273 



Papilio Philenor Drury. 



These caterpillars were only a few days old (probably not more than two 

 days), and were just changing their skins for the first time. The remains 

 of the ego-s Avei-e seen fixed to the petiole of the leaf, and the caterpillars 

 had only eaten a part of the leaf, beneath which they lived. The small 

 ones were dark brown, without spots, the head and feet black, and dif- 

 fered from the others only in having shorter tubercular projections. Those 

 which had changed their first skins were deep chestnut brown and shining, 

 with the dorsal tubercles on the sixth, seventh, eighth and ninth segments of 

 an orange color, the two tubercles on the first segment rather longer than 

 those on the other segments, but not very much longer than the lateral 

 tubercles on the second, third and fifth segments, the tubercles on the last 

 three segments of the body rather longer than those preceding them, and 

 as well as the other elongated tubercles somewhat pointed, while all the short 

 tubercles were obtuse and wart-like. 



Between the 5th of August,' and the 23d of the same month, these cater- 

 pillars twice changed their skins, and underwent considerable changes in 

 the color and proportions of the tubercles. After the first moulting the 

 tubercles of the posterior part of the body, and the lateral tubercles on the 

 second, third and fifth segments became proportionally longer than at first, 

 and the two tubercles on the first segment were still longer, and projected 

 laterally and anteriorly, like horns; a distinct orange colored spot was visi- 

 ble between them, marking the orifice of the forked osmaterium, which, 

 however, did not seem to be capable of being thrust forth. In a fcAV days 

 more, however, on very rough handling, the caterpillars showed their scent 

 organs a little. This took place at the age of about a week, and then the 

 dorsal tubercles on all the segments began to be very slightly tinged with 

 orange at the base, more distinctly before than behind. 



On the 23d of August, the largest caterpillars measured, when at rest, an 

 inch and seven eighths in length; all the dorsal tubercles were orange 

 colored, but those of the tenth, eleventh and twelfth segments were black 

 at the tips; the short lateral tubercles of the fourth segment were also orange 

 colored. Abbot's figure (Insects of Georgia, Tab. iii) may be considered 

 as quite correctly rejiresenting the caterpillar at this age, except that the 

 last pair of dorsal tubercles should have been curved backwards and later- 

 ally; the tubercles also are not colored of a deep orange, as in nature, and 

 the yellowish, or orange colored, transverse spot on the first segment should 

 have been placed close to the head, and between the horns instead of be- 

 hind the latter. 



The insect at this age (probably about twenty days old) may be thus de- 

 scribed: — Caterpillar deep chestnut brown, smooth and shining, in some 

 lights changing to velvety black; with a single pair of long, slender and 



OCCAS. PAPERS B. S. N. H. — I. 18 



