146 MONTANA EXPERIMENT STATION. 



this purpose. Though the larvae had maintained a comparative 

 imiformity of size, the pupation lasted over a month and it was 

 August 1st before the last belated pupa emerged as an adult moth. 



Branches were clipped -from the tree and kept in water under small 

 globe cages where the length of' the stage was carefully recorded 

 irom the first morning after pupation until the emergence of the 

 moth. A number of careful estimates were also made in num- 

 bered localities in the limbs. Of six successfully reared in the 

 cans the length of the stage was as follows: lo, 13, 15, 16, 17 and 18 

 ■clays, giving an average of 14 and five-sixths. Those followed in 

 the tree gave practically the same results. This would seem to 

 be accurate since it was June 25th before there was a general em- 

 ergence of moths. On July 2nd the first eggs appeared in con- 

 siderable numbers. The females did not seem to be as careful 

 ill selecting places for the deposition of the eggs as those of the 

 codling moth, which had also laid in abundance both in and about 

 tl' e cage. Those of the bud moth were laid irregularly over the 

 .ipper and lower surface of the leaves, the latter being considerably 

 in the minority although still quite prominent. The eggs when im- 

 mediately compared with those of the codling moth are seen to be 

 considerably smaller, but under ordinary magnification there seems 

 to be no definate difiference in the markings. Contrary to the pre- 

 ■\ious records in this State the eggs were found to be occasionally 

 laid in clusters of from 3 to 8, sometimes slightly overlapping. This 

 might have been due to the fact that the tree was so badly infested, 

 though it was recorded in more eastern localities as being the or- 

 dinary method of laying. The preference of the moth for the up- 

 per side of the leaves seems to lie in the fact that it is not pubescent 

 and the ei2;g can be better cemented down to prevent the entrance 

 of air. This is apparently an important item since the egg soon 

 dies if the leaf be removed and wrinkles by wilting, or if the edge 

 of the egg be raised ever so slightly. When laid on the under 

 side the eggs are always carefully cemented to the surface beneath 

 the larger hairs of the leaf. Whether this is done by the parent 

 or is due to the plastic and adhesive properties of the eggs them- 

 selves is still, I believe, undetermined. After from 4 to 5 days 

 the eggs turn yellowish like the yolk of a hen's egg and by the 

 sixth day a number of reddish dots appear. A day or two before 



