LAR YM OF BUTTERFLIES. 
By Miss Nettie Middleton . 
PAPILIONIDiE. 
This family is represented in Illinois only by the genus Papilio , 
which contains the Swallow-tailed Butterflies. The Caterpillars are 
cylindrical, provided with sixteen legs, and smooth or more or less 
roughened with small tubercles, but never villose nor hairy. The 
first segment behind the head is furnished with two retractile 
tentacles or scent organs, joined so as to form a fork, which are 
usually drawn in, but which the insect throws out when alarmed, 
emitting at the same time a disagreeable odor. They are usually 
solitary* in their habits, feeding on the leaves of plants, and are of 
medium or above medium size. 
Papilio philenor, Dru. The Philenor Butterfly. 
Caterpillars, when 
fully grown, are about 
two inches long, vel¬ 
vety-black, with pur¬ 
plish or brownish tint, 
covered with long tu¬ 
bercles of same color 
and shorter orange 
tubercles, as follows: 
Two long antennae¬ 
like dark ones on the 
first segment; segments 2, 3, 5, 6, 7, 8 and 9 each with two dark lateral 
and two orange dorsal tubercles, the dark or brown ones longest; 
Fig. 6. Papilio philenor. Larva. 
*Note. —This is intended to apply only to Illinois species, as the larvae of some Papilios, 
at least of South America, are gregarious. 
