271 



spots on each side, below which is a lateral series of small white spots; a 

 transverse white spot on tlie tail, and two white spots on the hind part of 

 the first segment. The tubercles produce very short bristles. 

 , The imago was observed May 29, 1821, June 1, 1835, June 15, 1828 and 

 1829, June 25, 1820, July 21, 1825, July 24, 1825, July 25, 1825, Aug. 2, 

 1825, Aug. 1, 1838 and 1839, Aug. 10, 1837, Aug. 15, 1835, Sept. 1, 183!). 



Papilio Tx'oilus Linn. [PI. ii, fig. l, and PI. iv, fig. 16.] 

 Aug. 31, 1822. Larva feeds on the leaves of sassafras. When small it 

 is of a blackish color, with a white line on the side. Several larvae of dif- 

 ferent sizes and ages were kept to observe their changes, 



1. Small blackish larvjB. [PI. iv, fig. 16.] Sept. 3, 1822, some of them 

 changed their skins and became green. Sept. 12, one of these green ones 

 changed its skin, and became yellowish. Sept. 13, this one was suspended 

 at night. Sept. 14, became a chrysalis early in the morning. June 7, 

 1823, imago. 



2. Sept. 14 (all my small, dark caterpillars had become green), green 

 larva became yellow. Sept. 15, yellow larva suspended. Sept. 16, became 

 a chrysalis of a green color in the middle of the forenoon. June 20, 1823, 

 imago. 



3. Sept. 15, a green caterpillar became yellow. Sept. 16, suspended. 

 Sept. 17, chrysahs of a brown color. June 16, 1823, imago. 



4. Sept. 16, a green larva became yellow this morning. Sept. 17, sus- 

 pended. Sept. 20, chrysalis of a brown color. June 18, 1823, imago. 



