THE BKOWN-TAIL MOTH. 43 



vary in length, but none of them are longer than the width 

 of the head. The body is dull yellow, but this is obscured 

 by the color of the tubercles, which are much darker than 

 the ground color of the body, some of them being black. 

 The tubercles are arranged as in the mature larva, and are 

 armed witli barbed spines like those on the head, except the 

 subdorsal row, which has smooth, sharp-pointed spines, dark 

 at the tip, lighter at the base, and about as long as half the 

 diameter of the body. The length of this stage is from four 

 to six daiys. 



The larva after the first molt is about one-fifth of an inch 

 long, with a shining black head, clothed with scattering pale 

 brownish-yellow hairs, as in the preceding stage. The 

 ground color of the body is dull yellowish, and the dark 

 color of the tubercles is so pronounced as to give a darker 

 appearance than in the preceding stage. The smooth, sharp- 

 pointed spines of the subdorsal row of tubercles are no longer 

 present, but are replaced by the ordinary barbed spines ; and 

 the subdorsal tubercles of the 5th and Gth segments are cov- 

 ered with a short, dense tuft of chestnut-colored feathery hair. 



The larva after the second molt changes but little before 

 hibernation, except in size. The head is black, and clothed 

 with barbed brownish-yellow hairs. The body is dark 

 brown, with two parallel longitudinal reddish-yellow lines 

 between the subdorsal tubercles, extending from the head 

 to the 10th segment, broken between the segments and also 

 on the 5th and (jth segments by the tufts of hair, which are 

 similar to those in the preceding stage. The coral-red 

 retractile tubercles on the top of the 10th and 11th seg- 

 ments appear after the first molt, and are present in all the 

 remaining larval stages, though at first they are of a light- 

 yellow color. 



The larva3 stop feeding and go into hibernation in their 

 winter webs (Plate 14) early in September, some having 

 molted once, others twice and a few three times. 



Emergence in the Spring. 

 The larvae generally emerge from the hibernating tents 

 from the 18th of ^larch to the 20th of Ajiril, though the 

 time varies somewhat, according to whether the season is 



