186 Fiftieth Report ox the State Museum 



incisures characteristic of the adult form. On the 6th a larva took 

 position for its molt, on the 7th two others, and ten on the 8th. At this 

 time they measure 0.9 inch in length. 



November 8th. Fifth molt commenced — one larva molted; ten more 

 were found to have molted on the morning of the loth; the last molted 

 on the 15th — the molting of this stage extending over seven days. At 

 the end of this stage they average in length 1.6 in. at rest and 2 in. when 

 in motion. All the spines are black, except some lateral ones in a few 

 individuals, which are brownish ; they are minutely barbed to the naked 

 eye and distinctly so under a magnifier (PI. iv, fig. i). The segments are 

 black dorsally, except the thoracic and the last two which are a reddish- 

 brown, as are the sides below the spiracles. The red incisural bands 

 commence behind the 4th segment and continue until after the loth, 

 being seven in number; the central ones being about one-third as long 

 as the black portion of the segment. 



November 17. Sixth molt commenced — all the larvte remaining upon 

 the leaves. The molting terminated on the 23d — continuing six days. 

 In every instance in this molt, the head-case remained attached to the 

 skin. The exuvia shows distinctly a central lateral patch of dusky scales. 

 Fewer of the exuviae were eaten (26 per cent only), owing doubtless to 

 the stronger and more rigid spines. All the spines are black and all the 

 segments are black dorsally.* 



November 25. Seventh molt commenced — terminated on December 

 4th, — continuing nine days. Length 2.4 inches, at rest; when extended 

 in feeding, 3 inches. 



December i. A caterpillar commenced spinning its cocoon on the 

 side of its feeding cage and the glass cover; for convenience it was trans- 

 ferred to another box. On the 3d inst. a second one had commenced. 



December 13. The first pupa was observed, from the caterpillar that 

 had commenced to spin up December ist. Two more molted on Decem- 

 ber 14th. On the 30th, tlie last larva was transferred to a box for 

 pupation. 



* If the preceding notes are compared with Dr. Dyar's descriptioa of the early stages of ihis 

 insect (see Canadian Entomologist, xxiii, 1S9I, pp. 106-107), some differences will be detected. 

 Most of these can undoubtedly be accounted for by the natural variationsof thespecies under 

 differing conditions. 



