. 111. (French), 



