between lepidopteroits larvm and their surrowndings. 359 



From this date to the 29th the larvae were fed upon 

 Balsam Poplar, and then again upon Papulus nigra. 



May 2otk. Most of the larvae were changing the 3rd 

 skin, and all were apparently dark. 



May 2dth. All had changed the 3rd skin except 2, 

 which were changing it. All were dark brown except 

 the 2 latter, which, together with 1 which had just changed, 

 were hght brown. The average length was 14"25 mm. 



Jtcne 27id. Four were changing the 4th skin ; 5 were 

 at various points in the 4th stage, with an average length 

 of 20-75 mm.; 1 was in the 5th stage. All were brown, 

 although not very dark. 



Jicne bth. Four were changing the 5th skin, 33'0 mm. 

 long, and 1 at end of 5th stage. The latter was medium 

 brown, the others 3 light brown and 1 green with light 

 brown markings. The remaining 5 were much smaller, 

 being all in the 4th stage, 3 dark bro\\-n and 2 light brown. 



June 14:fh. Five were nearly mature, 2 green sprinkled 

 with distinct greyish dots much more numerous in the 

 larger larva, which was practically mature and 55-0 mm. 

 long. The ground-colour of this latter larva was bright 

 green, the dorsal tubercles dark grey. Of the other 3 

 large larvae, 1 was very light grey, almost whitish with 

 darker dots and mottling, 2 were much darker, blackish 

 rather than brown, with light gTey markings. The largest 

 of the set of smaller larvae was changing its 5th skin and 

 greenish-brown, 1 smaller in the 5th stage was green with 

 dorsal brown line, 1 smaller still, chocolate brown. Two 

 larva!" were still quite small, viz. 12"25 mm., and probably 

 still in the 4th stage. Both were dark brown, but they 

 appeared to be unhealthy. 



June lotJi. The greenest, the whitish, and 1 dark larva 

 had become mature and were removed. 



June 20tJi. One green larva mature and removed. Two 

 in 6th stage, 1 dark with greyish markings not greatly 

 developed, 1 intermediate, brownish-green ; 1 changing 

 5th skin, cjreen, 2 in 5th stage and lightish brown. 



June 22nd. The dark larva m 6th stage mature and 

 was removed. Two larvae in 6th stage, 1 on gi-een side of 

 intermediate, viz. grreen clouded over but not entirelv 

 obscured by bro^^^l, 1 distinct gxeen with a brown dorsal 

 line and a little brown on the sides. Of the 2 smaller 

 larvae, 1 was in the 5th stage and brownish-green, 1 in 

 the 4th and light brown. 



