120 MEMOIRS OF illE NATIONAL ACADEMY OF SCIENCFX 



iuid all within iiiako a lilar patch. X siiiolc discal spot, paler at the eeiiter; the extradiscal 

 line pas.ses very near it: it is closely wrinkled or zigzag. The outer edge of the wing is clear in 

 all the specinien.s. 



rnd(M' side of the wings all yellow; (dearer than above, and either no lin(>s nv only faint 

 traces (if the extradiscal on the fore W'ings: the oth(>r lieing reduced and small. A triangular 

 lilac patch on the margin. 



'I'hcrt' is a great disparity in size, though not in markings Ijetween the two sexes, and in 

 markings it presents considerable variation. In size the Mexican female, reared in Providence, 

 H. I., from a pupa which I collected at Cordova. Mexico, in the "Tierra Caliente," exceeded 

 any Tnited States specimen seen by me. 



Expanse of the fore wings, (? 90-110 mm.; 9 1.5.') mm. Length of a single fore wing, 

 <J ■iO-i'y2 mm.; 9 75 mm. Breadth of a single fore wing. <? 21-30 mm.; 9 38 mm. Length of 

 a hind wing. 3 2.S-35 nun.: 9 50 mm. Breadth of a hind wing, S 22-27 nmi.; 9 38 mm. 



The eggs were received from Mr. James Angus, and the larvte hatched from them reared 

 in Maine, so that their development, owing to the cooler climate. )nay have been less rapid than 

 .in Ni'w York, where the eggs were laid. 



J'-.';/(/. — Length. 3 mm.; breadth, 2.Hnnn.; thickness, 2 mm. F'lattcned elliptical, eat-h end 

 alike, white, with an equatorial, smooth, distinct ridge. The shell is whit(>. the surface under a 

 high-power triplet is seen to be finel_v pitted, the pits being shallow and not closely crowded. 

 Under a half-inch objective the pits are seen to be shallow, and not often with a definite raised 

 edge; often there is a boss or bead in the center. Arising from the spaces between the bosses 

 are slender, short, very minute hairs, originating from a swollen l)ase. Under a one-tifth objec- 

 tive, as well as a one-half and a triplet, 1 can not distinguisli between the microscopic structure 

 and markings of the eggs of /nij/i-r/'alts- and regali-s. 



The fn'shly Jiatchecl lamv. — Some were seen drawing themselves out of the shell June 3(i at 

 noon. Length in a few miiuites after hatching, 7-8 mm.; width of head, l.."> nnn. The tuljenles 

 and spines become erect before the larva entirely deserts the shell. 



The head is large and full, smooth, shining, nearly twice as wide as the body behind the 

 middle, ])ut the prothoracic segment is much wider than the body; the i^rothoracic segment is 

 above of the same color as, and the sui-face shines like the head. The l)ody is pale chestnut, witli 

 a slight pinkish tint. All the spines are, before it entirely leaves the (^gg. shining jet-l>lack; the 

 five longest ones (four thoracic and oiu' median abdominal) bearing white hairs, the end hairs on 

 all the shorter ones ])eing black." The thoracic segments are without transverse dark stripes, 

 but on each of abdominal segments 1-7 there are three transverse, distinct, con.spicuous, l)lack 

 dorsal stripes; the first on(> in the front of the spines is broken, and wanting on the tirst abdom- 

 inal segment, t)ut the two behind are unbroken and extend a little below the position of the spir- 

 acles. The spiracles are hard to detect, as they are situated on an oblong or fourth transverse 

 black band between the two lateral spiracles. The eighth and last two segments are not banded. 

 The lai'ge anal legs are edged w ith black behind. The thoracic legs are black. 



There are four spines on each side of the prothoracic .segment, all of very unecjual length; the 

 lowest one minute and bifid: \\w one in front of the spiracle stumpy and ending in five slender, 

 papilliform, i)ilif(r(ius tubercles. The subdorsal one is much longer and forked, while the two 

 dorsal ones arc very long and slender, about as long as the head is broad and deeply forked, each 

 foi'k beai'ing a bristle. The two dorsal tuherchs on the second and third thoracic segments are 



« " I am always amazed at tlie iliffcrence in fxperienoes. This morning I watched a set of E. iinj/erialix hatch, and 

 in every instance the setie of tlie tnlKTclcs were white for several minutes after the larva had left the ej;g, except 

 those of the four tuheri-les over the head, which were hiack before hatching, and could be seen through the shell clearly. 



"The rapid growth of the long "horns," after leaving the shell, was most intere.«ting. In live minutes they were 

 of normal size, but half an hour was needed to give them the shining black color; in some cases longer. 



"After watching them I looked up this point in your pampldet on Cfndurampldae, and saw how your experience 

 differed. Then I went back to my remaining eggs and watched the process from the moment the egg was broken, 

 hoping to lind some agreeing with yours, but none would. I had a l.'vdiameter magnifier, and could see clearly." — 

 Miss Caroline G. Soule in a letter. 



