SPRUCE BUDWORM. 21 



tinge. About the middle of June they transform to brown 

 chrysaHds ( Fig. 6 ) inside the loosely made shelters. In a 

 week or ten days the small grayish brown moth fFig. j ) 

 emerges from the chrysalid dragging the empty case practically 

 out of the larval shelter. The moths rnay be seen on the wing 

 from the middle of June until toward the latter part of July. 

 Though the moth is prettily marked with brown and black, the 

 scales which adorn the wings are very easily rubbed off so that 

 the insect wdien caught frequently appears to be of a uniform 

 yellowish gray. Shorth' after emergence the moths deposit 

 their peculiar pale green scale like eggs in small oval patches 

 (Fig. 4) on the sides of the needles, and they are not conspicu- 

 ous. About Orono the eggs were deposited early in Ttily hatch- 

 ing in a w^eek or ten days. By July 27 nearly all ^.gg masses 

 examined were empty. It is said that the larvae feed on the 

 terminal shoots of the branches for a short time before hiber- 

 nating, and that they pass the winter as a very small caterpillar 

 in a little shelter constructed near the bud. Extended search in 

 the vicinity of Orono, by several experienced observers, and at 

 Castine, Harborside, and Seal Harbor on Mt. Desert Tsl., by 

 the writer failed to reveal a trace of the young larvae. As it 

 is certain that the young larvae do hibernate their disappearance 

 this season in these localities seemed almost inexplicable. The 

 only reasonable explanation which we have to offer is that the 

 little caterpillars immediately after emergence were eaten bv 

 small spiders whioli were very abundant upon the spruces and 

 which were seen to feed upon them on several occasions. 



DETAILED DESCRIPTIONS OF EGGS, LARVA, PUPA AND ADULT. 



Egg. (Fig. 4) Pale green, scale-like, broad, fiat, beneath, moder- 

 ately convex above, oval cylindrical, finely but irregularly granulated. 

 The shell is thin, and at first very soft. Length 0.9 to 1.4 mm.; 

 breadth 0.8 to i mm. The patches about 3 mm. in diameter, and com- 

 posed of as many as thirty eggs. The eggs overlapped each other irreg- 

 ularly, leaving about a third or fourth of the surface of each egg 

 exposed. 



"Larva, first stage. When first hatched the young caterpillar is 

 uniformly pale peagreen, with a yellowish tint. Head dark brown, but 

 the cervical shield pale amber, with two dark dots on the hinder edge; 

 hairs nearly half as long as the body is thick; length 2.5 mm. At this 



