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LIBYTHEA. 



Egg. Color pale green ; in shape an oblate spheroid, somewhat pointed at 



base and a little truncated and depressed at summit ; marked by many horizontal 

 corrugations, and longitudinally by eighteen to twenty narrow, prominent ribs 

 which proceed from base and terminate, some of them irregularly, at about four- 

 fifths the distance to sunmiit, while eight, increasing gradually in prominence, 

 terminate abruptly at the rim of the summit, whicli is flattened as in Grapta ; 

 these long ribs cut on either side, as in Grapta, by grooves perpendicular to the 

 surface of the egg; they are also frequently deflected somewhat from a direct 

 line. (Fig. o.) 



Another egg, within one day of the appearance of the larva, differed from the 

 above ; the length being sensibly increased by the flattening of the corrugations, 

 and, at the same time, the transverse diameter enlarged from the unfolding of 

 the ribs, which had become scarcely more than lines upon the surfice. (Fig. h.) 



The LarviB emerge from the egg in four days ; in length .06 inch ; greenish- 

 brown, translucent, covered with flue hairs. Of the first moult I am unable to 

 speak, but after passing the second, in tour to five days from the egg, they are 

 .25 inch in length, slender, cylindrical, entirely one shade of dull green, .some- 

 what pilose, each segment transversely creased ; two days later the third moult 

 takes place ; length .6 inch ; head pale green ; body velvety-green, with a pale 

 dorsal line and a taint, whitish, lateral stripe from second to last -segment ; each 

 segment creased and marked by rows of whitish, tuberculated points ; under side 

 and legs pale green. 



The Mature Larva is one inch long ; head bi-lobed, pale green ; body dark 

 velvetj^-green ; the dorsal line distinct, yellow ; the lateral stripe yellow, as are 

 also the tuberculated points ; on the side of third segment is a black point ; 

 under side and legs pale green. 



Another larva, after third moult, was marked as follows: the dorsum dark 

 green, edged on either side by a gray line, and successively by a band of yellow, 

 another gray line, and a black band to the legs ; the third segment wholly black, 

 and fifth partially ; the entire upper surfoee finely tuberculated with yellow ; 

 pro-legs black ; legs pale green. The markings were similar after fourth moult. 



Two other larvae were green, with a lateral black band above the feet, and a 

 few black patches on third and eleventh segments. 



Chrysalis. — Length .5 inch; sub-triangular, compressed laterally; head case 

 square ; mesonotal process rounded, prominent; color blue-green ; a faint yellow 

 dorsal line passes from last segment to middle of body, where it forks, sending a 

 branch along each wing cover to the top of head case and meeting ; there is also 

 a lateral yellow line from end of last segment to edge of wing cover ; the ab- 

 dominal segments marked by many whitish tubercles. Time from laying of egg 

 to appearance of the imago sixteen to seventeen days. 



