146 THE REPORT OF THE No'. 19 



On 22nd July they began passing first moult, the length after the moult 

 being 4.7 mm. 



As I was leaving town early in the morning of Saturday, the 23rd to 

 spend Sunday at Lake Memphremagog, I merely took the length expecting 

 to be able to take the rest of the description on my return, but on the 26th 

 recorded in my note book that the second moult had already been passed 

 and made the following description : 



Stage III., after second moult. Length 8.6 mm. Head, rather small, 

 rounded above, yellow, the ocelli, brown. 



Body, rather plump, greenish yellow, with a green dorsal stripe, more 

 conspicuous on the abdominal segments. Hairs spreading, a few longer than 

 the others on some of the anterior and posterior segments, yellowish. The 

 lateral warts seem to be placed in depressions. Feet and claspers, yellowish. 



These larvae matured very rapidly and on 28th the third moult wa» 

 being passed. 



Stage IV., after third moult. Length before feeding about the same 

 as when last taken. 



Head, yellow, mouth parts brownish. Body greenish yellow, the pul- 

 sating vessicle showing as a green line. Hairs, long and silky, overhang- 

 ing the head and anal extremity, light yellowish. Anal claspers, rather 

 small and spreading. Feet and claspers, pale yellowish. 



The caterT)illar under observation which had just passed the moult stood 

 on its central abdominal claspers and raised both extremities, back to back, 

 brushing them together to adjust the hairs. This it did repeatedly and 

 with so much energy that it lost its hold and fell off the leaf. 



On 31st July all but two had passed the fourth moult. 



Stage v., after fourth moult. Length, 12.5 to 14 mm. Head, yellow, 

 with tinge of orange, ocelli dark brown or black. Except when feeding or 

 in motion the head is concealed by the hairs of the second and third seg- 

 ments which overhang it. Body, pale greenish, the spreading hairs greenish 

 yellow. There are a number of long hairs on the segment projecting for- 

 ward over the head, and a few on the third and fourth segments which stand 

 straight up or project slightly forward. These hairs are from three to four 

 times as long as the other hairs. There are also a number of similar long- 

 hairs on the 11th, 12th and 13th segments which slope towards the rear. 



While I was describing these, at least about a half of them roused them- 

 selves and began running about, especially around the rim of the jar, stop- 

 ping every few seconds and sounding with their feet, raising the thoracic 

 segments and striking a number of times and then going on again. They 

 sometimes crawled part way down the outside of the jar, but generally 

 crawled up again, not showing any disposition to go far from home. Two, 

 however, crawled down to the table, but one of these crawled upon the tin 

 cover of the jar and rested there. 



On 1st August two were found to have passed the fifth moult, but no 

 change in size was apparent. 



As I was leaving that evening for a brief trip to Tadousac on the lower 

 St. Lawrence I had no time to make any detailed description of Stage YI. 



On 5th August the larvse were passing the sixth and last moult and 

 changing their appearance considerably, but also showing a good deal of 

 variation. Some were mouse-gray all but the head which was still honey- 

 yellow, while others were gray as to the skin, but with yellowish hairs and 

 some had yellowish hairs with a few mouse-gray ones mixed in. 



These larvae were perfectly healthy up to the time of my leaving 

 Tadousac for home on the evening of 7th August. They had been perfectly 



